| 摘要 |
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. |
| 主权项 |
1. A method for establishing radiofrequency links via a multispot telecommunication satellite having several spots between at least one gateway and a service area comprising a plurality of elementary covering zones, designated cells, each cell being associated to a spot and comprising a plurality of terrestrial terminals, said method comprising establishing a forward link between the gateway towards the plurality of terrestrial terminals that comprises:
a first step of uplink emission in which the gateway emits a first analog radiofrequency signal towards the multispot satellite, said first analog radiofrequency signal being emitted with a first spectral efficiency; a second step in which a payload of the multispot satellite receives the first analog radiofrequency signal; a third step in which the payload of the multispot satellite processes the first analog radiofrequency signal, said processing comprising:
a first sub-step of analog-to-digital conversion of said first analog radiofrequency signal in order to obtain a first digital radiofrequency signal,a second sub-step of demodulation and decoding of the first digital radiofrequency signal according to a first communication protocol in order to obtain extracted data, thanks to a first part of a digital unit of the payload,a third sub-step of coding and modulation of said extracted data according to a second communication protocol in order to obtain a second digital radiofrequency signal, thanks to a second part of the digital unit of the payload,a fourth sub-step of digital-to-analog conversion of said second digital radiofrequency signal in order to obtain a plurality of second analog radiofrequency signals, a fourth step of downlink emission in which the payload of the multispot satellite emits said plurality of second analog radiofrequency signals towards said cells, said plurality of second analog radiofrequency signals being emitted with a second spectral efficiency, the first spectral efficiency being greater than the second spectral efficiency. |
