A method for authenticating a server to a client device, the client device comprising a Physical Unclonable Function PUF, the method comprising: generating, by the client device, one or more challenge-response pairs, wherein for each pair, the challenge is obtained by computing a first function of a random number and a first readout of the PUF, and the response in the pair is obtained by computing a second function of the random number; sending the one or more challenge-response pairs to the server; receiving, by the client device, from the server: (i) a challenge from a selected one of the challenge-response pairs; and (ii) a first Message Authentication Code MAC computed by the server using the challenge and response in the selected challenge response pair; obtaining, by the client device, a second readout of the PUF; computing, by the client device, a second MAC using the challenge received from the server and the second readout of the PUF; and in the event that the second MAC matches the first MAC, authenticating the server by the client device.
A radio configured for use in a TDMA scheme, the radio being configured to transmit and receive on a plurality of frequency channels, each frequency channel having a plurality of recurring time slots, wherein: for a first one of the frequency channels, a first one of the time slots is reserved for voice communication between members of a first subnetwork; for each one of the one or more other frequency channels, a second one of the time slots is reserved for voice communication between members of a respective other subnetwork; the radio being switchable between the first frequency channel and one or more of the other frequency channel(s) to enable the user of the radio to communicate with the members of the first subnetwork on the first frequency in the first time slot, and to communicate with members of the other subnetwork(s) on their respective frequencies in the second time slot.
A method comprising: receiving a first image captured on an image sensor; obtaining a scene estimate for the first image, wherein the scene estimate comprises an estimate of the background signal for a region of space being imaged onto the sensor; storing the scene estimate in memory; receiving a plurality of successive images, wherein for each one of the successive images, the field of view is shifted with respect to the preceding image and overlaps partially with that of the preceding image; for each one of the successive images: retrieving the scene estimate from memory; subtracting the scene estimate from the image to obtain a background-subtracted image for output; updating the scene estimate based on the signal detected at the location on the image sensor to which the region of space is being imaged; and replacing the scene estimate stored in memory with the updated scene estimate.
G06T 5/50 - Image enhancement or restoration using two or more images, e.g. averaging or subtraction
G06V 10/25 - Determination of region of interest [ROI] or a volume of interest [VOI]
G06V 10/60 - Extraction of image or video features relating to illumination properties, e.g. using a reflectance or lighting model
G06V 10/75 - Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video featuresCoarse-fine approaches, e.g. multi-scale approachesImage or video pattern matchingProximity measures in feature spaces using context analysisSelection of dictionaries
G06V 10/764 - Arrangements for image or video recognition or understanding using pattern recognition or machine learning using classification, e.g. of video objects
A method for imaging a region of a moving blade of a wind turbine comprises using a wider field-of-view (WFoV) camera to capture a plurality of WFoV images of at least part of the moving blade in a field-of-view (FoV) of the WFoV camera, using the captured plurality of WFoV images of at least part of the moving blade to determine a trigger time when an edge of the moving blade is, or will be, in a triggering region, using the determined trigger time and a known spatial relationship between the triggering region and a FoV of a narrower field-of-view (NFoV) camera to calculate one or more NFoV image capture times when the edge of the moving blade, or a body of the moving blade, is, or will be, in the FoV of the NFoV camera, and using the NFoV camera to capture one or more NFoV images of the region of the moving blade at the calculated one or more NFoV image capture times. The one or more NFoV images of the region of the moving blade may be analysed to identify any damage or defects in the moving blade without any need to interrupt the motion of the blades of the wind turbine. The method may comprise sequentially scanning the FoV of the NFoV camera across a plurality of radial positions relative to an axis of rotation of the moving blades of the wind turbine and, for each radial position, imaging the corresponding regions of the moving blades of the wind turbine. The method may comprise performing the sequential scanning step and the imaging step autonomously according to a pre-programmed sequence to allow the imaging of both surfaces and both edges of each moving blade of the wind turbine.
A module for a towable sonar apparatus, comprising:
a core component, comprising at least one sensor and a first connection part;
a casing, comprising:
a tubular member provided around the core component;
a second connection part detachably connected to the first connection part of the core component.
B63B 35/44 - Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
B63B 73/50 - Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by forming methods, e.g. manufacturing of curved blocks
B63B 3/00 - Hulls characterised by their structure or component parts
B33Y 80/00 - Products made by additive manufacturing
A module for a towable sonar apparatus, comprising: a core component, comprising at least one sensor and a first connection part; a casing, comprising: a tubular member provided around the core component; a second connection part detachably connected to the first connection part of the core component.
There is provided a casing for a towable sonar apparatus, comprising:
a tubular member, wherein the tubular member comprises a foam member or a mesh member;
a first layer around the tubular member, wherein the first layer is porous.
B63B 79/10 - Monitoring properties or operating parameters of vessels in operation using sensors, e.g. pressure sensors, strain gauges or accelerometers
B63B 5/24 - Hulls characterised by their construction of non-metallic material made predominantly of plastics
A casing for a towable sonar apparatus is provided. The casing has a tubular member that includes a foam member or a mesh member. The tubular member is configured to be radially contracted and expanded between a radially contracted state and a radially expanded state. The casing also has a first layer around the tubular member, and the first layer is porous. A towable sonar apparatus, vessel, kit-of-parts, computer readable medium, and methods of manufacturing are also provided.
The present disclosure relates to a barrier component for a sonar system and a method of manufacturing a barrier component for a sonar system. At least a part of the outer surface of the barrier component comprises a repeating pattern, wherein the repeating pattern comprises surface features formed in rows, wherein the surface features have a height of less than lOpm.
A computer-implemented method comprising: receiving data to be input to a machine learning algorithm, the output from the machine learning algorithm to be used in carrying out a task; determining a degree of dissimilarity between the received data and training data that has been used to train the machine learning algorithm; determining, based on the degree of dissimilarity, whether the machine learning algorithm is likely to achieve a required level of performance when processing the received data; and in the event that it is determined that the machine learning algorithm is unlikely to reach the required level of performance, modifying the way in which the task is carried out.
A system comprising: a thermal imaging camera for detecting thermal radiation from a scene; a first calibration element and a second calibration element, wherein the first and the second calibration elements are coupled with the thermal imaging camera so as to be located or locatable in a field of view of the thermal imaging camera and configurable to be at different temperatures, in use, and at least one measuring device configured to measure the different temperatures of the first and the second calibration elements for calibrating the thermal imaging camera based on the different temperatures of the first and the second calibration elements measured by the measuring device and corresponding thermal imaging of the first and second calibration elements by the thermal imaging camera.
A computer-implemented method of determining a position of a vehicle within a transport network comprises obtaining track geometry data indicating track geometry of at least a part of the transport network; receiving first sensor data from an inertial measurement unit mounted to the vehicle; executing a Bayesian estimation filter algorithm to predict a position of the vehicle, wherein the Bayesian estimation filter algorithm comprises a process model, the process model comprising a strapdown inertial navigation algorithm, and wherein the strapdown inertial navigation algorithm generates data indicative of the predicted position of the vehicle based at least upon the first sensor data and the track geometry data such that the predicted position of the vehicle lies on a track defined by the track geometry data; receiving second sensor data from a sensor other than an inertial measurement unit, wherein the sensor is mounted to the vehicle; executing the Bayesian estimation filter algorithm to update the predicted position of the vehicle based at least upon the second sensor data; and generating an output indicative of a position of the vehicle within the transport network based upon at least one of the predicted position of the vehicle and the updated predicted position of the vehicle.
B61L 25/02 - Indicating or recording positions or identities of vehicles or trains
G01C 21/16 - NavigationNavigational instruments not provided for in groups by using measurement of speed or acceleration executed aboard the object being navigatedDead reckoning by integrating acceleration or speed, i.e. inertial navigation
13.
Method and Apparatus for Determining a Position of a Vehicle
A computer-implemented method of determining a position of a vehicle 10 within a transport network comprises: obtaining track geometry data indicating track geometry of at least a part of the transport network; determining, based upon the track geometry data, that the vehicle is approaching a junction; determining, based upon the track geometry data, a plurality of route options from the junction; generating a plurality of Bayesian estimation filter algorithms each associated with a respective one of the plurality of route options and configured to estimate a position of the vehicle based upon the track geometry data indicative of the associated route option, wherein the plurality of Bayesian estimation filter algorithms are configured to output data indicative of probabilities of the vehicle taking the associated route options; monitoring the output of the plurality of Bayesian estimation filter algorithms as the vehicle passes through the junction; and determining the route option taken by the vehicle by selecting one of the plurality of route options which presents the highest probability based upon the output of the plurality of Bayesian estimation filter algorithms.
B61L 25/02 - Indicating or recording positions or identities of vehicles or trains
G01C 21/16 - NavigationNavigational instruments not provided for in groups by using measurement of speed or acceleration executed aboard the object being navigatedDead reckoning by integrating acceleration or speed, i.e. inertial navigation
G01C 21/20 - Instruments for performing navigational calculations
14.
Systems and methods for providing connectivity between two or more hardware and software components
A computer implemented method of providing connectivity between two or more primary assets, each primary asset comprising a hardware component or a software component, the method comprising receiving a request to provide connectivity between the primary assets; accessing a repository that stores a list of assets and metadata associated with each asset; using the metadata in the repository to generate an hierarchical list of assets; rationalising the hierarchical list of assets by selecting a group of assets from the hierarchical list of assets to be used in providing connectivity between the primary assets; and generating, based on operating parameters of each asset in the group of assets, a deployment plan for the group of assets, wherein the deployment plan defines settings and/or connections to be used between the assets in the group of assets in order to provide connectivity between the two or more primary assets.
A guidance head (8) for use in directing a beam (16) of energy towards a target comprises one or more beam-steering elements (30,32) for directing a beam of energy towards a projected position on an object in a scene, one or more beam-steering element sensors (38,40), a display (26), and a processing resource (24), wherein each beam-steering element has a corresponding beam-steering configuration, each beam-steering element sensor is configured to generate an electrical signal representative of the beam-steering configuration of the corresponding beam-steering element, and the processing resource is configured to receive image data representative of the scene and cause the display to display an image of the scene that is based on the received image data and which includes an aiming mark displayed at a position in the image of the scene based at least in part on the one or more electrical signals representative of the beam-steering configuration of the one or more beam-steering elements. The guidance head may be suitable for a weapon system such as a guided missile weapon system, a directed energy weapon system, a dazzle weapon system, or may be suitable for a target designator.
G06T 7/70 - Determining position or orientation of objects or cameras
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
A head utility system (20) comprising: a headset (22) comprising: a first power or data connector (28) for connecting to an off-headset power or data system (30); and a second power or data connector (38); the head utility system further comprising: headwear (24) for wearing over the headset, the headwear comprising: a headwear power or data connector (44) for connecting to the second power or data connector; wherein the second connector and the headwear connector are arranged to be releasably connected when the headwear is worn over the headset, such that power or data can be transferred between the headset and the headwear.
A support for locating and supporting an power and/or data connector with respect to a wearable item, the support comprising: a coupling configured to be releasably attachable to a wearable item for locating the support on the wearable item during use; and a body comprising: an interface configured to support an power and/or data connector during use; wherein the support is configured, in use, to be releasably engageable with a wearable item and a power and/or data connector to locate and support the power and/or data connector with respect to the wearable item, such that the power and/or data connector is connectable with a further power and/or data connector.
Trajectory estimate for a sub-sonic projectile can be derived from sampling a wake contribution of an acoustic signal detected at a multi-detector array. The wake contribution is sampled, in time, and the samples are processed to determine a bearing estimate for the projectile from which the acoustic wake derives.
G01S 5/28 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
G01S 3/80 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic, or infrasonic waves
G01S 5/18 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
G01S 15/00 - Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
19.
METHODS AND SYSTEMS FOR VALIDATING DATA IN A DISTRIBUTED COMPUTING NETWORK
A computer-implemented method for validating data in a distributed computing network, the network comprising a plurality of nodes, the method comprising generating, by a node in the network, a ciphertext by encrypting a message using (i) a public key of a public/private key pair and (ii) data that is to be validated, transmitting, from the node that generated the ciphertext, a request to one or more other node(s) in the network to decrypt the ciphertext, the one or more other nodes being configured to decrypt the ciphertext using a token generated using (i) the private key of the public/ private key pair and (ii) information against which the data is to be validated, and determining, based on the result of decrypting the ciphertext, whether or not the data is valid.
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
H04L 29/08 - Transmission control procedure, e.g. data link level control procedure
20.
METHOD AND APPARATUS FOR DETERMINING A POSITION OF A VEHICLE
Method of determining a position of a vehicle 10 within a transport network, comprising obtaining track geometry data; receiving sensor data from an inertial measurement unit (IMU) 26 mounted to the vehicle 10; executing a Bayesian estimation filter algorithm 34 to predict a position of the vehicle, wherein the filter algorithm comprises a process model comprising a strapdown inertial navigation algorithm 47, and wherein the strapdown inertial navigation algorithm 47 generates data indicative of the predicted position of the vehicle based upon the sensor data and the track geometry data such that the predicted position of the vehicle lies on a track defined by the track geometry data; receiving second sensor data from a sensor 25,27 other than the IMU 26; executing the Bayesian estimation filter algorithm 34 to update the predicted position of the vehicle based upon the second sensor data; and generating a position of the vehicle.
G01C 21/16 - NavigationNavigational instruments not provided for in groups by using measurement of speed or acceleration executed aboard the object being navigatedDead reckoning by integrating acceleration or speed, i.e. inertial navigation
B61L 25/02 - Indicating or recording positions or identities of vehicles or trains
There is provided a computer-implemented method of determining a position of a vehicle within a transport network. The method comprises: obtaining track geometry data indicating track geometry of at least a part of the transport network; determining, based upon the track geometry data, that the vehicle is approaching a junction; determining, based upon the track geometry data, a plurality of route options from the junction; generating a plurality of Bayesian estimation filter algorithms 34 each associated with a respective one of the plurality of route options and configured to estimate a position of the vehicle based upon the track geometry data indicative of the associated route option, wherein the plurality of Bayesian estimation filter algorithms are configured to output data indicative of probabilities of the vehicle taking the associated route options; monitoring the output of the plurality of Bayesian estimation filter algorithms as the vehicle passes through the junction; and determining the route option taken by the vehicle by selecting one of the plurality of route options which presents the highest probability based upon the output of the plurality of Bayesian estimation filter algorithms.
B61L 25/02 - Indicating or recording positions or identities of vehicles or trains
G01C 21/16 - NavigationNavigational instruments not provided for in groups by using measurement of speed or acceleration executed aboard the object being navigatedDead reckoning by integrating acceleration or speed, i.e. inertial navigation
G01C 21/20 - Instruments for performing navigational calculations
A field of view detector comprising an orientation sensor for determining an orientation of the field of view detector, a location sensor for determining a location of the field of view detector, and a communication system, the field of view detector configured to communicate the orientation and location of the field of view detector to a central device using the communications system.
There is provided a computer-implemented method of determining a position of a vehicle 10 within a transport network. The method comprises obtaining track geometry data indicating track geometry of at least a part of the transport network; receiving first sensor data from an inertial measurement unit 26 mounted to the vehicle 10; executing a Bayesian estimation filter algorithm 34 to predict a position of the vehicle, wherein the Bayesian estimation filter algorithm comprises a process model, the process model comprising a strapdown inertial navigation algorithm 47, and wherein the strapdown inertial navigation algorithm 47 generates data indicative of the predicted position of the vehicle based at least upon the first sensor data and the track geometry data such that the predicted position of the vehicle lies on a track defined by the track geometry data; receiving second sensor data from a sensor 25, 27 other than an inertial measurement unit 26, wherein the sensor is mounted to the vehicle; executing the Bayesian estimation filter algorithm 34 to update the predicted position of the vehicle based at least upon the second sensor data; and generating an output indicative of a position of the vehicle within the transport network based upon at least one of the predicted position of the vehicle and the updated predicted position of the vehicle.
G01C 21/16 - NavigationNavigational instruments not provided for in groups by using measurement of speed or acceleration executed aboard the object being navigatedDead reckoning by integrating acceleration or speed, i.e. inertial navigation
There is provided a computer-implemented method of determining a position of a vehicle within a transport network. The method comprises: obtaining track geometry data indicating track geometry of at least a part of the transport network; determining, based upon the track geometry data, that the vehicle is approaching a junction; determining, based upon the track geometry data, a plurality of route options from the junction; generating a plurality of Bayesian estimation filter algorithms 34 each associated with a respective one of the plurality of route options and configured to estimate a position of the vehicle based upon the track geometry data indicative of the associated route option, wherein the plurality of Bayesian estimation filter algorithms are configured to output data indicative of probabilities of the vehicle taking the associated route options; monitoring the output of the plurality of Bayesian estimation filter algorithms as the vehicle passes through the junction; and determining the route option taken by the vehicle by selecting one of the plurality of route options which presents the highest probability based upon the output of the plurality of Bayesian estimation filter algorithms.
B61L 25/02 - Indicating or recording positions or identities of vehicles or trains
G01C 21/16 - NavigationNavigational instruments not provided for in groups by using measurement of speed or acceleration executed aboard the object being navigatedDead reckoning by integrating acceleration or speed, i.e. inertial navigation
G01C 21/20 - Instruments for performing navigational calculations
A computer-implemented method for generating a simulated environment in which the behaviour of one or more individuals is modelled, the method comprising: defining a state of the environment at a first point in time;receiving an input defining an action to be performed by one or more individuals in the simulated environment; andin response to the input, updating the state of the environment based on a social-ecological model, wherein the social-ecological model simulates the behaviour of people within the environment and how the people respond to changes associated with said action, wherein the social-ecological model is a machine learning model that is trained using data reflective of real-life past events, the social-ecological model being configured to accept as input a parameterised dataset describing the state of the environment at the first point in time and to output an updated dataset that describes the updated state of the environment.
A computer-implemented method for generating a simulated environment in which the behaviour of one or more individuals is modelled, the method comprising: defining a state of the environment at a first point in time; receiving an input defining an action to be performed by one or more individuals in the simulated environment; and in response to the input, updating the state of the environment based on a social-ecological model, wherein the social-ecological model simulates the behaviour of people within the environment and how the people respond to changes associated with said action, wherein the social-ecological model is a machine learning model that is trained using data reflective of real-life past events, the social-ecological model being configured to accept as input a parameterised dataset describing the state of the environment at the first point in time and to output an updated dataset that describes the updated state of the environment.
A computer-implemented method for generating a simulated environment in which the behaviour of one or more individuals is modelled, the method comprising: defining a state of the environment at a first point in time;receiving an input defining an action to be performed by one or more individuals in the simulated environment; andin response to the input, updating the state of the environment based on a social-ecological model, wherein the social-ecological model simulates the behaviour of people within the environment and how the people respond to changes associated with said action, wherein the social-ecological model is a machine learning model that is trained using data reflective of real-life past events, the social-ecological model being configured to accept as input a parameterised dataset describing the state of the environment at the first point in time and to output an updated dataset that describes the updated state of the environment.
Detection of a trajectory of a supersonic projectile is carried out derived from a plurality of acoustic detection signals. From these acoustic detection signals, two or more shockwave-derived trajectory estimates can be derived. Further, a wake derived trajectory bearing estimate can be derived, from which disambiguation of the shockwave-derived trajectory estimates can be effected.
G01S 3/808 - Systems for determining direction or deviation from predetermined direction using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
G01S 11/14 - Systems for determining distance or velocity not using reflection or reradiation using ultrasonic, sonic or infrasonic waves
There is provided systems and methods for mitigating interference from an interference signal. In one implementation the system comprises cancellation circuitry configured to: receive a first signal from a first antenna, the first signal comprising an interference component deriving from the interference signal and a desired component deriving from a desired signal; and receive a second signal comprising an interference component deriving from the interference signal and received at one or more of a different antenna or a different frequency to the first signal. The interference component in the second signal is stronger than that the interference component in the first signal. The cancellation circuitry is further configured to derive a cancellation signal from the second signal; generate an output signal by subtracting the cancellation signal from the input signal to substantially remove the interference component from the first signal; and output the output signal.
H04B 1/12 - Neutralising, balancing, or compensation arrangements
H01Q 3/26 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elementsArrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the distribution of energy across a radiating aperture
A safety and arming device for a munition is operable to arm and initiate a munition dependent on determining separation from a munition platform, determining detection of free fall of the device for a first time period following separation, initiating a roll manoeuvre of the munition and determining detection of the execution of the roll manoeuvre within a second time period, and generating a munition firing signal, dependent on detection of all of separation, free fall, and the roll manoeuvre.
F42C 15/00 - Arming-means in fuzesSafety means for preventing premature detonation of fuzes or charges
F42C 11/06 - Electric fuzes with time delay by electric circuitry
F42C 15/40 - Arming-means in fuzesSafety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected electrically
F42C 15/196 - Arming-means in fuzesSafety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a rotatable carrier rotatable in a plane which is parallel to the longitudinal axis of the projectile by the action of centrifugal or inertia forces on the carrier body, e.g. the carrier having eccentrically mounted weights or eccentric centre of gravity
Detection of a trajectory of a supersonic projectile is carried out derived from a plurality of acoustic detection signals. From these acoustic detection signals, two or more shockwave-derived trajectory estimates can be derived. Further, a wake derived trajectory bearing estimate can be derived, from which disambiguation of the shockwave-derived trajectory estimates can be effected.
Trajectory estimate for a sub-sonic projectile can be derived from sampling a wake contribution of an acoustic signal detected at a multi-detector array. The wake contribution is sampled, in time, and the samples are processed to determine a bearing estimate for the projectile from which the acoustic wake derives.
A computer implemented method of providing connectivity between two or more primary assets, each primary asset comprising a hardware component or a software component, the method comprising receiving a request to provide connectivity between the primary assets; accessing a repository that stores a list of assets and metadata associated with each asset; using the metadata in the repository to generate an hierarchical list of assets; rationalising the hierarchical list of assets by selecting a group of assets from the hierarchical list of assets to be used in providing connectivity between the primary assets; and generating, based on operating parameters of each asset in the group of assets, a deployment plan for the group of assets, wherein the deployment plan defines settings and/or connections to be used between the assets in the group of assets in order to provide connectivity between the two or more primary assets.
A computer implemented method of providing connectivity between two or more primary assets, each primary asset comprising a hardware component or a software component, the method comprising receiving a request to provide connectivity between the primary assets; accessing a repository that stores a list of assets and metadata associated with each asset; using the metadata in the repository to generate an hierarchical list of assets; rationalising the hierarchical list of assets by selecting a group of assets from the hierarchical list of assets to be used in providing connectivity between the primary assets; and generating, based on operating parameters of each asset in the group of assets, a deployment plan for the group of assets, wherein the deployment plan defines settings and/or connections to be used between the assets in the group of assets in order to provide connectivity between the two or more primary assets.
In accordance with embodiments of the present disclosure, a flextensional transducer for underwater operation includes a driving element and a stave. The stave is made from a material with elastic properties and has a porous structure. The porous structure is adapted to be modelled such that when in use, said porous structure of the stave is of an arbitrary alignment with respect to, for instance, the driving element, and has a degree of porosity. The degree of porosity is such that the elastic properties and vibrational frequency response of the stave can be customised with respect to its intended use.
H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
G10K 9/12 - Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
A display system is described, for placement of a display above, below or beside the normal gaze of a user, to impart simple information to the user by means of selective driving of a plurality of light emitting elements.
A head utility system (20) comprising: a headset (22) comprising: a first power or data connector (28) for connecting to an off-headset power or data system (30); and a second power or data connector (38); the head utility system further comprising: headwear (24) for wearing over the headset, the headwear comprising: a headwear power or data connector (44) for connecting to the second power or data connector; wherein the second connector and the headwear connector are arranged to be releasably connected when the headwear is worn over the headset, such that power or data can be transferred between the headset and the headwear.
APPARATUS FOR CARRYING BY A PERSON AND CONFIGURED TO PROVIDE A POWER AND/OR DATA CONNECTION TO ONE OR MORE ELECTRONIC DEVICES ALSO CARRIED BY THE PERSON
Embodiments described herein relate to an apparatus (100) for carrying by a person and configured to provide a power and/or data connection to one or more electronic devices also carried by the person, the apparatus comprising: a housing (150); a cable (114) for forming a connection between the housing and one or more of the electronic devices, the cable comprising a connector (112) for connecting to a port contained within the housing so as to allow for transfer of power and/or data between the housing and the one or more electronic devices; and a connector assembly (110) comprising a sleeve (120) in which the cable (114) is received, the sleeve being insertable into an aperture (162) in the housing, so as to connect the connector to the port; wherein the sleeve (120) comprises a first portion arranged to interface with the internal walls of the aperture when the connector is connected to the port.
A computer-implemented method for alerting a user to the presence of a fault in an electromechanical system in a railway infrastructure, the method comprising: receiving electrical usage data indicative of the value of an electrical usage parameter associated with the electromechanical system; receiving temperature data indicative of the present temperature of the electromechanical system; determining, based on a predetermined relationship between the electrical usage parameter and the temperature, whether or not the value of the electrical usage parameter is indicative of a fault in the electromechanical system and if so, issuing an alert to indicate the presence of the fault.
Methods and devices use information from the original SAR images to provide measurements that can be applied to corresponding change detection products. This produces reliable registration and alignment for the change products even when the imaging geometry is significantly changed. A method of processing synthetic aperture radar, SAR, image data comprising a plurality of frames of SAR image data for each of a plurality of image geometries; for each image geometry, applying change detection to the frames of SAR image data corresponding to that image geometry to produce a corresponding plurality of change products; selecting a plurality of said acquired frames as reference frames, one in respect of each image geometry; applying a multilook SAR process to the reference frames to produce a multilook SAR product, the multilook SAR process comprising at least one processing stage comprising measuring a property of the data contained in the reference frames and applying a transformation to the data governed by the measured property; and applying a multilook change process to the change products, the multilook change process comprising applying the same transformation as in the multilook SAR process, to the change products, to produce a multilook change product.
An electromagnet can be used to provide a controlled magnetic field, for example for the purpose of minesweeping. The electromagnet is constructed of a material which has a Curie temperature, such that the electromagnet can be stored at a temperature above the Curie temperature, but deployed below the Curie temperature in use.
B63G 7/06 - Mine-sweeping meansMeans for destroying mines of electromagnetic type
H01F 7/20 - ElectromagnetsActuators including electromagnets without armatures
H01F 1/147 - Alloys characterised by their composition
H01F 1/34 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
42.
Missile for use in a laser beam riding missile guidance system
A method for aligning a missile with a target in a laser beam riding missile guidance system, the system including a laser transmitter for generating and projecting a laser information field towards the target and an optical sight for aiming the laser beam towards the target, the method comprising: determining a point in the laser information field with which the missile is currently aligned; determining a distance of the target from the missile; determining an angular displacement between the missile's current direction of travel and the direction in which the target lies from the missile; determining, based on said distance and angular displacement, a new point in the laser information field with which the missile should be aligned to reach the target; and controlling missile guidance systems on board the missile to bring the missile into alignment with the new point in the laser information field.
A method of data transfer from a tenant to a service provider comprises encrypting the data with a public key of a key pair generated by a secure device within the service provider system. The data thus cannot be accessed by the service provider during transmission. The data is generated with a corresponding access control list, which specifies that a valid certificate must be presented in order to grant a particular use of the data once stored. The tenant can thus retain control of the use of the data even though it has been transferred out of the tenant system. A method of controlling use of data securely stored in the service provider system comprises issuing a use certificate having an expiry time to the party requesting use of the data. The use certificate must be validated before use of the stored data is granted. This enables the tenant to grant use of the stored data for a limited time period.
G06F 21/62 - Protecting access to data via a platform, e.g. using keys or access control rules
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
There is provided a method and device for producing a radar image, the device comprising a controller configured to receive a set of images of an object to be imaged taken by an optical sensor from varying positions relative to the object, receive a sequence of radar measurements of the object taken by a radar sensor from varying positions relative to the object, determine the trajectory of the radar sensor relative to the object based on the images, and form a synthetic aperture radar, hereinafter referred to as SAR, image of the object based on the images, the radar measurements and the determined trajectory.
Embodiments described herein simplify the recognition of objects in synthetic aperture radar (SAR) imagery. This may be achieved by processing the image in order to make the shadow caused by the object appear more similar to the object. Alternatively, this may be achieved by processing the image in order to make the layover caused by the object appear more similar to the object. Manipulation of the shadow caused by the object and the layover caused by the object may comprise altering the aspect ratio of the image, and in the case of manipulating the shadow caused by the image, may further comprise transforming the image by reflection or rotation. The aspect ratio of the image may be altered based on information about the image collection geometry, obtained by the SAR.
G01S 13/90 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging using synthetic aperture techniques
G01S 7/41 - Details of systems according to groups , , of systems according to group using analysis of echo signal for target characterisationTarget signatureTarget cross-section
An eyeguard for use with optical devices such as binoculars or rifle scopes. The eyeguard comprises an eyepiece defining an aperture and a first axis; a device piece for being located adjacent an optical device during use; wherein the eyepiece and device piece are configured to move relative to each other along the first axis in response to the application of a force; a driver configured to move relative to one of the eyepiece and the device piece in response to relative movement of the eyepiece and the device piece; and a leaf arranged in a plane, the plane intersecting the first axis; wherein in response to movement of the driver the leaf is configured to move within the plane between a closed arrangement, in which passage of light between the optical device and a user through the aperture is obscured, and an open arrangement, in which the passage of light between the optical device and the user through the aperture is no longer obscured.
An optical apparatus comprises an optical resonator defining an optical resonator path for an optical resonator beam and an optical beam expander optically coupled to the optical resonator, the optical beam expander defining an optical beam expander path for an optical beam expander beam. The optical resonator path and the optical beam expander path may be configured such that the optical resonator beam and the optical beam expander beam at least partially intersect. Such an optical apparatus may be configured for use as a laser target designator or a laser range finder.
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H01S 3/081 - Construction or shape of optical resonators or components thereof comprising three or more reflectors
H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
H01S 3/08 - Construction or shape of optical resonators or components thereof
H01S 3/109 - Frequency multiplication, e.g. harmonic generation
48.
Video compression with increased fidelity near horizon
A device and method for compressing image data. Image data is received comprising one or more images recorded by a camera. Attitude data is received indicating the attitude of the camera when each of the one or more images was recorded. In each of the one or more images, a region of interest is defined, the region of interest being bounded by a boundary, the boundary of the region of interest being based on the attitude data for the respective image and defining a section of the image within the region of interest and a section of the image outside the region of interest. Each of the one or more images is compressed, wherein the compression ratio applied to the section of the image outside the region of interest is higher than that applied to the section of the image within the region of interest.
H04N 19/167 - Position within a video image, e.g. region of interest [ROI]
H04N 19/17 - Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
H04N 19/625 - Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
49.
CONTROLLING EMISSION OF PASSIVE Q-SWITCHED LASER PULSES
A method for controlling emission of optical pulses from a passive Q-switched laser apparatus comprises pumping a gain medium of a passive Q-switched laser apparatus for the emission of a plurality of Q-switched optical pulses from the laser apparatus. The method may further comprise pumping the gain medium so as to maintain an optical gain provided by the gain medium above an unpumped optical gain level for the duration of a time period from emission of one Q-switched optical pulse to emission of a subsequent Q-switched optical pulse. The method may further comprise varying a rate of pumping of the gain medium between emission of the one Q-switched optical pulse and emission of the subsequent Q-switched optical pulse so as to control the temporal separation between the one Q-switched optical pulse and the subsequent Q-switched optical pulse. The gain medium may comprise a solid state gain medium. The method may comprise optically pumping the gain medium.
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
G01S 17/08 - Systems determining position data of a target for measuring distance only
H01S 3/102 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 3/113 - Q-switching using intracavity saturable absorbers
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
50.
METHODS AND SYSTEMS FOR ALERTING A USER TO THE PRESENCE OF A FAULT IN AN ELECTROMECHANICAL SYSTEM IN A RAILWAY INFRASTRUCTURE
A computer-implemented method for alerting a user to the presence of a fault in an electromechanical system in a railway infrastructure, the method comprising: receiving electrical usage data indicative of the value of an electrical usage parameter associated with the electromechanical system; receiving temperature data indicative of the present temperature of the electromechanical system; determining, based on a predetermined relationship between the electrical usage parameter and the temperature, whether or not the value of the electrical usage parameter is indicative of a fault in the electromechanical system and if so, issuing an alert to indicate the presence of the fault.
A computer-implemented method for alerting a user to the presence of a fault in an electromechanical system in a railway infrastructure, the method comprising: receiving electrical usage data indicative of the value of an electrical usage parameter associated with the electromechanical system; receiving temperature data indicative of the present temperature of the electromechanical system; determining, based on a predetermined relationship between the electrical usage parameter and the temperature, whether or not the value of the electrical usage parameter is indicative of a fault in the electromechanical system and if so, issuing an alert to indicate the presence of the fault.
G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere
B61L 23/04 - Control, warning or like safety means along the route or between vehicles or trains for monitoring the mechanical state of the route
Control of a plurality of electronically commutated motors is effected using a control unit and a power unit. The power unit enables the provision of commutation signals to each controlled motor. The control unit comprises a DSP and a FPGA. An input memory of the FPGA is mapped to the DSP. In use, the DSP determines motor repositioning signals, on the basis of a received motor position demand signal describing demanded motor positions and the encoded motor position data, and loads the motor repositioning signals into the input memory of the FPGA. The FPGA is operable to generate motor driving current signals for driving the motors into the demanded motor positions, on the basis of the motor repositioning signals and motor phase current samples collected by the power unit, and to output the motor driving current signals to the power unit.
G01M 1/38 - Combined machines or devices for both determining and correcting imbalance
G05B 13/00 - Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
A control unit is provided with a selector and a plurality of value indicators. One of the value indicators provides a coarse indication of an existing value of an adjustable control quantity. The other value indicators are in another state, distinguishable from the value indicating state. A rotary adjustor provides a manual adjustment facility for a user. Selection of the selector puts the adjustable control quantity in an adjustment mode. In this adjustment mode, rotary actuation of the rotary adjustor allows adjustment of the control quantity. A new value of the control quantity is indicated by a change in the display states of the value indicators.
G06F 3/0362 - Pointing devices displaced or positioned by the userAccessories therefor with detection of 1D translations or rotations of an operating part of the device, e.g. scroll wheels, sliders, knobs, rollers or belts
B64D 43/00 - Arrangements or adaptations of instruments
G06F 3/0484 - Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
H03J 1/04 - Indicating arrangements with optical indicating means
An acoustic detector provides a planar arrangement of microphones. A windshield is arranged over the microphones, with a view to reducing the impact of environmental effects. A void is therefore defined over the microphones, and the interior surface of the windshield, which defines the void, is shaped suitably to reduce the potential for acoustic waves propagating within the void to reflect back onto the microphones.
H04R 1/40 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
G10K 11/16 - Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
G10K 11/28 - Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors
A signal detector for detecting an information component of a passive radar detection signal, comprises a sampler operable to obtain a sample segment, in time domain, of a radar detection signal, a signal processor operable to identify a relatively high power periodic component of the sample segment signal spectrum in contrast to a relatively low power information component of the sample segment signal spectrum, and a signal rejector operable to window the detection signal with respect to the identified periodic component, to retain parts of the signal not interfered by said periodic component.
G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systemsAnalogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
G01S 7/41 - Details of systems according to groups , , of systems according to group using analysis of echo signal for target characterisationTarget signatureTarget cross-section
G01S 13/52 - Discriminating between fixed and moving objects or between objects moving at different speeds
The disclosure concerns the establishment of a network based system for executing information transactions. An identity assertion, confirmed by one computer in the network, can be distributed to other computers in the network, on the basis of trust based relationships between computers. Trust based relationships between computers can be delegated along trust pathways linking computers not in direct communication in the network.
H04L 29/06 - Communication control; Communication processing characterised by a protocol
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
A man-worn power and data harness. The harness is intended to facilitate the supply of power and data around a user's, and in particular a soldier's, person. Furthermore, the harness is intended to be compatible with a tiered structure of soldier load carriage and protection. The harness may comprise: at least one brace for passing over a user's shoulder, each brace comprising at least one cable; and a belt for at least partially encircling a user's waist, the belt comprising at least one cable;wherein each cable comprises power and/or data cabling, each brace is connected at both ends to the belt and each brace comprises at least one release clip, the release clip being for disconnecting and reconnecting the brace;each brace may further comprise at least one attachment device to attach the brace to an item worn underneath the harness. Furthermore, a harness and load carriage may be provided. Methods for the use of such a harness in combination with a tiered structure for soldier load carriage and protection may also be provided.
A photoconductive switch comprising a photoconductive material and first and second contacts provided on said photoconductive material, wherein said first and second contacts comprise a plurality of interdigitated tracks, the tracks of each contact being separated from the tracks of the other contact by a photoconductive gap, the tracks being curved such that the minimum photoconductive gap measured in a first direction remains substantially similar regardless of the orientation of the first direction.
H01L 31/09 - Devices sensitive to infrared, visible or ultra- violet radiation
H03K 17/78 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
59.
Laser diode side pumping of an elongated solid-state laser without focusing/optics
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
H01S 3/06 - Construction or shape of active medium
H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
A tool provides a means of engaging with a device embedded in a laminar element. The tool is intended to engage with fixing bores of the device which would otherwise accommodate fixing means such as bolts. The tool comprises one or more engagement members and an engagement surface. The or each engagement member projects from the engagement surface. The or each engagement member comprises a retractable pin, and a resilient collar captively engaged on the pin. Retraction of the or each pin will cause the corresponding collar to be urged against the engagement surface, which will lead to deformation of the collar and a consequent urging radially of material of the collar, relative to the pin. This radial urging outwards can be used to engage the collar against the surface defining the fixing bore, to provide an interference fit which can then be used to pull the device away from the laminar element.
B25B 9/00 - Hand-held gripping tools other than those covered by group
B25B 27/02 - Hand tools or bench devices, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
B25B 27/06 - Hand tools or bench devices, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting or withdrawing sleeves or bearing races
An acoustic detector provides a planar arrangement of microphones. A windshield is arranged over the microphones, with a view to reducing the impact of environmental effects. A void is therefore defined over the microphones, and the interior surface of the windshield, which defines the void, is shaped suitably to reduce the potential for acoustic waves propagating within the void to reflect back onto the microphones.
H04R 1/40 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
A control unit is provided with a selector and a plurality of value indicators. One of the value indicators provides a coarse indication of an existing value of an adjustable control quantity. The other value indicators are in another state, distinguishable from the value indicating state. A rotary adjustor provides a manual adjustment facility for a user. Selection of the selector puts the adjustable control quantity in an adjustment mode. In this adjustment mode, rotary actuation of the rotary adjustor allows adjustment of the control quantity. A new value of the control quantity is indicated by a change in the display states of the value indicators.
A control unit is provided with a selector and a plurality of value indicators. One of the value indicators provides a coarse indication of an existing value of an adjustable control quantity. The other value indicators are in another state, distinguishable from the value indicating state. A rotary adjustor provides a manual adjustment facility for a user. Selection of the selector puts the adjustable control quantity in an adjustment mode. In this adjustment mode, rotary actuation of the rotary adjustor allows adjustment of the control quantity. A new value of the control quantity is indicated by a change in the display states of the value indicators.
To determine two positional co-ordinates, of a point (D) within a space, a beam (10) a radiation is caused to illuminate a part of the space and is deflected cylindrically over the space, the beam being modulated in phase with the cyclical movement such that the radiation incident upon the point (D) includes enough information to identify the point. Embodiments with rotational (r, θ) and Cartesian (x, y) co-ordinate axes are disclosed.
Missile guidance involving projection of laser light to define a Laser Information Field (LIF) is augmented by interposition of information pulses, interleaved between laser emissions establishing the LIF. Information pulses encode further information for receipt by a missile, such as an angle of roll of a missile launch platform from which the LIF is emitted.
A side pumped laser comprises an elongated gain medium (10) provided between an output coupler (20) and a counter reflector(15) and a pump source(65) configured to provide radiation to the gain medium (10) along a side axis of the gain medium, wherein the laser is configured such that radiation from the pump source is directly incident on the gain medium; and the pump source is provided proximate, adjacent or in contact with the gain medium. The laser material and compositions, geometries and dimensions are designed to both maximise laser performance and to permit the use of construction techniques commonplace in the production of equipment designed for optical telecoms systems to facilitate low cost high volume and miniaturisation. The elongated gain medium (10) may have a polygonal cross-section with a non-coated side surface (55) receiving pump light emitted by a laser diode bar (65) while the other, non-emitting surfaces are coated with for example a gold coating (60) for pump light recycling and cooling of the gain medium by heat conduction. The counter reflector (15) may be provided on one facet of a passive Q-switch (30) and the output coupler (20) on a facet (50b) of the gain medium (10).
H01S 3/06 - Construction or shape of active medium
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
H01S 3/113 - Q-switching using intracavity saturable absorbers
An optical cell and systems such as lasers, optical amplifiers, interferometers, spectrometers, delay lines comprising said optical cell are described. The optical cell comprises at least one telescope and is configured such that light provided to the optical cell makes at least one transit through the telescope in both a first or forward direction and a second or reverse direction opposite to the first or forward direction before exiting from the cell. In embodiments, the telescope is a folded telescope (10), the folded telescope comprising a first retro-reflector (15), and at least one positive optically powered surface (20); and the optical cell further comprises at least one counter reflector (30), wherein the first retro-reflector and the at least one counter reflector are configured to define a cavity or chamber therebetween; at least one input (40) for allowing light to be input to the cavity; and at least one output (45) for allowing light to exit from the cavity.
A double ridge horn antenna has open sides between its mouth and a point where a transmission line is coupled to the double ridge structure, in an embodiment, the horn antenna is formed from two parts which when attached together form the double ridge structure.
An aircraft radio system comprising a plurality of radios interconnected by a digital communications network, each radio having a transceiver and a dedicated processor platform, the aircraft radio system being configured to cause the dedicated processor platforms to constitute a virtual processing environment for the aircraft radio system. There is also an aircraft radio system comprising a plurality of discrete radios interconnected by a digital communications network, each radio having a transceiver, a dedicated processor platform and a server configured to support communications over the network using PPPoE, Point to Point Protocol over Ethernet, to provide a common digital interface between an aircraft domain and the radios for plural types of communication.
G01C 23/00 - Combined instruments indicating more than one navigational value, e.g. for aircraftCombined measuring devices for measuring two or more variables of movement, e.g. distance, speed or acceleration
B64D 11/00 - Passenger or crew accommodationFlight-deck installations not otherwise provided for
A laser resonator comprising: at least one output coupler; at least one end reflector; a retroreflector; a telescope; a gain medium; wherein the telescope is a common telescope provided in a beam path between the retro reflector and both the end reflector and the output coupler.
H01S 3/08 - Construction or shape of optical resonators or components thereof
H01S 3/081 - Construction or shape of optical resonators or components thereof comprising three or more reflectors
H01S 3/106 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
H01S 3/115 - Q-switching using intracavity electro-optic devices
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
H01S 3/06 - Construction or shape of active medium
71.
METHOD AND APPARATUS FOR USE IN PASSIVE Q-SWITCHING
A method for use in controlling a passively Q-switched laser apparatus (110) comprises triggering pumping of a passively Q-switched laser apparatus at a pump trigger time, measuring an emission delay between the pump trigger time and a time of emission of a Q-switched optical pulse from the laser apparatus. The method further comprises using the measured emission delay and a target time for the emission of a further Q-switched optical pulse from the laser apparatus to determine a further pump trigger time. The method may be used for improving the timing of emission of Q-switched optical pulses and may, in particular, serve to suppress pulse-to-pulse timing jitter in particular, though not exclusively, for laser target designation. The laser comprises an end mirror (122), an active gain medium (126), a passive Q-switch (128), an output coupler (124), a beam splitter (146), a photodetector 144), the electrical signal (148) of which is evaluated by a controller (140). The controller provides information to the laser diode driver (132) which drives the laser diode (130) emitting light (136) for pumping the active gain (126). Jitter in the repetition rate of the passively Q-switched laser can be reduced by pump power control.
H01S 3/113 - Q-switching using intracavity saturable absorbers
H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
The invention relates to a pumping system (5) for pumping a gain medium of a laser, the pumping system (5) comprising a radiation source, the radiation source comprising a plurality of emitters (10a, 10b, 10c, 10d, 10e), wherein at least one of the emitters is configured to produce radiation having a different wavelength or a different band of wavelengths to at least one other of the emitters at a given temperature.
H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 5/40 - Arrangement of two or more semiconductor lasers, not provided for in groups
H01S 5/068 - Stabilisation of laser output parameters
73.
STABLE THERMAL LENS IN A Q- SWITCHED SOLID-STATE LASER BY PUMP LIGHT CONTROL
The invention relates to a pulsed laser apparatus comprising a rod- type solid-state gain medium (15) and at least one energy source for providing energy to the gain medium, wherein the apparatus is configured to selectively provide thermal compensation energy from the energy source to the gain medium when the thermal load of the gain medium and/or a pulse rate of the apparatus is below an optimum value. A transverse pumping scheme may be used with laser diode (35) pumping and being controlled by a pump diode driver (40). The resonator comprises further a HR mirror (30) and an output coupler (20) and a passive Q-switch (25). The curvature of the output coupler is chosen to realize a stable resonator for the gain medium (15) having a constant thermal lens. Between the pump pulses (60) resulting in lasing, additional pump pulses (70a-e) are provided with the laser being below threshold but keeping the thermal lens inside the gain medium constant.
H01S 3/102 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 3/08 - Construction or shape of optical resonators or components thereof
H01S 3/06 - Construction or shape of active medium
H01S 3/094 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
A thin film mirror, comprising : a mirror shell (605); a reflective film (601) stretched between forming structures (603) provided on said mirror shell and reflective film being arranged such that they form a chamber which is capable of being placed under at least partial vacuum; the mirror shell having an inner surface which forms an inner wail of said chamber, wherein the mirror shell is a moulded part where its inner surface is a controlled surface.
G02B 7/182 - Mountings, adjusting means, or light-tight connections, for optical elements for prismsMountings, adjusting means, or light-tight connections, for optical elements for mirrors for mirrors
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
G09B 9/08 - Simulators for teaching or training purposes for teaching control of vehicles or other craft for teaching control of aircraft, e.g. Link trainer
A TETRA communications system, comprising a first TETRA communication device, connected to a first communication means by means of a first data link to transport TETRA message data and control information between said first communication means and said first TETRA communication device, a second TETRA communication device connected to a second communication means by means of a second data link to transport TETRA message data and control information between said second communication means and said second TETRA communication device, wherein said first communication means and said second communication means are further operable to establish a communications link with each other over a communications network to allow said message data and control information to be transported between said first and second TETRA communication device via said first communication means and said second communication means.
The present invention relates to a method of determining the location of a mobile unit. The mobile unit includes a GNSS receiver for receiving signals from one or more earth orbiting satellites to provide one or more pseudoranges for the position of the mobile unit. The mobile unit also includes a radio transceiver for transmitting and/or receiving signals from one or more radio devices in order to determine a time offset between a clock associated with the radio transceiver and a clock associated with said one or more radio devices. The data received by the GNSS and the radio transceiver are processed by comparing the determined time offset with a clock associated with the GNSS receiver in order to resolve the pseudoranges for the position of the unit so as to determine the position of the mobile unit. The present invention overcomes the limitations of combining the position outputs of different systems such as GNSS and UWB radio devices by combining measurements to provide a position where neither system is able to provide a position on its own.
G01S 19/46 - Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
77.
METHOD OF PROCESSING A SATELLITE NAVIGATION SIGNAL
In general terms, a mechanism is described for verifying at a remote location, a geo- location determination made at a receiver, by taking advantage of elements of location signals received at that receiver not detectable or alternatively decodable by the receiver. The elements are at least detectable by verification means at the remote location and from which a location determination of receiver can be verified.
An apparatus for generating ballot data, the apparatus comprising first key generating means configured to generate a random first public key for each of a plurality of ballots, each first public key comprising a base raised to the power of a respective first exponent; second key generating means configured to generate a second public key for each of the plurality of ballots using the generated first public keys, each second public key comprising said base raised to the power of a respective second exponent, wherein the sum of the products of the first and second exponents of the first and second public keys of respective ballots is zero; encoding means configured to encode data representing voter selection options for each of the plurality of ballots as cryptograms, each cryptogram comprising: said base raised to the power of the product of the first and second exponents of the corresponding first and second public keys, said base raised to the power of a third exponent that varies in accordance with said voter selection options, and verification data to demonstrate that said third exponent corresponds to one of the voter selection options; and output means configured to output the first and second public keys and the cryptograms of the plurality of ballots, for use by one or more electronic voting terminals.
H04L 9/30 - Public key, i.e. encryption algorithm being computationally infeasible to invert and users' encryption keys not requiring secrecy
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
An aircraft radio system comprising a plurality of radios interconnected by a digital communications network, each radio having a transceiver and a dedicated processor platform, the aircraft radio system being configured to cause the dedicated processor platforms to constitute a virtual processing environment for the aircraft radio system. There is also an aircraft radio system comprising a plurality of discrete radios interconnected by a digital communications network, each radio having a transceiver, a dedicated processor platform and a server configured to support communications over the network using PPPoE, Point to Point Protocol over Ethernet, to provide a common digital interface between an aircraft domain and the radios for plural types of communication.
An aircraft radio system comprising a plurality of radios interconnected by a digital communications network, each radio having a transceiver and a dedicated processor platform, the aircraft radio system being configured to cause the dedicated processor platforms to constitute a virtual processing environment for the aircraft radio system. There is also an aircraft radio system comprising a plurality of discrete radios interconnected by a digital communications network, each radio having a transceiver, a dedicated processor platform and a server configured to support communications over the network using PPPoE, Point to Point Protocol over Ethernet, to provide a common digital interface between an aircraft domain and the radios for plural types of communication.
A computer workstation (100) for use in a shared virtual working environment, the shared virtual working environment comprising a plurality of networked computer workstations (100, 120, 140) each having one or more users, the computer workstation (100) comprising: a network interface (105) for communicating with other computer workstations in the shared virtual working environment; a display controller (106) for controlling a display to display a visual representation of the shared virtual working environment; a user interface controller (107) for receiving a user input to define a subgroup of users in the shared virtual working environment; and a subgroup controller (102) for setting up a subgroup workspace in the shared virtual working environment, the subgroup workspace being accessible only to said subgroup of users, and for enabling sharing of files or data allocated to the subgroup with other users in the subgroup.
A method of processing video comprising a succession of images of a scene to detect movement of an object in the scene, comprising storing a matrix of bytes each representing the difference in intensity of a respective pixel between temporally adjacent images, creating from those bytes a histogram of the frequency at each of a range of positive and negative values of the intensity difference, locating the limits of a central peak of the frequency distribution in the histogram so as to include in the central peak changes due to illumination change and repetitive motions in the background of the scene, determining the proportion of bytes in the remainder of the distribution that are in tails of the distribution on each side of the central peak, repeating the aforesaid process for each successive pair of temporally adjacent images, and providing an output indicative of a moving object and not indicative of illumination change or repetitive motions, in the event that that proportion meets a predetermined criterion.
A TETRA communications apparatus, comprising: a first TETRA communications device, operable to establish a first communications link in an ETSI standard TETRA direct mode or trunked mode with a respective other device or devices; a second TETRA communications device, operable to establish a second communications link in an ETSI standard TETRA direct mode or trunked mode with a respective other device or devices; a data link connecting the first and second TETRA communications devices to transport TETRA user plane message data and control information between the first and second TETRA communications devices; and control means for operating the first and second TETRA communications devices to transport said user plane message data and control information between said first and second TETRA communications devices via the data link.
A communications network comprises a plurality of communications broadcasters each operable to generate a location signal in which an authentication signal is embedded and to broadcast the location signal, and a receiver operable to receive the location signals. The receiver is operable to determine, on the basis of the location signals, geo-location information defining a geo-location of said receiver. The receiver is further operable to pass on to a third party, portions of the received signals from which the geo-location has been derived, including the embedded authentication signals. The third party can then authenticate the geo-location by reference to the authentication signals.
B60R 25/04 - Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor
G07B 15/02 - Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points taking into account a variable factor such as distance or time, e.g. for passenger transport, parking systems or car rental systems
A steerable projectile (30) comprises a body portion (32) and a nose portion (34). The nose portion and body portion are substantially coaxially arranged and rotatable relative to one another about their co-axis. The nose portion further comprises an asymmetric formation (36) operable to enable the projectile to be subjected to off-axis drag during flight.
F42B 15/10 - Missiles having a trajectory only in the air
F41G 9/00 - Systems for controlling missiles or projectiles, not provided for elsewhere
F42B 10/00 - Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missilesArrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
F42B 15/00 - Self-propelled projectiles or missiles, e.g. rocketsGuided missiles
A method and system is described for reducing unwanted noise components/interfering targets detected through an ambiguous beam-steer direction, such as the ambiguous 'back-lobe' of a sensor array. A pressure sensor array (52) and a plurality of pressure gradient sub-arrays (54 1-N) are beamformed individually at processing stages (56, 58 1-N) to derive signals indicative of directional responses, one from each group or sub-group. The signals are scaled and weighted (60, 62 0-N) and processed to define a cardioid beam with nulls pointing in the ambiguous beam-steer direction.
G01S 3/00 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
G01S 3/80 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic, or infrasonic waves
G01S 7/52 - Details of systems according to groups , , of systems according to group
G01S 3/80 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic, or infrasonic waves
G01S 3/801 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic, or infrasonic waves Details
88.
System and method for multilevel secure object management
A system and method for secure transport of data, the method comprising: sharing of key information with a key distributor, wherein the key information is for enabling decryption of first and second encrypted data, the key distributor being for making one or more decryption keys available to an authorized user; creating a container object, the container object comprising: first encrypted data having a first encryption based on at least a part of said key information; second encrypted data having a second encryption based on at least a part of said key information, wherein the first encryption is different to the second encryption; and metadata relating to the first encrypted data and the second encrypted data; and sending the container object to a data store or otherwise making the container object available, to allow user access to said data container object.
An image processing apparatus and method provides raster image data with light point enhancements. In one aspect the apparatus generates first raster data in a first geometric domain and second raster data in a second geometric domain. The apparatus transforms the first raster data from the first domain to the second domain and combines the transformed first raster data with the second raster data. In another aspect the apparatus has an attenuation unit which applies attenuation to the first raster data. The attenuation is applied dependent upon second raster data. The combination of the transformed first raster data and second raster data provides enhanced contrast, colour representation, and preserved spatial positioning of the second raster data within the background image provided by the first raster data.
A warning unit for attachment to a handheld firearm comprises an attachment device for attachment to a firearm, a light source, and a digitally manipulable input device operable to enable selection of a mode of operation. The warning unit is capable of being operated in at least a narrow divergence mode, and a wide divergence mode wherein, in the narrow divergence mode, the warning unit is operable to emit a beam of light of a lower divergence than in the wide divergence mode.
G08B 5/22 - Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmissionVisible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electromagnetic transmission
A warning unit (30) for attachment to a handheld firearm (10) comprises attachment means for attachment to a firearm, a light source, and digitally manipulable input means operable to enable selection of a mode of operation. The warning unit (30) is capable of being operated in at least a narrow divergence mode, and a wide divergence mode wherein, in the narrow divergence mode, the warning unit is operable to emit a beam of light of a lower divergence than in the wide divergence mode.
F41G 1/35 - Night sights, e.g. luminescent combined with light source, e.g. spot light for illuminating the target
G02B 27/20 - Optical systems or apparatus not provided for by any of the groups , for optical projection, e.g. combination of mirror and condenser and objective for imaging minute objects, e.g. light-pointer
F21V 14/06 - Controlling the distribution of the light emitted by adjustment of elements by movement of refractors
A fluid handling system for a dye laser (30) comprises a local dye reservoir (38) suitable for installation local to said laser, the local dye reservoir being operable to store laser dye for supply to said dye laser, and local pumping means (36) operable to draw laser dye from the local reservoir (38) at a flow suitable for use by the dye laser, and a bulk reservoir (42) operable to store laser dye, the bulk reservoir being in fluid communication with the local reservoir (38), and bulk pumping means (44) operable to cause supply of laser dye from the bulk reservoir (42) to the local reservoir (38), as the need arises.
A radio apparatus comprising: a radio frequency processing module for converting radio frequency signals from an antenna to intermediate frequency signals; an intermediate frequency processing module located remotely from the radio frequency processing module, for receiving intermediate frequency signals and processing said signals according to at least one communications protocol; and a digital data link for connecting the radio frequency processing module and the intermediate frequency processing module, for transfer of the intermediate frequency signals.
H04B 1/00 - Details of transmission systems, not covered by a single one of groups Details of transmission systems not characterised by the medium used for transmission
A beam-riding missile (10) has a freely rotating control portion (11) forming its nose and carrying a pair of fixed ailerons (13) and a pair of fixed elevators (14). Detecting means (not shown) gather information indicative of the location of the missile in the beam and steering logic circuitry (not shown) provides signals to a clutch (18) which interfers with the free rotation of the nose in such a way that the elevators are effective to maintain the chosen flight path.
The clutch can be electromagnetic, piezo-electric or function on the Johnson-Raebeck effect.
The combination of fixed control surfaces and steering by a single actuator leads to the possibility of useful reductions in the size, weight and complexity of the missile.
A strip-map Synthetic Aperture Radar (SAR) auto-focus image generation process is provided. Batches of raw radar return data are processed in order to form batch images which each have a valid region between invalid regions. The process determines an estimate of the first derivative of a phase error at an end of the valid region, determines a time-shift corresponding to that estimate and uses that information in determining a starting point for the next batch of raw radar return data.
G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systemsAnalogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
An assembly comprising a first printed circuit board, PCB, with a ball grid array, BGA, on its underside, a second PCB facing the first PCB and having at least one through-hole between its top and bottom surfaces, its top surface printed with a circuit pattern bonded to the BGA, a heat sink layer facing the bottom surface of the second PCB and having at least one thermally-conductive pin projecting normally into the through-hole or a respective one of the through-holes in the second PCB, and, for each pin, a thermally-conductive stud of the same cross-section as the pin, bonded to the BGA and disposed within the through-hole between the pin and the first PCB in thermal contact with the pin.
An infrared detector comprising a plurality of detector elements, the plurality of detector elements comprising a plurality of differently polarisation-sensitive detector elements and a plurality of differently wavelength-sensitive detector elements.
A method of analyzing return signals of successive range cells in a scene using constant false alarm rate adaptive control comprising, for each successive range cell in turn is disclosed mathematically. The return signal is processed mathematically and averaged over a predetermined number of cells near that cell. A first variable factor and the return signal for that cell, to derive a first result. The first variable is adapted depending upon that first result. A second variable factor is derived in accordance with a predetermined relationship between the first and second factors are mathematically processed. The second factor is mathematically processed. The second averaged return signal and the return signal for the cell, to derive a second result. The second result is used as an indication of the presence of an object of interest in the scene.
G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systemsAnalogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
99.
Method and system for acoustic imaging using a plurality of transmitting arrays on a circumferential surface
The invention relates to an imaging method and system for providing acoustic images of a surface and more particularly, but not exclusively, to acoustic imaging of a surface within a confined space. Also described are an acoustic probe and a transmit/receive sensor array configuration to implement the imaging method and system. The probe has an array of acoustic transmitters arranged in juxtaposed or spaced relationship around at least a portion of the circumferential surface of the probe, and an array of acoustic receivers also disposed around at least a portion of its circumferential surface. A beam-former is used for focussing and steering the acoustic beams from the acoustic transmitter array onto portions of the structure to be examined and for focussing and steering the receive beams onto said surface portions, said beam-former adapted to cause the acoustic transmit beams to be focussed in a plane orthogonal to the plane used to focus the receive beams. High resolution in the near field can be achieved by focussing the transmit and receive beams onto a surface at a focus region, the focus region being narrow in both the orthogonal planes.
A steerable projectile (30) comprises a body portion (32) and a nose portion (34). The nose portion and body portion are substantially coaxially arranged and rotatable relative to one another about their co-axis. The nose portion further comprises an asymmetric formation (36) operable to enable the projectile to be subjected to off -axis drag during flight.
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