Abstract: 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.

Abstract: 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.

Abstract: A method for reducing phase aberration in an antenna system for satellite, the antenna system being configured to receive and/or emit at least a spot beam, the antenna system including a reflector; an array feed including a plurality of feeds configured to illuminate the reflector in emission mode and/or configured to receive illumination from the reflector in reception mode; a trimming system configured to adjust the position of the reflector with respect to the array feed, the method including adjusting the position of the reflector with respect to the array feed in order to correct phase aberration in the spot beam.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A method for reducing phase aberration in an antenna system for satellite, the antenna system being configured to receive and/or emit at least a spot beam, the antenna system including a reflector; an array feed including a plurality of feeds configured to illuminate the reflector in emission mode and/or configured to receive illumination from the reflector in reception mode; a trimming system configured to adjust the position of the reflector with respect to the array feed, the method including adjusting the position of the reflector with respect to the array feed in order to correct phase aberration in the spot beam.

Abstract: 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.

Abstract: 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.

Abstract: A payload includes one or more antennas for receiving polarized radiofrequency signals; a device for regenerating radiofrequency signals by filtering, frequency transposition, and amplification; and antennas for transmitting the regenerated radiofrequency signals to one or more terrestrial terminals. The radiofrequency signal regeneration device includes a plurality of regeneration channels, each channel consisting of an amplification device capable of amplifying two radiofrequency signals having separate frequency bands and the transmission antennas associated with a regeneration chain are capable of transmitting two regenerated radiofrequency signals 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.

Abstract: A data collection device carried on board a satellite and making it possible to localise a source of interference, without using neighbouring 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.

Abstract: A method for establishing radiofrequency links via a telecommunication satellite having several spots, designated a multispot satellite, between at least one terrestrial station and a service area composed of a plurality of elementary covering zones, designated cells, each cell comprising a plurality of terrestrial terminals is disclosed. This type of satellite allows the use of several spots of antennae on board the satellite to cover contiguous geographical zones or cells, instead of a single broad spot. Each cell is associated with a spot to which a frequency band is attributed. In the case of the loss of a spot associated with a cell, designated a faulty cell, the spot (FR1, FR2, FB1, FB2, FV1, FV2) associated with at least one contiguous cell (CR1, CR2, CB1, CB2, CV1, CV2) to the said faulty cell is likewise associated with a part of the said faulty cell so that the area (CPJ?) of said faulty cell is reduced.

Abstract: A payload system for satellites comprising transponder devices with an input section including an uplink antenna, a low noise amplifier, and a converter, and an output section including an input filter, a high power amplifier, an output filter, and a downlink antenna. At least some of the transponders share their high power amplifiers and the high power amplifiers shared have a maximum power smaller than the total power which can be transmitted by the payload.

Abstract: A payload includes one or more antennas for receiving polarized radiofrequency signals; a device for regenerating radiofrequency signals by filtering, frequency transposition, and amplification; and antennas for transmitting the regenerated radiofrequency signals to one or more terrestrial terminals. The regeneration device includes a plurality of regeneration channels, each channel including an amplification device capable of amplifying a plurality of radiofrequency signals having separate frequency bands, and in that the transmission antennas are capable of transmitting regenerated radiofrequency signals, via a single regeneration channel, to non-contiguous basic coverage areas, respectively, the basic coverage areas belonging to a single cellular layout that uses at least two separate frequency bands and two separate polarizations.

Abstract: A payload includes one or more antennas for receiving polarized radiofrequency signals; a device for regenerating radiofrequency signals by filtering, frequency transposition, and amplification; and antennas for transmitting the regenerated radiofrequency signals to one or more terrestrial terminals. The radiofrequency signal regeneration device includes a plurality of regeneration channels, each channel consisting of an amplification device capable of amplifying two radiofrequency signals having separate frequency bands and the transmission antennas associated with a regeneration chain are capable of transmitting two regenerated radiofrequency signals 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.

Abstract: The present invention relates to a telecommunication network for establishing radiofrequency links between gateways and ground terminals via a telecommunication satellite with several spot beams, known as a multispot satellite. The network includes a multispot satellite including a payload for the reception, processing and retransmitting of telecommunication signals received by said satellite, a service area comprised of a plurality of basic coverage areas, known as cells, each cell including a plurality of ground terminals and a plurality NGWactive of active gateways interconnected by a ground network, NGWactive being an integer, said satellite relaying signals sent by said NGWactive active gateways to said cells. Furthermore, the network includes NGW gateways, NGW being an integer strictly greater than the number NGWactive of active gateways, said NGW gateways being interconnected by said ground network and including said NGWactive active gateways such that NGW?NGWactive gateways are not active.

Abstract: The present invention concerns a telecommunication network for establishing radiofrequency links between at least one gateway and ground terminals via a multispot telecommunication satellite. The network includes a service zone composed of a plurality of cells each including a plurality of ground terminals, the said service zone being split into N sub-zones, N being an integer strictly greater than 1, each sub-zone having a capacity profile evolving in time over a given period and presenting a maximum value, the said maximum values of each of the capacities being shifted with regard to time and a multispot satellite including a transponder including amplification of the signals emitted by the gateway on the forward link and the signals emitted by the cells on the return link and a continuous power supply system of the amplifier.

Abstract: A telecommunication network for establishing radiofrequency links between gateways and ground terminals via a multispot satellite, the network comprising a multispot satellite, a plurality of gateways, each gateway establishing a link with the satellite on at least Ns link channels corresponding to Ns frequency intervals [fi; fi+1] with i varying from 0 to Ns?1 and a service area comprised of Nc cells each comprising a plurality of ground terminals, each cell being associated with a link spot beam with the satellite to which is allocated a frequency interval selected from among a plurality of frequency intervals [f?i; f?i+1] with i varying from 0 to N?1, N being an integer strictly greater than 1, is disclosed. The frequency f?0 is substantially equal to the frequency fNs or the frequency f?N is substantially equal to the frequency f0. Each of the gateways is located in one of the Nc cells.

Abstract: A satellite-borne transponder for two or more uplink service areas, includes uplink antennae, a low noise amplifier and a converter for each uplink antenna, input filters, amplification chains, each amplification chain including a channel amplifier, a high power amplifier, and an output filter, and a downlink antenna for an associated downlink service area. The transponder associates uplink antennae to an uplink service area, the number of antennae being determined by a preset Figure of Merit for each uplink service area. The transponder also includes at least one input multiplexer including a passband filter for each reception chains, each reception chain including an uplink antenna, a low noise amplifier, and a converter linked to the multiplexer.

Abstract: A method for the optimization of the payload of a multispot telecommunication satellite is disclosed. This type of satellite allows the use of several antenna spots on board the satellite to cover contiguous geographical zones, instead of a single broad spot. The method uses the division of an amplification unit such as a travelling wave tube TWTA between several spots.