Satellite telecommunication system comprising a mechanism for seperating messages transmitted by a plurality of transmitters

摘要

A satellite telecommunications system comprises at least one satellite receiving signals originating from a plurality of transmitters present in a surveillance zone called a task, the transmission of the signals by the transmitters being discontinuous and organized into time slots. The satellite includes an array of reception antennas, a set of digital reception filters being associated with each antenna. The satellite also includes means for separating the signals originating from various transmitters and colliding in one and the same slot, said separation being carried out by adapting the coefficients of the digital reception filters, said coefficients being deduced from predictions of the position of the transmitters.

主权项

1. A satellite telecommunications system, comprising:
at least one satellite receiving signals originating from a plurality of transmitters present in a surveillance zone called a task, a transmission of the signals by the transmitters being discontinuous and organized into time slots, the satellite comprising an array of reception antennas; a set of digital reception filters being associated with each antenna, means for separating the signals originating from various transmitters and the signals colliding in one and the same slot, said means for separating adapting coefficients of the digital reception filters, said coefficients being deduced from predictions of positions of the transmitters, wherein the positions of the transmitters at a given instant are predicted by using a content of a historical database comprising a historical log of the positions of the transmitters, a model used for the prediction taking into account the position of each of the transmitters at a given instant as well as their visibility by the antenna array onboard the satellite; and wherein, for a given velocity and a direction of a transmitter, a position Pest(t) of the transmitter at instant t is estimated at the instant t by using the following expression:
Pest(t)=P(t0)+{right arrow over (d)}(t−t0)V in which:
P(t0) represents the known position acquired during a last observation of the transmitter by the satellite at the instant t0; {right arrow over (d)}(t−t0) represents the direction of the transmitter during a time interval t−t0; and v represents the velocity of the transmitter.