Eutelsat S a

Eutelsat

Emmanuel Lance

Hector Fenech

Jacques Dutronc

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.

Payload for a multi-beam satellite

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 (FR, FR, FB, FB, FV, FV) associated with at least one contiguous cell (CR, CR, CB, CB, CV, CV) 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.

Method for establishing radiofrequency links via a multispot satellite

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.

Payload system for satellites

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 Nof active gateways interconnected by a ground network, Nbeing an integer, said satellite relaying signals sent by said Nactive gateways to said cells. Furthermore, the network includes Ngateways, Nbeing an integer strictly greater than the number Nof active gateways, said Ngateways being interconnected by said ground network and including said Nactive gateways such that N&#x2212;Ngateways are not active.

Telecommunication network

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. The said supply system includes means for supplying the amplifier providing the whole of the sub-zones with their respective capacity profile evolving over the said given period, the maximum continuous power delivered by the supply system being less than the continuous power which the amplifier would consume to provide simultaneously the whole of the sub-zones with their maximum capacity value.

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 [f; f] with i varying from 0 to Ns&#x2212;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'; f&#x2032;] with i varying from 0 to N&#x2212;1, N being an integer strictly greater than 1, is disclosed. The frequency f&#x2032;is substantially equal to the frequency for the frequency f&#x2032;is substantially equal to the frequency f. Each of the gateways is located in one of the Nc cells. The cells in which the gateways are located are associated with a spot beam to which is allocated a frequency interval selected from among the frequency intervals [f&#x2032;; f&#x2032;] with i varying from 1 to N&#x2212;1 in the case where the frequency f&#x2032;is substantially equal to the frequency for [f&#x2032;; f&#x2032;] with i varying from 0 to N&#x2212;2 in the case where the frequency f&#x2032;is substantially equal to the frequency f.

Communication network

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.

Uplink frequency multiplexing system

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.

Growing community of inventors

Clichy, France

Emmanuel Lance