Eutelsat S a

Nederlandse Organisatie Voor Toegepast-natuurwetenschappelijk Onderzoek Tno

Alessandro Le Pera

Daniele Vito Finocchiaro

Antonio Arcidiacono

Hector Fenech

Sonya Amos

Fritz Schurig

Ivan Ferrario

Bob Petrus Franciscus Dirks

Jean-Paul Courson

Laurent Roux

Yan Brand

Daniele Vito Finocchario

Frédéric Piro

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.

Quantum key distribution systems and associated methods

A communication device for transmitting a plurality of wanted signals to a satellite from a transmitter, each of the wanted signals transmitted by the device being for being addressed to a given transmitting spot, the device including a set of reference values of powers and phases of at least a first reference signal received at different points of at least one transmitting spot, a first wanted signal generating an interfering signal in a neighbouring spot, the transmitter generating at least one wanted neighbouring signal in a neighbouring spot of the first spot, the transmitter generating a first correcting signal from the first signal transmitted and at least a first phase value and a first power value of a set of reference values, the transmitter transmitting a combination of the correcting signal and of the neighbouring signal in order to generate a corrected neighbouring signal.

Communication device for processing interference between signals transmitted in neighbouring transmitting spots, method associated therewith

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.

Method of generating circularly polarised signals from a polarisation controller of a ground station

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.

Method of geo localization of a terminal sending a single signal to a satellite system

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.

Method for establishing radiofrequency links in a telecommunication network with an optimised ground gateway network

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.

Data collection device and method for the localisation of a source of interference

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.

Method for detecting an unbalance and for calibrating a multi-port amplifier of a telecommunications satellite

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.

Process for generating a mapping of the transmission or reception coverage of an antenna of a ground station for satellite links

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.

Method for establishing radiofrequency links

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.

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Issy-les-Moulineaux, France

Alessandro Le Pera