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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A method for recovering content such as an HTML page corresponding to a URL address by a client device, includes, based on 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 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 to a server device by a one-way transmission protocol without establishment of a connection; the server device downloads the content corresponding to the URL address from the internet network; the content is transmitted to the client device by the server device via a one-way protocol with coding without acknowledgement; the content is received by the client device; and the content is recovered and stored by the client device in the cache memory.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A method for optimising an allocation of channels for broadcasting at least one first multimedia data stream, wherein a piloting component pilots the allocation among at least one first broadcasting channel delivering the first stream by a satellite broadcasting system and a second broadcasting channel delivering the first stream by a terrestrial data network, the method including: a determination of an allocation parameter including a calculation of an audience value, performed by an audience collector component; and a selection of at least one broadcasting channel as a function of the allocation parameter for the broadcasting of at least the first stream.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A method for a push server to broadcast data to terminals via an interface device, the data sent by the server passing through a distribution system enabling the data to be broadcast from the server to the device. The server transmits a stream of content data and web application data to the system; the system multicasts the stream of content data and web application data to the device; a receptor in the interface device receives the data; the data are stored in a storage device of the interface device; a local wireless connection is established between a terminal provided with a web browser and the interface device; a HTTP query is transmitted from the terminal to a web server of the interface device, the query requesting the execution of an application stored in the storage device; and the requested application is executed in the browser of the terminal.

Abstract: 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.