| 主权项 |
1. A payload for augmentation satellite comprising an input channel suitable for receiving navigation signals transmitted by at least one navigation land earth station in a first frequency band and a plurality of output channels, each suitable for broadcasting navigation signals in a frequency band different from said first band and from other broadcasting bands, comprising a navigation processor suitable for implementing the following operations for each of said received signals:
from a first set of spreading codes each associated with a navigation land earth station and for each of said codes, unspreading the signal in phase in order to extract a pilot signal, authenticating said pilot signal and deducing from it the station transmitting said signal, if the authentication is negative, blocking said navigation signal, measuring the signal-to-noise and interference ratio affecting said pilot signal, retaining, from the navigation signals received, the one that exhibits the highest signal-to-noise and interference ratio and for which the authentication is positive, said retained signal being called nominal signal, the station transmitting the nominal signal being called nominal station, the other transmitting stations being called redundant stations, from a second set of spreading codes each associated with a type of navigation signal intended to be transmitted on one of the broadcasting frequency bands and for each of said codes, unspreading the nominal navigation signal in quadrature, transmitting said nominal navigation signal in the broadcasting frequency band associated with the spreading code used. |
