AB STRACT An imaging lens system for tracking a celestial body includes, sequentially in a direction from the object side to the image side: a first lens group including, sequentially in the foregoing direction, either a negative-dioptric-power and two positive-dioptric-power lens elements, or a positive-dioptric-power, a negative-dioptric-power, and another positive-dioptric-power lens element; a second lens group including two negative-dioptric-power lens elements; and a third lens group including, sequentially in the foregoing direction, either a positive-dioptric-power, a negative-dioptric-power, and another positive-dioptric-power lens element, or two positive-dioptric-power, a negative-dioptric-power, and another positive-dioptric-power lens element. An aperture stop is located at the center of the imaging lens system symmetrically, allowing marginal rays to pass through the center of each lens element. The positive- and negative-dioptric-power lens elements contribute to a balanced field curvature. A wide system aperture (f/1.4) and a relatively wide field of view)(FOV<28°) result from the characteristic of an inverted telephoto configuration.
G02B 9/14 - Objectifs optiques caractérisés à la fois par le nombre de leurs composants et la façon dont ceux-ci sont disposés selon leur signe, c.-à-d. + ou — ayant uniquement trois composants disposés + — +
2.
Time delay integration sensor handling defect pixels
The present disclosure provides a time delay integration (TDI) sensor using a rolling shutter. The TDI sensor includes multiple pixel columns. Each pixel column includes multiple pixels arranged in an along-track direction, wherein two adjacent pixels or two adjacent pixel groups in every pixel column have a separation space therebetween. The separation space is equal to a pixel height multiplied by a time ratio of a line time difference of the rolling shutter and a frame period, or equal to a summation of at least one pixel height and a multiplication of the pixel height by the time ratio of the line time difference and the frame period. The TDI sensor further records defect pixels of a pixel array such that in integrating pixel data to integrators, the pixel data associated with the defect pixels is not integrated into corresponding integrators.
The present disclosure provides a time delay integration (TDI) sensor using a rolling shutter. The TDI sensor includes multiple pixel columns. Each pixel column includes multiple pixels arranged in an along-track direction, wherein two adjacent pixels or two adjacent pixel groups in every pixel column have a separation space therebetween. The separation space is equal to a pixel height multiplied by a time ratio of a line time difference of the rolling shutter and a frame period, or equal to a summation of at least one pixel height and a multiplication of the pixel height by the time ratio of the line time difference and the frame period. The TDI sensor further generates pixel data amplified by different gains for a processor to perform the image combination.
The present disclosure provides a time delay integration (TDI) sensor using a rolling shutter. The TDI sensor includes multiple pixel columns. Each pixel column includes multiple pixels arranged in an along-track direction, wherein two adjacent pixels or two adjacent pixel groups in every pixel column have a separation space therebetween. The separation space is equal to a pixel height multiplied by a time ratio of a line time difference of the rolling shutter and a frame period, or equal to a summation of at least one pixel height and a multiplication of the pixel height by the time ratio of the line time difference and the frame period. The TDI sensor further records defect pixels of a pixel array such that in integrating pixel data to integrators, the pixel data associated with the defect pixels is not integrated into corresponding integrators.
A vacuum cathode arc-induced pulsed thruster includes a housing where a triggering room and an electric discharging room are defined and are in communication with each other, a first anode unit and a first cathode unit concentrically disposed in the triggering room, a second anode unit disposed in the electric discharging room, an insulating fuel layer concentrically located between the first anode unit and the first cathode unit, a main insulating layer concentrically surrounded by the first cathode unit, and a second cathode unit inserted from the triggering room into the electric discharging room. Thus, the vacuum cathode arc-induced pulse thruster is lightweight and has low manufacturing costs, low system complexity, and less energy consumption. Carbon deposition caused during an electric discharging process is prevented from affecting an inducing effect to thereby prolong the service life of the thruster and increase the control precision and inducing precision effectively.
The present invention is directed to an adjustable optical element supporting structure comprising a first structure group, a second structure group, a third structure group and a fourth structure group. The second structure group is disposed on the first structure group, the third structure group is disposed on the second structure group, and the fourth structure group is disposed on the third structure group. Each of the first structure group, the second structure group and the third structure group includes a supporting beam and a node assemble, and the position of the node assemble can be adjusted along a radial or a tangential direction. The fourth structure group is a supporting member having three branches, and a supporting pad made by an elastic material is disposed on the supporting member for supporting an optical element. Accordingly, the present invention can evenly support the optical element having different sizes and structures.
G02B 27/00 - Systèmes ou appareils optiques non prévus dans aucun des groupes ,
G02B 7/02 - Montures, moyens de réglage ou raccords étanches à la lumière pour éléments optiques pour lentilles
G02B 7/183 - Montures, moyens de réglage ou raccords étanches à la lumière pour éléments optiques pour prismesMontures, moyens de réglage ou raccords étanches à la lumière pour éléments optiques pour miroirs pour miroirs spécialement adaptés à de très grands miroirs, p. ex. pour l'astronomie
7.
Auto-focus method for a remote sensing satellite and the satellite therefor
Auto-focus method and a remote sensing satellite are disclosed. The satellite comprises at least a focal plane assembly (FPA) and a focus adjusting apparatus, the auto-focus method comprises: processing a point spread function (PSF) estimation to a multiple regions of a first image to generate multiple first estimated point spread functions; generating a first average point spread function according to the first estimated point spread functions; processing a Gaussian curve fitting to the first average PSF function and defining a first focus number; processing a PSF estimation to multiple regions of a second image to generate multiple second estimated PSF functions; generating a second average point spread function according to the second estimated point spread functions; processing a Gaussian curve fitting to the second average point spread function and defining a second focus number; and comparing the first focus number and the second focus number.
A catadioptric optical system in sequence of ray tracing comprises a first mirrors group of Ritchey-Chrétien type hyperbolic mirrors with positive diopter including a concave primary mirror having a central through hole and a convex secondary mirror, a second corrector lens group with negative diopter positioned at the image-side of the first mirrors group including a first meniscus lens element having positive refractive power and a convex object-side surface, a second lens element having negative refractive power and biconcave surfaces, a third meniscus lens element having negative refractive power and a concave object-side surface, and a fourth lens element having positive refractive power and biconvex surfaces. The infinite conjugate beams of incident light within field of view pass through the catadioptric optical system to become a corrected beam having a small CRA angle.
Provided are an earth satellite attitude data fusion system and method, applicable to an earth satellite space environment to estimate attitude data of a satellite. When the earth satellite attitude data fusion system of the present invention is used to perform the earth satellite attitude data fusion method, the first step is to perform a body rates/quaternion attitude data processing operation. Then, the next step is to perform an attitude/rates data fusion processing operation, wherein an attitude data fusion algorithm module receives a first IAE result data from a first EKF, and a second IAE result data from a second EKF, and performs an attitude/rates data fusion algorithm in a subsystem level to evaluate an attitude estimation IAE performance based on the first IAE result data, and the second IAE result data.
G01C 21/02 - NavigationInstruments de navigation non prévus dans les groupes par des moyens astronomiques
G01P 15/18 - Mesure de l'accélérationMesure de la décélérationMesure des chocs, c.-à-d. d'une variation brusque de l'accélération dans plusieurs dimensions
Disclosures of the present invention describe a moving object detection system and method, wherein a pre-processer module, a feature extraction module, an image optical flow estimation module, a feature points grouping module, and a moving object determination module are provided in a controlling and processing module of the system by a form of library, variables, or operands. Moreover, a feature difference calculation unit, a matrix establishing unit and a corner feature point acquiring unit are provided in the feature extraction module, and that is helpful for enhancing computing speed of the controlling and processing device in verifying corner feature points from image frames. Therefore, after the corner feature points are applied with a cluster labeling process, the moving object determination module can achieve motion detection of at least one object locating in a monitoring area by determining whether corner feature point groups move or not.
G06T 7/246 - Analyse du mouvement utilisant des procédés basés sur les caractéristiques, p. ex. le suivi des coins ou des segments
G06T 7/194 - DécoupageDétection de bords impliquant une segmentation premier plan-arrière-plan
G06K 9/00 - Méthodes ou dispositions pour la lecture ou la reconnaissance de caractères imprimés ou écrits ou pour la reconnaissance de formes, p.ex. d'empreintes digitales
G06K 9/46 - Extraction d'éléments ou de caractéristiques de l'image
11.
Satellite attitude data fusion system and method thereof
A satellite attitude data fusion system and method is disclosed, applicable to the earth satellite environment to estimate attitude data of the satellite. When the satellite attitude data fusion system of the present invention is used to perform the satellite attitude data fusion method, the first step is to perform a body rates quaternion attitude data processing operation. Then, the next step is to perform an attitude/rates data fusion processing operation, wherein an attitude data fusion algorithm module receives the first IAE result data from the first EKF, and the second JAE result data from the second EKF, and performs an attitude/rates data fusion algorithm in a subsystem level to evaluate an attitude estimation JAE performance.
B64G 1/24 - Appareils de guidage ou de commande, p. ex. de commande d'assiette
B64G 1/36 - Appareils de guidage ou de commande, p. ex. de commande d'assiette par des capteurs, p. ex. par des capteurs solaires, des capteurs d'horizon
B64G 1/28 - Appareils de guidage ou de commande, p. ex. de commande d'assiette par inertie ou par effet gyroscopique
B64G 1/10 - Satellites artificielsSystèmes de tels satellitesVéhicules interplanétaires
G01C 21/02 - NavigationInstruments de navigation non prévus dans les groupes par des moyens astronomiques
12.
Guidance seeking device for a satellite and method for enhancing the performance of the same
A guidance seeking device for a satellite and a method of enhancing the performance of the same. The device includes a seeking device, at least one image-capturing device and a processing device. The seeking device and the at least one image-capturing device are for capturing an image to produce an image data. The processing device is configured to analyze the image data to determine a target and/or an obstacle therein, to produce an image-capturing path according to the target and/or the obstacle in the image data, and to produce a control signal to control the at least one image-capturing device to capture an image corresponding to one part of the image-capturing path. The method includes a seeking step, an analyzing step, a determination step and a controlling step.
G06K 9/00 - Méthodes ou dispositions pour la lecture ou la reconnaissance de caractères imprimés ou écrits ou pour la reconnaissance de formes, p.ex. d'empreintes digitales
G05D 1/00 - Commande de la position, du cap, de l'altitude ou de l'attitude des véhicules terrestres, aquatiques, aériens ou spatiaux, p. ex. utilisant des pilotes automatiques
G06K 9/46 - Extraction d'éléments ou de caractéristiques de l'image
A robust broadband ASE (amplified spontaneous emission) fiber light source device outputs a light beam which is little affected by temperature and radiation. The light source device is a single-pass backward or double-pass backward architecture, and has a coolerless pump laser and temperature compensated bandpass reflector. The light source device may have a high pass filtering element disposed between the wavelength division multiplexer thereof and the optical isolator thereof, so as to compensate the effect of the temperature to the mean wavelength of the light beam. The specific band of the temperature compensated bandpass reflector which reflects the light beam, and the band which the high pass filtering element transmits the light beam are within the band which the ASE unit amplifies the light beam, and the high pass filtering element mainly absorbs the light beam outside the specific band.
G02B 6/00 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage
H01S 3/094 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente
H01S 3/0941 - Procédés ou appareils pour l'excitation, p. ex. pompage utilisant le pompage optique par de la lumière cohérente produite par un laser à semi-conducteur, p. ex. par une diode laser
H01S 3/00 - Lasers, c.-à-d. dispositifs utilisant l'émission stimulée de rayonnement électromagnétique dans la gamme de l’infrarouge, du visible ou de l’ultraviolet
The present invention discloses a dual-vortical-flow hybrid rocket engine, including a main body and a nozzle communicating with an end of the main body. The main body includes a plurality of disk-like combustion chambers arranged longitudinally, and a central combustion chamber formed along the axial portion and communicating the disk-like combustion chambers. Each of the disk-like combustion chambers is provided with a plurality of oxidizer injection nozzles at its inner circumference surface. Inside the disk-like combustion chambers, the oxidizer is injected in nearly the tangent directions of the circumference, and the injection directions are opposite for the neighboring disk-like combustion chambers, which creates vortical flows with opposite rotating directions so as to increase the total residence time of the combustion reactions of the oxidizer and the solid-state fuel in the disk-like combustion chambers of the present invention.
F02K 9/72 - Moteurs-fusées, c.-à-d. ensembles fonctionnels portant à la fois le combustible et son oxydantLeur commande utilisant des propergols liquides et solides, c.-à-d. ensembles fonctionnels de moteurs-fusées hybrides
15.
Practical silicon photonic multi-function integrated-optic chip for fiber sensor applications
3, waveguide chip. The disclosed silicon-based multi-function integrated-optic chip comprises a unique design and fabrication features onto it. A unique polarization-diversity coupler is designed and fabricated to couple the external light into the silicon waveguide structure. A unique two-step (vertical and lateral) taper waveguide region is designed and fabricated to bridge the polarization-diversity coupler output with the input of a multi-mode interferometer (MMI) splitter for power loss reduction. At either end of the Y-junction output, there is a phase modulator to achieve optical phase modulation through various physics mechanisms. With this newly-developed silicon-based multi-function integrated optic chip, the size and cost of fiber sensors including FOG's can be greatly reduced.
G02B 6/28 - Moyens de couplage optique ayant des bus de données, c.-à-d. plusieurs guides d'ondes interconnectés et assurant un système bidirectionnel par nature en mélangeant et divisant les signaux
G02B 6/10 - Guides de lumièreDétails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p. ex. des moyens de couplage du type guide d'ondes optiques
16.
Shorter wavelength photo-annealing apparatus for rare-earth-doped fiber and its optical assemblies under irradiation
An optical fiber apparatus is suitable to operate under irradiation, more particularly to mitigating the damage of a rare-earth-doped optical fiber element as part of an optical fiber assembly causes by irradiation. The irradiation mitigation attributes to a photo-annealing apparatus including at least a shorter wavelength photo-annealing spectral content, which is relative to that of a pump light source, for effectively photo-annealing the rare-earth-doped fiber element. Photo-annealing by such shorter wavelength light results in a fast and nearly complete recovery of radiation induced attenuation of the rare-earth-doped optical fiber element in the wavelength range from 900 nm to 1700 nm.
A method for acquiring a code phase shift between an input sequence and a reference sequence is provided. The method is to be implemented using an acquisition device that includes a mapping unit configured to transform the input sequence and the reference sequence respectively into an input signal and a reference signal each with a complex phase, a comparison unit configured to compare the input signal with the reference signal so as to obtain a phase coherent indicator, and calculating unit configured to obtain the code phase shift between the input sequence and the reference sequence based on a phase of the phase coherent indicator and a number of bits of the input sequence.
H04B 1/00 - Détails des systèmes de transmission, non couverts par l'un des groupes Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission
3, waveguide chip. The disclosed silicon-based multi-function integrated-optic chip comprises of unique design and fabrication features onto it. First, a unique polarization-diversity coupler is designed and fabricated to couple the external light into the silicon waveguide structure. Then TE mode is guided into a silicon slab waveguide, but TM mode is confined and diverted 90 degree in a silicon carbide structure till the chip edges for TM-mode suppression. Second, a unique two-step (vertical and lateral) taper waveguide region is designed and fabricated to bridge the polarization-diversity coupler output with the input of a multi-mode interferometer (MMI) splitter for power loss reduction. In this configuration, MMI may be a 1×2 or 2×2 structure to divide the input TE mode into a 50/50 splitting ratio output to form a Y-junction. Third, at either end of the Y-junction output, there is a phase modulator to achieve optical phase modulation through various physics mechanisms such as plasma dispersion, electro-optics, thermo-optics, or photo-elastic effect. With this newly-developed silicon-based multi-function integrated optic chip, the size and cost of fiber sensors including FOG's can be greatly reduced.
This invention revealed and demonstrated a method of measuring and deriving a Jones Matrix of a fiber or fiber component, and to compensate the fiber or fiber component such that the fiber or fiber component plus the compensated optical circuit act as if an Unitary Matrix free space condition. In this way, all compensated fibers or fiber components act the same no matter what their original conditions are. It greatly enhances the fiber or fiber component repeatability and stability throughout the fiber or fiber component production line. The compensated circuit for Unitary Matrix can be applied externally or internally.
G01J 4/00 - Mesure de la polarisation de la lumière
G01J 4/04 - Polarimètres utilisant des moyens de détection électriques
G02B 6/27 - Moyens de couplage optique avec des moyens de sélection et de réglage de la polarisation
G01C 19/72 - Gyromètres utilisant l'effet Sagnac, c.-à-d. des décalages induits par rotation de faisceaux électromagnétiques dans des directions opposées à faisceaux lumineux tournant dans des directions opposées dans un anneau passif, p. ex. gyromètres à laser à fibre optique
20.
Shorter wavelength photo-annealing apparatus for rare-earth-doped fiber and its optical assemblies under irradiation
An optical fiber apparatus is suitable to operate under irradiation, more particularly to mitigating the damage of a rare-earth-doped optical fiber element as part of an optical fiber assembly causes by irradiation. The irradiation mitigation attributes to a photo-annealing apparatus including at least a shorter wavelength photo-annealing spectral content, which is relative to that of a pump light source, for effectively photo-annealing the rare-earth-doped fiber element. Photo-annealing by such shorter wavelength light results in a fast and nearly complete recovery of radiation induced attenuation of the rare-earth-doped optical fiber element in the wavelength range from 900 nm to 1700 nm.
The present invention provides a motor including a combustion chamber, an oxidizer injector, a vortex generators and a nozzle. The combustion chamber can be used to dispose a solid fuel, and the oxidizer injector is used to control the flow rate of an oxidizer and to inject the oxidizer into the combustion chamber. The vortex generators is disposed on the inner wall of the combustion chamber for generating eddies to enhance the mixing of the fuel and the oxidizer. Additionally, the nozzle is connected with the combustion chamber for exhausting the gas generated by the combustion of the propellants.
F02K 7/10 - Ensembles fonctionnels dans lesquels le fluide de travail est utilisé uniquement sous forme de jet, c.-à-d. ensembles ne comportant ni turbine ni autre moteur entraînant un compresseur ou une soufflante carénéeLeur commande caractérisés par une compression dans un diffuseur, c.-à-d. tubulures aéro-thermodynamiques ou statoréacteurs
22.
Wireless communication method, information access method, and virtual antenna radiation pattern forming method
A wireless communication method for transmitting information to the designated region with the boundary defined by the sharp cutoff is provided. Receivers outside the designated region are excluded from retrieving the encoded information. The boundary of designated region is adjustable. The wireless communication method can be applied to clearly defining the accepted region and rejection region in satellite communications. The wireless communication method includes steps of providing an information; encoding the information into an encoded data regarding a designated bit-energy-to-noise-ratio; transmitting the encoded data to form a virtual antenna radiation pattern covering a designated region with boundary defined by the sharp cutoff based on the designated bit-energy-to-noise-ratio; receiving the encoded data; and decoding the encoded data into the original information only when receivers within the designated region with bit-energy-to-noise-ratio no less than the designated bit-energy-to-noise-ratio. The critical feature of the method is clarified by experiments on the communication satellite ST-1.
A high-accuracy and computational efficient phase-discriminating device is provided and includes a phase-discriminating unit. The phase-discriminating unit converts an input and a reference signals into an input and a reference sequences respectively by a one-bit A/D conversion operation, determines a first value, an in-phase component and a quadrature component of the input signal in response to the input and the reference sequences, and produces an estimated phase of the input signal according to a relation among the first value, the in-phase component and a polarity of the quadrature component, wherein the first value is a certain integer being one of a first integer and a second integer, the first integer is a sampling count of the one-bit A/D conversion operation for producing the input sequence, and the second integer is a summation of an absolute value of the in-phase component and that of the quadrature component.
brevets