A method for locating a ground-based device using only one non-geostationary satellite, wherein Doppler measurements are extracted from received signals, and a plurality of computing iterations are performed, each computing iteration including defining a new geographical window having an area different from an area of a directly preceding geographical window, simulating Doppler curves for a plurality of positions inside the defined geographical window, training a machine learning model with the simulated Doppler curves associated with their position of emission, and obtaining a location of the ground-based device by inputting in the trained model the extracted Doppler measurements.
A method for the transmission to at least one non-geostationary satellite of at least one piece of data stored by a ground-based device, the method being carried out by the non-geostationary satellite and including performing periodically at least one radio coverage measurement, computing a dynamic elevation emission criterion based on the last radio coverage measurement performed, emitting at least one signal periodically towards the Earth, the signal including at least the dynamic elevation emission criterion, if the position of the non-geostationary satellite relative to the position of the ground-based device verifies the dynamic elevation emission criterion: receiving at least one signal sent by the ground-based device, the signal including at least one piece of data stored by at least one ground-based device.
A method for collecting at least one message received from at least one terminal, the method being performed on-board a satellite, includes receiving, continuously in time, a main signal over a main frequency band, sampling the received main signal, searching, in the samples of the main signal, a preamble signal emitted by the terminal, the preamble signal being included in a preamble frequency band, the preamble frequency band being included in the main frequency band, if a preamble signal has been found at the procedure of searching, storing data digital samples of at least one data signal in the memory of the satellite, the data signal being included within at least one data frequency band comprised in the main frequency band, the digital samples resulting from a sampling of the received signal within the data frequency band.
NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURWETENSCHAPPELIJK ONDERZOEK (TNO) (Netherlands)
Inventor
Le Pera, Alessandro
Finocchiaro, Daniele Vito
Dirks, Bob Petrus Franciscus
Ferrario, Ivan
Abstract
An Entangled photons distribution and measurement system includes a photon source including two outputs, able to generate a pair of entangled photons, the first photon being emitted on the first output and the second photon on the second output, a first optical link connected to the first output of the photons source, to deliver the entangled photons to a first device, an optical switch to route photons from the second output of the photons source to the first or second output of the optical switch, a second optical link connected to the first output of the optical switch, to deliver the entangled photons to a second device, and a measurement device connected to the second output of the optical switch, wherein the optical switch is configured to switch between its first and second output to switch between two operating modes.
The invention relates to a method for collecting at least one message received from at least one terminal, said method being performed on-board a satellite, comprising at least the steps of: received, continuously in time, a main signal over a main frequency band, sampling the received main signal, searching, in the samples of the main signal, a preamble signal emitted by the terminal, the preamble signal being comprised in a preamble frequency band, the preamble frequency band being comprised in the main frequency band, if a preamble signal has been found at the step of searching, storing data digital samples of at least one data signal in the memory of the satellite, the data signal being comprised within at least one data frequency band comprised in the main frequency band, the digital samples resulting from a. sampling of the received signal within the data frequency band.
Method for the compression of data collected by a LEO satellite from a plurality of IoT devices and the transmission to a base station and associated system
A compression method for the storing and transmission of a plurality of pieces of data by a non-geostationary satellite to a ground-based station, the compression method including encoding the pieces of data in a predefined frame format, the encoding including creating a frame including at least one global header including at least one parameter field, the parameter field including a reference value of a parameter, upon receiving at least one piece of data of the plurality of pieces of data, adding at least one data packet to the frame, the data packet including: a packet header including at least one delta parameter field, the delta parameter field including the difference value between the value of the parameter for the received piece of data and the reference value of the parameter of the global header, a data payload including at least part of the received piece of data.
A method for the transmission to a non-geostationary satellite of data stored by a ground-based device being carried out by the device, includes entering an awaken mode, performing successive Doppler shift estimations: receiving, by the device during the awaken mode, a signal from the satellite including a frequency parameter and an elevation emission criterion, performing a Doppler shift estimation based on the frequency of the received signal; estimating a Doppler rate of frequency change to obtain a relative position of the device, defining a transmission window during which the position of the device relative to position of the satellite verifies the elevation emission criterion, and if the position of the device relative to the position of the satellite verifies the elevation emission criterion: emitting at the frequency parameter a signal including the data stored by the device.
A method for the transmission to a non-geostationary satellite of data, each device storing data, carried out by each device, includes performing successive Doppler shift estimations including receiving, by the device, a signal from the satellite comprising at least one elevation emission criterion, performing a Doppler shift estimation based on the frequency of the received signal; estimating a Doppler rate of frequency change to obtain a position of the device relative to the position of the satellite, defining a transmission window during which the position of the device relative to position of the satellite verifies the elevation emission criterion, defining a transmission time included in the transmission window and defined randomly, emitting, at the transmission time, a signal including data stored by the device and the position of the device relative to the position of the satellite.
A method for the transmission of a region-specific piece of information from at least one non-geostationary satellite to at least one ground-based device, the method being carried out by the non-geostationary satellite and including emitting at least one signal periodically towards the Earth, the signal including the region-specific piece of information and an elevation criterion, the region-specific piece of information being specific to a region around the nadir of the non-geostationary satellite, the elevation criterion being relative to the region around the nadir of the non-geostationary satellite.
NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURWETENSCHAPPELIJK ONDERZOEK (TNO) (Netherlands)
Inventor
Le Pera, Alessandro
Finocchiaro, Daniele Vito
Dirks, Bob Petrus Franciscus
Ferrario, Ivan
Abstract
The invention relates to an Entangled photons distribution and measurement system comprising: a photon source comprising two outputs, able to generate a pair of entangled photons, the first photon being emitted on the first output and the second photon on the second output, a first optical link connected to the first output of the photons source, to deliver the entangled photons to a first device, an optical switch to route photons from the second output of the photons source to the first or second output of the optical switch, a second optical link connected to the first output of the optical switch, to deliver the entangled photons to a second device, a measurement device connected to the second output of the optical switch, wherein the optical switch is configured to switch between its first and second output to switch between two operating modes.
METHOD FOR THE COMPRESSION OF DATA COLLECTED BY A LEO SATELLITE FROM A PLURALITY OF IOT DEVICES AND THE TRANSMISSION TO A BASE STATION AND ASSOCIATED SYSTEM
The invention relates to a compression method for the storing and transmission of a plurality of pieces of data by a non-geostationary satellite to a ground-based station, the compression method comprising encoding the pieces of data in a predefined frame format, the encoding comprising: creating a frame comprising at least one global header comprising at least one parameter field, the parameter field comprising a reference value of a parameter, upon receiving at least one piece of data of the plurality of pieces of data, adding at least one data packet to the frame, the data packet comprising: A packet header comprising at least one delta parameter field, the delta parameter field comprising the difference value between the value of the parameter for the received piece of data and the reference value of the parameter of the global header, A data payload comprising at least part of the received piece of data.
The invention relates to a method for the transmission to a non-geostationary satellite of data stored by a ground-based device being carried out by the device and comprising: Entering an awaken mode, Performing successive Doppler shift estimations: Receiving, by the device during the awaken mode, a signal from the satellite comprising a frequency parameter and an elevation emission criterion, Performing a Doppler shift estimation based on the frequency of the received signal; Estimating a Doppler rate of frequency change to obtain a relative position of the device, Defining a transmission window during which the position of the device relative to position of the satellite verifies the elevation emission criterion, If the position of the device relative to the position of the satellite verifies the elevation emission criterion: Emitting at the frequency parameter a signal comprising the data stored by the device.
The invention relates to a method for the transmission to at least one non-geostationary satellite of at least one piece of data stored by a ground-based device, the method being carried out by the non-geostationary satellite and comprising the following steps: - Performing periodically at least one radio coverage measurement, - Computing a dynamic elevation emission criterion based on the last radio coverage measurement performed, - Emitting at least one signal periodically towards the Earth, the signal comprising at least the dynamic elevation emission criterion, - If the position of the non-geostationary satellite relative to the position of the ground-based device verifies the dynamic elevation emission criterion: - Receiving at least one signal sent by the ground-based device, the signal comprising at least one piece of data stored by at least one ground-based device.
The invention relates to a method for the transmission to a non-geostationary satellite of data, each device storing data, carried out by each device, the method comprising: - Performing successive Doppler shift estimations comprising: - Receiving, by the device, a signal from the satellite comprising at least one elevation emission criterion, - Performing a Doppler shift estimation based on the frequency of the received signal; - Estimating a Doppler rate of frequency change to obtain a position of the device relative to the position of the satellite, - Defining a transmission window during which the position of the device relative to position of the satellite verifies the elevation emission criterion, - Defining a transmission time comprised in the transmission window and defined randomly, - Emitting, at the transmission time, a signal comprising data stored by the device and the position of the device relative to the position of the satellite.
The invention relates to a method for the transmission of a region-specific piece of information from at least one non-geostationary satellite to at least one ground-based device, the method being carried out by the non-geostationary satellite and comprising the following step: - Emitting at least one signal periodically towards the Earth, the signal comprising the region-specific piece of information and an elevation criterion, the region-specific piece of information being specific to a region around the nadir of the non-geostationary satellite, the elevation criterion being relative to the region around the nadir of the non-geostationary satellite.
A method for aligning an earth station antenna with a satellite antenna includes sending an uplink signal from the earth station antenna to the satellite antenna; measuring at least a strength of the uplink signal received by the satellite antenna; sending by telemetry the measured signal strength to a telemetry station; adjusting the orientation of the earth station antenna in order to maximize the measured signal strength.
H01Q 3/08 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation
H04B 17/309 - Measuring or estimating channel quality parameters
G01S 3/38 - Systems for determining direction or deviation from predetermined direction using adjustment of real or effective orientation of directivity characteristic of an antenna or an antenna system to give a desired condition of signal derived from that antenna or antenna system, e.g. to give a maximum or minimum signal
A radio communications method includes carrying out, by a transmitter, transmission operations that include generating digital transmission signals carrying symbols to be transmitted and having a predefined time length; and transmitting a radio frequency signal carrying, in successive, non-overlapped time frames or slots having the predefined time length, the digital transmission signals generated. The method further includes carrying out, by a receiver, reception operations that include receiving the radio frequency signal transmitted by the transmitter; processing the received radio frequency signal to obtain a corresponding digital incoming signal; applying an oversampling operation to the digital incoming signal thereby obtaining an oversampled digital incoming signal; detecting successive, non-overlapped time frames/slots with the predefined time length in the oversampled digital incoming signal; and, for each detected time frame/slot, estimating respective symbols carried by the oversampled digital incoming signal in the time frame/slot with a predefined reception matrix incorporating a predefined Kalman filter.
A method performed on-board by a satellite for processing a signal received from a terminal during a current time interval, includes receiving, during the current time interval, a main signal containing a message from a terminal, each message having a priority level; sampling the main signal to obtain samples; storing the obtained samples into the satellite memory; first demodulating the messages corresponding to the current time interval contained in the samples stored in memory; when the satellite is in the range of a ground station, transmitting to the ground station the content of the memory. The first demodulating includes, for each message of the messages contained in the samples and by priority order: demodulating and decoding the message; forwarding, using direct link or inter-satellite-link, the demodulated message to a ground station; estimating the number of remaining non-demodulated messages in the samples stored in the memory.
H01Q 3/34 - 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 varying the phase by electrical means
A radio communications method includes carrying out, by a transmitter, transmission operations that make use of different filters for the transmission of main mode signals and twisted wave signals. The radio communications method further includes carrying out, by a receiver, reception operations. The different filters include a first transmission filter and a second transmission filter that have different filtering characteristics.
A method of generating interleaved symbols in a multiplexed data steam for a satellite broadcasting application to a plurality of receivers, includes allocating a plurality of data programs to a plurality of primary multiplexers according to a load balancing scheme; encoding in each primary multiplexer a plurality of data programs according to a coding scheme at a predefined code rate for generating encoded frames; and generating super frames in each primary multiplexer.
H03M 13/27 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes using interleaving techniques
Disclosed herein is a radio communications method including carrying out, by a transmitter, transmission operations that comprise: generating digital transmission signals carrying symbols to be transmitted and having a predefined time length; and transmitting a radio frequency signal carrying, in successive, non-overlapped time frames or slots having the predefined time length, the digital transmission signals generated. Moreover, the radio communications method further includes carrying out, by a receiver, reception operations that comprise: receiving the radio frequency signal transmitted by the transmitter; processing the received radio frequency signal so as to obtain a corresponding digital incoming signal; applying an oversampling operation to the digital incoming signal thereby obtaining an oversampled digital incoming signal; detecting successive, non-overlapped time frames/slots with the predefined time length in the oversampled digital incoming signal; and, for each detected time frame/slot, estimating respective symbols carried by the oversampled digital incoming signal in said time frame/slot by using a predefined reception matrix incorporating a predefined Kalman filter.
A method performed on-board by a satellite for processing a signal received from a terminal during a current time interval, includes receiving, during the current time interval, a main signal containing a message from a terminal, each message having a priority level; sampling the main signal to obtain samples; storing the obtained samples into the satellite memory; first demodulating the messages corresponding to the current time interval contained in the samples stored in memory; when the satellite is in the range of a ground station, transmitting to the ground station the content of the memory. The first demodulating includes, for each message of the messages contained in the samples and by priority order: demodulating and decoding the message; forwarding, using direct link or inter-satellite-link, the demodulated message to a ground station; estimating the number of remaining non-demodulated messages in the samples stored in the memory.
H01Q 3/34 - 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 varying the phase by electrical means
A method for filtering a set of contents broadcast over a satellite link includes: a first reception of a user filter by at least one piece of user equipment, the user filter including a user identifier and a first list of multimedia contents, the first list being selected from a catalogue of multimedia contents that is available on a remote data server; a second reception of a set of multimedia contents of the catalogue by at least one piece of user equipment; filtering the contents by the piece of user equipment broadcast by the satellite depending on the user filter; storing the received and filtered contents in a memory of the piece of user equipment.
H04N 7/10 - Adaptations for transmission by electrical cable
H04N 7/025 - Systems for transmission of digital non-picture data, e.g. of text during the active part of a television frame
H04N 7/173 - Analogue secrecy systemsAnalogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
H04N 21/454 - Content filtering, e.g. blocking advertisements
H04N 21/45 - Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies or resolving scheduling conflicts
H04N 21/458 - Scheduling content for creating a personalised stream, e.g. by combining a locally stored advertisement with an incoming streamUpdating operations, e.g. for OS modules
H04N 21/472 - End-user interface for requesting content, additional data or servicesEnd-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification or for manipulating displayed content
H04N 21/258 - Client or end-user data management, e.g. managing client capabilities, user preferences or demographics or processing of multiple end-users preferences to derive collaborative data
H04N 21/2668 - Creating a channel for a dedicated end-user group, e.g. by inserting targeted commercials into a video stream based on end-user profiles
H04N 21/4335 - Housekeeping operations, e.g. prioritizing content for deletion because of storage space restrictions
H04N 21/475 - End-user interface for inputting end-user data, e.g. PIN [Personal Identification Number] or preference data
The invention relates to a system and method for aligning an earth station antenna (2) with a satellite antenna (4). The method comprises the following steps: - sending an uplink signal (10) from the earth station antenna (2) to the satellite antenna (4); - measuring at least a strength of the uplink signal received by the satellite antenna (4); - sending by telemetry the measured signal strength to a telemetry station (5); - adjusting the orientation of the earth station antenna (2) in order to maximize the measured signal strength.
The method of generating interleaved symbols in a multiplexed data steam for a satellite broadcasting application to a plurality of receivers, comprises : - allocating a plurality of data programs (Pij) to a plurality of primary multiplexers (MUXi) according to a load balancing scheme; - encoding in each primary multiplexer (MXi) a plurality of data programs (Pij) according to a coding scheme at a predefined code rate for generating encoded frames (FECF); - generating super frames (SF) in each primary multiplexer (MXi) by : - performing symbols generation by applying a symbol mapping function to the previous encoded frames (FECF); - time interleaving symbols according to a convolutional interleaving scheme by: - dispersing a predefined number of symbols by considering blocks of symbols (CU), called capacity unit, into a sliding time window, the length of the time window being defined by a interleaver length; - generating at least a header for each super frame (SF) comprising at least an identifier, a synchronization indicator and the interleaving scheme; - organizing payload of the super frame (SF) by considering a predefined set of interleaved symbols; - multiplexing a set of super frames (SF) issued from a plurality of primary multiplexers (MXi) into a carrier signal.
H03M 13/03 - Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
H03M 13/29 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
H03M 13/27 - Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes using interleaving techniques
H04H 20/74 - Wireless systems of satellite networks
26.
IMPROVED RADIO COMMUNICATIONS SYSTEM AND METHOD BASED ON TIME TWISTED WAVES
Disclosed herein is radio communications method including carrying out, by a transmitter (11;21), transmission operations that comprise: generating first digital time signals related to a first Orbital Angular Momentum (OAM) mode with topological charge equal to zero, wherein each first digital time signal includes respective first time samples carrying corresponding first digital symbols to be transmitted; applying a first transmission filter (112a; 212a) to the first digital time signals, thereby obtaining filtered first digital time signals; generating second digital time signals related to one or more second OAM modes with topological charge different than zero, wherein each second digital time signal includes respective second time samples carrying one or more respective second digital symbols by means of a phase, or amplitude and phase, modulation related to a respective second OAM mode with topological charge different than zero; applying a second transmission filter (114a; 214a) to the second digital time signals, thereby obtaining filtered second digital time signals; combining the filtered first and second digital time signals into combined digital time signals, all having one and the same predefined time length; and transmitting a radio frequency signal carrying, in successive, non-overlapped time frames having the predefined time length, the combined digital time signals. The radio communications method further includes carrying out, by a receiver (12;22), reception operations that comprise: receiving the radio frequency signal transmitted by the transmitter (11;21); processing the received radio frequency signal so as to obtain a corresponding incoming digital signal; and processing said incoming digital signal so as to extract therefrom the first and second digital symbols carried thereby. The first transmission filter (112a;212a) and the second transmission filter (114a; 214a) have different filtering characteristics.
A method for generating a circular polarisation signal from at least two transponders of a satellite able to process linearly polarised signals includes: a transmission of at least two linearly polarised signal components so as to produce a circularly polarised signal by at least two transponders of a satellite; processing signals by the two transponders of the satellite to produce a circular polarisation of the signals transmitted by the satellite; ground receiving by at least one circularly polarised antenna; measuring a physical parameter from the received signals, and determining a correction parameter to be applied to the generation of the components of linearly polarised signals; generating a compensation of the components of linearly polarised signals transmitted to the satellite.
H01Q 1/28 - Adaptation for use in or on aircraft, missiles, satellites, or balloons
H01Q 21/24 - Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
H01Q 19/19 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
H04H 20/74 - Wireless systems of satellite networks
28.
Radio communications system and method with increased transmission capacity based on frequency twisted waves
A method of implementing Orbital Angular Momentum (OAM) for radio communications in general and LTE in particular. Common prior art so far recreate the vorticity (axial rotation of the Poynting vector) by using ring-shaped antenna arrays. This application proposes to create the vorticity in signal processing without the need of any space diversity (i.e. work with a single antenna). An Hilbert transform is applied in frequency domain to the Fourier transform of the analytical representation of a band-limited OFDM signal. The Hilbert transform is then approximated by a development in series into orthogonal twisted modes. This can be seen as an inverse Fourier transform of the complex analytical signal. Therefore an OAM IFFT based transmitter is proposed where parallel IFFTs are performed for each OAM mode and superimposed.
A system combining OFDM standard modulation with a superimposition of Orbital Angular Momentum modes, each OAM modes consisting in an overlapping decimated IFFTs with the main mode standard OFDM signal. Orthogonality of the OAM modes is assessed. A frame structure embodying both main mode OFDM samples and overlapping OAM modes is proposed.
H04L 5/00 - Arrangements affording multiple use of the transmission path
H04B 7/04 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
A method for establishing radiofrequency links via a satellite having several spots between a gateway and a service area comprising a plurality of elementary covering zones, designated cells, each cell being associated to a spot and including a plurality of terrestrial terminals, a forward link between the gateway towards the plurality of terrestrial terminals including a first step in which the gateway emits a first analog radiofrequency signal towards the satellite, with a first spectral efficiency; a second step in which a payload of the satellite receives the first analog radiofrequency signal; a third step in which the payload processes the first analog radiofrequency signal, and a fourth step in which the payload emits a plurality of second analog radiofrequency signals towards the cells with a second spectral efficiency, the first spectral efficiency being greater than the second spectral efficiency.
A radio communications method includes carrying out, by a transmitter: providing a digital time signal carrying digital symbols to be transmitted; and transmitting a radio frequency signal carrying the digital time signal. The method further includes carrying out, by a receiver: receiving the radio frequency signal transmitted by the transmitter; processing the received radio frequency signal to obtain a corresponding incoming digital signal; and extracting, from the incoming digital signal, the digital symbols carried by the incoming digital signal. The digital time signal carrying the digital symbols to be transmitted results from an approximation of the Hilbert transform in frequency domain, which approximation is based on a frequency main mode and one or more frequency twisted modes, wherein the frequency main and twisted modes carry, each, respective digital symbols to be transmitted.
The method for filtering a set of contents broadcast over a satellite link comprises: a first reception of a user filter (Fu) by at least one piece of user equipment (EQu), said user filter (Fu) comprising a user identifier (IDu) and a first list (L1u) of multimedia contents, the first list (L1u) being selected from a catalogue of multimedia contents (CAT) that is available on a remote data server (SERV); a second reception of a set of multimedia contents of the catalogue by at least one piece of user equipment (EQu); filtering the contents by the piece of user equipment (EQu) broadcast by the satellite depending on the user filter (Fu); storing said received and filtered contents in a memory (M) of the piece of user equipment (EQu).
H04N 21/258 - Client or end-user data management, e.g. managing client capabilities, user preferences or demographics or processing of multiple end-users preferences to derive collaborative data
H04N 21/45 - Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies or resolving scheduling conflicts
H04N 21/458 - Scheduling content for creating a personalised stream, e.g. by combining a locally stored advertisement with an incoming streamUpdating operations, e.g. for OS modules
H04N 21/472 - End-user interface for requesting content, additional data or servicesEnd-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification or for manipulating displayed content
33.
METHOD FOR OPTIMISING AN ALLOCATION OF CHANNELS FOR BROADCASTING A MULTIMEDIA STREAM
Method for optimising an allocation of channels for broadcasting at least one first multimedia data stream, characterized in that a piloting component (CP) pilots the allocation among at least one first broadcasting channel (CH1) delivering the first stream by means of a satellite broadcasting system (ST1, ANT1, SAT) and a second broadcasting channel (CH2) delivering the first stream by means of a terrestrial data network (2, 20), said method comprising: • a determination of an allocation parameter comprising a calculation of an audience value, performed by means of an audience collector component (AUD1, AUD2); • a selection of at least one broadcasting channel (CH1, CH2) as a function of the allocation parameter for the broadcasting of at least the first stream.
SATELLITE-GENERATION OF A SIGNAL OF A SECOND POLARIZATION TYPE BY MEANS OF TWO TRANSPONDERS SUITABLE FOR PROCESSING SIGNALS POLARIZED ACCORDING TO A FIRST POLARIZATION TYPE
The invention relates to a method for generating a circular polarization signal from at least two transponders of a satellite (SAT) suitable for processing linearly polarized signals, including: - transmitting at least two linearly polarized signal components (VP1, HP1) so as to produce a circularly polarized signal by means of at least two transponders of a satellite (SAT); - processing the signals by means of the two transponders (T1, T2) of the satellite (SAT) so as to produce circular polarization of the signals transmitted by the satellite (SAT); - ground-reception by means of at least one circularly polarized antenna (RHCP, LHCP); - measuring a physical parameter on the basis of the received signals and determining a correction parameter to be applied to the generation of the linearly polarized signal components (VP1, HP1); and - generating compensation of the components of the linearly polarized signals transmitted to the satellite.
A radio communications method, includes carrying out, by a transmitter: generating or receiving digital symbols to be transmitted; generating, every S digital symbols generated/received (with S integer higher than three), a corresponding multi-mode digital signal; generating a multi-frame digital signal comprising successive, non-overlapped time frames, each of which has the predefined time length and carries a respective multi-mode digital signal generated; and transmitting a radio frequency signal carrying the multi-frame digital signal. The radio communications method further includes carrying out, by a receiver: receiving the radio frequency signal transmitted by the transmitter; processing the received radio frequency signal to obtain a corresponding incoming digital signal; performing, on the basis of the incoming digital signal, carrier synchronization, clock synchronization, and frame synchronization; and extracting, on the basis of the carrier, clock and frame synchronizations.
A radio communications system includes a transmitter and a receiver. The transmitter generates or receives digital symbols having a given symbol rate associated with a corresponding symbol period; and generates, every S digital symbols generated/received (S>3), a respective multi-mode digital signal, which has a predefined time length shorter than S times the symbol period, which is sampled with a predefined sampling rate higher than the symbol rate, and which carries the S digital symbols by a plurality of orthogonal harmonic modes including a main mode which is a real harmonic mode and carries P of the S digital symbols (P
H03D 3/18 - Demodulation of angle-modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements
A process for measuring antenna gains of a transmitter for generating at least one radiation pattern of the antenna, the process including a plurality of transmissions of a test signal sent to a satellite to retransmit the test signal to a second terrestrial station, the transmissions being carried out according to different orientations, the test signal being spread spectrum modulated by a pseudo-random numerical sequence; a reception of each test signal; a demodulation of each test signal making it possible to measure the power of each test signal received; a comparison of each power with a first threshold; a generation of an encoding instruction aiming to encode a given number of sequences of data bits by at least one pseudo-random sequence.
The present invention relates essentially to a method of transmitting a plurality of data streams in the IP format from a plurality of sending stations (E1, E2) to a plurality of receiving stations (R1, R2), each data stream in the IP format comprising a destination IP address, the method comprising the various steps consisting in: - sending (210) in the uplink the plurality of data streams in the IP format from the plurality of sending stations (E1, E2) to a first telecommunication satellite (S1) operating in a first frequency band; - resending (220) in the downlink the plurality of data streams in the IP format from the first telecommunication satellite S1 to at least one satellite based telecommunication terrestrial station connected by terrestrial link to a sending station, termed the teleport (T), said at least one satellite based telecommunication terrestrial station relaying the plurality of data streams in the IP format to the teleport (T); - regrouping (230) in a multiplexer (MUX1, MUX2) the data streams in the IP format whose IP destination addresses are associated with a second telecommunication satellite (S2) operating in a second frequency band different from the first frequency band; ‑ generating (240) a multiplexed signal comprising the data streams in the IP format whose destination IP addresses are associated with the second telecommunication satellite (S2); - sending (250) in the uplink the multiplexed signal from the teleport (T) to the second telecommunication satellite (S2); - resending (260) in the downlink the multiplexed signal from the second telecommunication satellite (S2) to the plurality of receiving stations (R1, R2) by means of a transponder operating in the saturation regime.
The invention relates to a satellite multi-band antenna unit comprising a main reflector; a frequency selective reflective unit; a first feed connected to a first low noise down converter, said first feed being located in a first location for receiving radiation in a first frequency band, said radiation in the first frequency band comprising a plurality of incident beams reflected from said main reflector and transmitted through said frequency selective reflective unit; a second feed connected to a second low noise down converter, said second feed being located in a second location for receiving radiation in a second frequency band lower than said first frequency band, said radiation in the second frequency band comprising a plurality of incident beams reflected from said main reflector and from said frequency selective unit; and a transmitter connected to one of said first or second feed for transmitting uplink radiation to said main reflector. Said frequency selective reflective unit comprises at least two electrically conductive plates (30') facing each other, each plate having an array of spaced apart apertures (31 '). The spaced apart apertures (31') of each plate have inner dimensions (Ax1 increasing with an angle of the incident beams.
H01Q 15/00 - Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
H01Q 19/17 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source comprising two or more radiating elements
H01Q 19/19 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
H01Q 19/13 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
H01Q 5/45 - Imbricated or interleaved structuresCombined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device
40.
OFDM BASED ORBITAL ANGULAR MOMENTUM SYSTEM AND METHOD
Disclosed herein is a radio communications method that comprises carrying out, by a transmitter (7), the following steps: providing a digital time signal carrying digital symbols to be transmitted; and transmitting a radio frequency signal carrying said digital time signal. The method further comprises carrying out, by a receiver (8), the following steps: receiving the radio frequency signal transmitted by the transmitter (7); processing the received radio frequency signal so as to obtain a corresponding incoming digital signal; and extracting, from the incoming digital signal, the digital symbols carried by said incoming digital signal. Said digital time signal carrying the digital symbols to be transmitted results from an approximation of the Hilbert transform in frequency domain, which approximation is based on a frequency main mode and one or more frequency twisted modes, wherein said frequency main and twisted modes carry, each, respective digital symbols to be transmitted. The transmitted signal is produced by a bank of IFFT each devoted to one mode and consists in overlapped OFDM modes with growing bandwidths per modes.
Disclosed herein is a system combining OFDM standard modulation with a superimposition of Orbital Angular Momentum modes, each OAM modes consisting in an overlapping decimated IFFTs with the main mode standard OFDM signal. Orthogonality of the OAM modes is assessed. A frame structure embodying both main mode OFDM samples and overlapping OAM modes is proposed.
Disclosed herein is a method of implementing Orbital Angular Momentum (OAM) for radio communications in general and LTE in particular. Common prior art so far recreate said vorticity (axial rotation of the Poynting vector) by using ring-shaped antenna arrays. This application proposes to create said vorticity in signal processing without the need of any space diversity (ie work with a single antenna). In the present application, the main idea is to apply an Hilbert transform in frequency domain to the Fourier transform of the analytical representation of a band-limited OFDM signal. Said Hilbert transform is then approximated by a development in series into orthogonal twisted modes. This can be seen as an inverse Fourier transform of the complex analytical signal. Therefore an OAM IFFT based transmitter is proposed where parallel IFFTs are performed for each OAM mode and superimposed.
A device and method for neutralizing the effect of a jamming signal on a satellite. The device is configured to be on the ground and it includes an identification device configured to determine parameters of the jamming signal; a processor configured to generate a replica of the jamming signal; an emitter configured to broadcast the replica of the jamming signal on the uplink of the satellite.
A method for establishing radiofrequency links by satellite also making it possible to assure the return link transmission of hyperfrequency radioelectrical signals in an efficient manner in terms of performances, easily adaptable to a pre-existing broadcasting system, using the same forward link and return link frequency band, enabling the use of two independent terrestrial stations for the two channels, and enabling operation of the amplification chain of the transponder of the satellite at saturation or close to saturation.
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
H04B 1/7103 - Interference-related aspects the interference being multiple access interference
A flexible payload for a satellite includes a main uplink antenna device configured to receive at least a main uplink signal over a main coverage area; a reconfigurable uplink antenna device configured to receive a complementary uplink signal over a complementary coverage area; a command device configured to define the complementary coverage area of the reconfigurable uplink antenna device, and an agile converting device configured to generate a spectral hole in the bandwidth of the main uplink signal.
A method for detecting an unbalance of a multi-port amplifier MPA intended to be on-board a satellite is presented. The MPA includes a plurality of paths, each path being configurable in gain and phase. The method includes transmitting a first test signal which is spread spectrum modulated from the first transmitting station to the first pathway, the first test signal being generated in at least the useful band of the first pathway; receiving by the second receiving station configured in frequency to receive signals transmitted by the second antenna connected to the second path of the MPA, the signals being likely to include a replica of the first test signal; detecting and measuring a power of received signals corresponding to a replica of the first test signal having leaked at the output of the second output port; computing at least one unbalance value of the MPA from the measurement of the power of the replica of the first test signal received in the second earth station.
A device for generating Orbital Angular Momentum (OAM) modes for radio communications. The device is designed to receive one or more input digital signals, each of which has a respective sampling period which is a respective multiple of a given sampling period, and occupies a frequency bandwidth which is a respective fraction of a given available frequency bandwidth. The device is operable to apply, to each input digital signal, a respective space modulation associated with a respective OAM mode having a respective topological charge to generate a corresponding digital signal carrying the respective OAM mode. The device is configured to apply, to each input digital signal, the respective space modulation by interpolating said input digital signal and phase-modulating the interpolated input digital signal so as to generate a corresponding phase-modulated digital signal carrying the respective OAM mode, having the given sampling period, and occupying the given available frequency bandwidth.
Disclosed herein is radio communications system comprising a transmitter (4) and a receiver (5). The transmitter (4) is configured to: generate or receive digital symbols having a given symbol rate associated with a corresponding symbol period; and generate, every S digital symbols generated/received (with S>3), a respective multi-mode digital signal, which has a predefined time length shorter than S times the symbol period, which is sampled with a predefined sampling rate higher than the symbol rate, and which carries said S digital symbols by means of a plurality of orthogonal harmonic modes comprising a main mode which is a real harmonic mode and carries P of said S digital symbols (with P
Disclosed herein is a radio communications method, which comprises carrying out, by a transmitter (3), the following steps: generating or receiving digital symbols to be transmitted, said digital symbols having a given symbol rate associated with a corresponding symbol period; generating, every S digital symbols generated/received (with S integer higher than three), a corresponding multi-mode digital signal, which has a predefined time length shorter than S times the symbol period, has a predefined bandwidth larger than the Nyquist bandwidth corresponding to the given symbol rate, and carries said S digital symbols by means of orbital angular momentum modes comprising a main mode and one or more twisted modes, wherein the main mode is an orbital angular momentum mode with topological charge equal to zero and carries P of said S digital symbols (with P integer higher than zero and lower than S), and the twisted mode/ modes carries/carry the other S-P digital symbols, each twisted mode being an orbital angular momentum mode with a respective topological charge different than zero and being time-shifted with respect to the main mode; A frame structure for said multi-modes OAM signal is then proposed to accomodate the different symbol periods associated to the different modes.
A transmission/reception installation for microwave radio signals, including a unit for transmission/reception including a receiver for receiving the electric signals from the conversion of radio signals received via a terrestrial or satellite link, referred to as forward-link signals, a demodulator for demodulating the electric signals using a first modulation/demodulation protocol, a modulator for modulating electric signals using a second modulation/demodulation protocol that is different than the first protocol, the second protocol being a spread-spectrum protocol, the modulator modulating the signals demodulated by the demodulator, and a converter for converting the electric signals modulated using a spread-spectrum protocol into radio signals that can be transmitted via a satellite link. The installation also includes one or more boxes including a modulator for modulating the electric signals using the first modulation/demodulation protocol, and a coaxial cable connecting the unit for transmission/reception to the boxes.
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 data collection device carried on board a satellite and making it possible to localize a source of interference, without using neighboring satellites, comprises: a reception device able to receive the frequency on the ground of the interference; at least three antenna points arranged on the satellite so as to be able to receive a radiofrequency signal coming from the target surface; a processor able to determine the amplitude of the interference signal at the level of each of the antenna points; a connection device able to connect successively each of the antenna points to the processor.
G01S 3/18 - Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic derived directly from separate directional antennas
G01S 3/30 - Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics derived directly from separate directional systems
G01S 5/04 - Position of source determined by a plurality of spaced direction-finders
G01S 19/00 - Satellite radio beacon positioning systemsDetermining position, velocity or attitude using signals transmitted by such systems
52.
Method of geo localization of a terminal sending a single signal to a satellite system
A method for localizing a terminal includes transmitting the signal by the terminal; receiving the signal by a first and a second satellite; transmitting the signal from each satellite to a receiving station; demodulating the signal received by the first satellite to determine a signal content and the time of arrival of the signal transmitted by the terminal at the receiving station via the first satellite; determining the time of arrival of the signal transmitted by the terminal at the receiving station via the first and second satellite; determining a position for the terminal by triangulation.
G01S 19/05 - Cooperating elementsInteraction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
G01S 19/00 - Satellite radio beacon positioning systemsDetermining position, velocity or attitude using signals transmitted by such systems
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
53.
Method for locating a terminal at the surface of a coverage area by means of a telecommunication network using a multi-beam satellite
A method for locating a terminal in a coverage area using a telecommunication network, the network including a multi-beam satellite, the area including various cells, each associated with a beam for linking to the satellite to which a frequency band is assigned, the method including: performing the uplink transmission of a message incorporated into a modulated signal to the satellite at a frequency shared by three different uplink beams such that the message is received by the satellite with three different amplitudes; performing the downlink transmission of three modulated signals incorporating the message, the first, second, and third signals each corresponding to a different beam from among the three beams; receiving the first, second, and third signals; determining the amplitudes of the message within the first, second and third signals; and determining the location of the terminal from the amplitudes of the message within the first, second, and third 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
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 1/72 - Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmittersReceivers co-operating therewith using ultrasonic, sonic, or infrasonic waves
The invention relates to a method for the recovery of content such as an HTML page corresponding to a URL address by a client device, comprising the following steps: on the basis of a URL address corresponding to the content, the client device checks for the presence of the content of the URL address in a cache memory of the client device; in the absence of the content of the URL address in the cache memory, the client device creates a short message including the URL address; the message is transmitted by the client device to a server device according to a one-way transmission protocol without a given connection; the server device downloads the content corresponding to the URL address onto the internet network; the content is transmitted to the client device by the server device via a one-way protocol with coding and without acknowledgement; the content is received by the client device; and the content is recovered and stored by the client device in the memory cache.
Disclosed herein is a device (100) for generating Orbital Angular Momentum (OAM) modes for radio communications. In particular, the device (100) is designed to receive one or more input digital signals ( sm (t)), each of which has a respective sampling period ( Tm ) which is a respective multiple of a given sampling period ( T0 ), and occupies a frequency bandwidth which is a respective fraction of a given available frequency bandwidth ( W ). The device (100) is operable to apply, to each input digital signal ( sm (t)), a respective space modulation associated with a respective OAM mode having a respective topological charge (m) to generate a corresponding digital signal ( smsm (t) ) carrying said respective OAM mode. In particular, the device (100) is configured to apply, to each input digital signal ( sm (t)), the respective space modulation by interpolating said input digital signal ( sm (t)) and phase-modulating the interpolated input digital signal so as to generate a corresponding phase-modulated digital signal ( smsm (t) ) carrying said respective OAM mode, having the given sampling period ( T0 ), and occupying the given available frequency bandwidth ( W ).
The present invention relates to transmission/reception equipment (1) for microwave radio signals, comprising a transmission/reception unit (2) comprising a means (4) for receiving the electric signals from the conversion of radio signals received via a terrestrial or satellite channel, referred to as forward-channel signals, a demodulator (21) for demodulating the electric signals according to a first modulation/demodulation protocol, a modulator (5) for modulating electric signals according to a second modulation/demodulation protocol that is different than the first protocol, said second protocol being a spectral broadening protocol, said modulator (5) modulating the signals demodulated by said demodulator (21), and a means (23) for transferring said electric signals modulated according to a spectral broadening protocol into radio signals capable of being transmitted via a satellite channel. Said equipment also comprises one or more housings (11) including a modulator (14) for modulating the electric signals according to said first modulation/demodulation protocol, and a coaxial cable (10) connecting the transmission/reception unit to the housings.
A transmitting/receiving installation of microwave radio signals including a transmitting/receiving unit. The unit includes a receiving module to receive electrical signals, known as terrestrial electrical signals, issued from the transformation of radio signals received terrestrially, a module to transform the electrical signals modulated according to a spread spectrum protocol, known as satellite electrical signals, into radio signals able to be transmitted by satellite, a transmitter to transmit to a satellite of the microwave radio signals obtained after transformation of the satellite electrical signals and an amplifier to amplify the satellite electrical signals. The installation includes a box including a modulator of electrical signals according to a spread spectrum protocol and a coaxial cable connecting the transmitting/receiving unit and the box.
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
H04B 1/707 - Spread spectrum techniques using direct sequence modulation
The present invention relates to a method for locating a terminal at the surface of a coverage area by means of a telecommunication network for establishing radiofrequency connections, the network comprising a telecommunication satellite having a plurality of beams, referred to as a multi-beam satellite, said multi-beam satellite comprising a multi-beam antenna, the coverage area consisting of a plurality of cells, each cell being associated with a beam for linking to the satellite to which a frequency band is assigned, the method comprising the following steps: the terminal performing the uplink transmission of a message incorporated into a modulated signal to the satellite at a frequency shared by three different uplink beams such that the message is received by the satellite via said multi-beam antenna with three different amplitudes; said satellite performing the downlink transmission of three modulated signals incorporating the message, the first, second, and third signals each corresponding to a different beam from among said three beams; terrestrial receiving means receiving the first, second, and third signals; terrestrial calculation means determining the amplitudes of said message within said first, second and third signals; and determining the location of the terminal from the amplitudes of said message within said first, second, and third signals.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
An emission/reception installation of satellite signals including a reflector to receive and emit radio signals, a unit integrating an LNB to transform radio signals into electrical signals in a first frequency band, to amplify the electrical signals in the first frequency band and to lower the first frequency band towards a first intermediate frequency band. The unit includes an emitter to amplify electrical signals in a second intermediate band having no common frequency with the first intermediate band, to raise the second intermediate band towards a second frequency band, to transform into radio signals the electrical signals in the second frequency band and to transmit these radio signals towards the reflector. The installation includes a box including a modulator to modulate electrical signals in the second intermediate band, an output to transmit electrical signals in the first intermediate band and a coaxial cable connecting the unit and the box.
H04H 40/90 - Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups specially adapted for satellite broadcast receiving
A network for establishing RF links between a main ground station connected to a NOC center and ground terminals via a multispot satellite, the network being composed of a coverage area composed of a plurality of cells in which terminals are located, each cell being associated with at least one link spot beam with the satellite to which a frequency band is allocated, the center including a determination module to determine the transmission parameters characteristic of the position of terminals in the coverage area, the parameters covering the entire coverage area and a transmitter to transmit all parameters to each of the terminals. Each of the terminals includes a storage device to store at least part of all the parameters, a positioning device to determine its geographic position in the coverage area and a processor to determine, from the parameters and its geographic position, the transmission parameters to be utilized.
The present invention relates to a process for eliminating interference in a telecommunications network comprising a multi-beam satellite, a coverage area made up of a plurality of cells in which terminals are located, at least two of said cells, referred to as the first and second cell, being associated with the same frequency band, a first earth station consisting of a first demodulator capable of demodulating signals transmitted by terminals located in the first cell and a second earth station consisting of a second demodulator different from the first demodulator capable of demodulating signals transmitted by terminals located in the second cell. The process advantageously uses information supplied by the terminal, particularly its position and transmission parameters, and enables the appropriate G/T figure to be deduced. This information is then transmitted to the demodulator of the second earth station and will be used to reconstruct the signal incorporating the message and remove it from the received signal.
The present invention concerns an emission/reception installation (1) of satellite signals comprising a reflector (3) suited to receive and emit radio signals, a unit (2) integrating an LNB (4) suited to transform radio signals into electrical signals in a first frequency band concentrated by the reflector (3), to amplify the electrical signals in the first frequency band and to lower the first frequency band towards a first intermediate frequency band. The unit (2) further comprises an emitter (TX) suited to amplify electrical signals in a second intermediate band having no common frequency with the first intermediate band, to raise the second intermediate band towards a second frequency band (S), to transform into radio signals the electrical signals in the second frequency band and to transmit these radio signals towards the reflector (3). The installation (1) further comprises a box (21) including a modulator (25) suited to modulate electrical signals in the second intermediate band, an output (32) suited to transmit electrical signals in the first intermediate band and a coaxial cable (20) connecting the unit (2) and the box (21).
The invention concerns a system (1) for the reception of satellite data for a vehicle (2) comprising an interface housing (3) having a profiled shape such that the said interface housing (3) comprises a first part (P1) suited to be arranged on a bodywork element (9) of the vehicle (2) and a second part (P2) suited to be arranged close to a window (4) of the said vehicle (2) and a transmitter coil (5) suited to be arranged inside the vehicle (2) and to create a magnetic field (21) oscillating at a determined frequency when the said transmitter coil is supplied by an energy source (18); the housing (3) further comprises an antenna (10) suited to receive data emitted by a satellite (6) arranged in the said first part (P1) of the housing (3), means (11) for processing the data received by the antenna (10), means (16) for wireless connection to a local network (8) suited to transmit the processed data to a terminal (7) located inside the vehicle and a receiver coil (17) arranged in the second part (P2) of the housing (3) suited to resonate at the determined frequency under the effect of the magnetic field (21) created by the transmitter coil (5) such that a transfer of power is carried out from the transmitter coil (5) towards the receiver coil (17).
B60R 11/02 - Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the likeArrangement of controls thereof
The present invention relates to a payload (10), comprising: one or more antennas (A_RX) for receiving polarized radiofrequency signals (RF); a device (REP) for regenerating radiofrequency signals (RF) by filtering, frequency transposition, and amplification; and antennas (A_TX) for transmitting the regenerated radiofrequency signals (SP) to one or more terrestrial terminals (6). The invention is characterized, in terms of the outbound path, in that the radiofrequency signal regeneration device (REP) includes a plurality of regeneration channels (100), each channel consisting of an amplification device (CAMP- TWTA) capable of amplifying two radiofrequency signals having separate frequency bands and in that the transmission antennas (A_TX) associated with a regeneration chain (100) are capable of transmitting two regenerated radiofrequency signals (SP) having orthogonal polarization directions and intended for cells belonging to a single cell layout that uses at least two separate frequency bands and two separate polarizations.
The present invention relates to a payload (10), comprising: one or more antennas (A_RX) for receiving polarized radiofrequency signals (RF); a device (REP) for regenerating radiofrequency signals (RF) by filtering, frequency transposition, and amplification; and antennas (A_TX) for transmitting the regenerated radiofrequency signals (SP) to one or more terrestrial terminals (6). The invention is characterized, in terms of the outbound path, in that the regeneration device (REP) includes a plurality of regeneration channels (100), each channel including an amplification device (HPA) capable of amplifying a plurality of radiofrequency signals (RF) having separate frequency bands, and in that the transmission antennas (A_TX) are capable of transmitting regenerated radiofrequency signals (SP), via a single regeneration channel (100), to non-contiguous basic coverage areas (C), respectively, said basic coverage areas belonging to a single cellular layout that uses at least two separate frequency bands and two separate polarizations.
The present invention relates to a method for a push server (101) to broadcast data to terminals (106) via an interface device (105), said data sent by the server (101) passing through a distribution system (104) enabling the data to be broadcast from the server (101) to the device (105), the latter comprising a reception means suitable for receiving data multicast by the distribution system (104) in push mode, a means for storing said data, a web server and a connection means suitable for establishing a local wireless connection with the terminals (106). The method comprises the following steps: the server (101) transmits a stream of content data and web application data to the system (104); the system (104) multicasts the stream of content data and web application data to the device (105); the receiving means suitable for receiving in push mode receives the data; the data are stored in the storage means; a local wireless connection is established between a terminal (106) provided with a web browser and the device (105); a HTTP query is transmitted from the terminal (106) to the web server, said query requesting the execution of an application stored in the storage means; and the requested application is executed in the browser of the terminal (106).
The present invention relates to a network (100) for establishing RF links between at least one main ground station (102) connected to a NOC center (105) and ground terminals (106) via a multispot satellite (103). In addition, the network (100) is composed of a coverage area composed of a plurality of cells in which terminals (106) are located, each cell being associated with at least one link spot beam with the satellite to which a frequency band is allocated. The NOC center (105) comprises means (108) for determining the transmission parameters characteristic of the position of terminals in the coverage area, known as optimization means, the parameters covering the entire coverage area and means (107, LMA, LDA) for transmit- ting all parameters to each of said terminals (106). Each of the terminals (106) comprises means (112) for storing at least part of all the parameters, means (113) for determining its geographic position in the coverage area and means (114) for determining, from the parameters and its geographic position, the transmission parameters to be utilized.
patents
