Non-directional coverage satellite

H - Electricity – 04 – B

Patent

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Details

H04B 7/185 (2006.01) H04B 7/216 (2006.01)

Patent

CA 2296204

The invention concerns a satellite having at least two antennas (3, 5) whose radiation patterns overlap, at least in part and means (45; 47, 49, 51) for receiving the sum of the signals from the various antennas. To limit multipath problems when summing signals from the antennas, the invention proposes that the receiver means include means for demodulating a spread spectrum signal and that the absolute difference between the respective transmission times of signals transmitted to the receiver means via two antennas is greater than one chip of the spread spectrum modulation. Application to a satellite TTC (telemetry, tracking and command) link.

L'invention concerne un satellite présentant au moins deux antennes (3, 5) dont les diagrammes se superposent au moins partiellement, et des moyens de réception (45; 47, 49, 51) de la somme des signaux provenant des différentes antennes. Pour limiter les problèmes de trajets multiples lors de la sommation des signaux provenant des antennes, l'invention propose que les moyens de réception comprennent des moyens de démodulation d'un signal à spectre étalé, et que la différence entre les temps de transmission respectifs d'un signal transmis vers les moyens de réception par deux antennes est supérieure en valeur absolue à une bribe de la modulation à étalement de spectre. Application à la liaison TTC (télémétrie, poursuite, et télécommande) d'un satellite.

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