Aiding beam identification in a satellite system

Details Aiding beam identification in a satellite system Aiding beam identification in a satellite system

H - Electricity

04

B

H04B 7/185 (2006.01)

Patent

CA 2464369

A system and method for determining timing offset errors in a satellite system based upon Doppler and Doppler rate of change is provided. A user terminal (110, 113) determines first and second timing offsets (902, 906) respectively associated with first and second satellite beams (1142, 1204) from respective first and second satellites (102, 104). Next, the user terminal (110, 113) determines the Doppler and Doppler rate of change associated with the first and second satellite beams (1100, 1102). A timing offset is estimated from the measured Doppler and Doppler rate of change and is then compared with the user terminal's own determined timing offset (906). If the comparison does not produce a value within a predetermined threshold, a beam identification error is declared.

L'invention concerne un système et un procédé déterminant des erreurs de décalage temporel dans un système satellite sur la base de l'effet Doppler et du taux de changement Doppler. Un terminal utilisateur (110, 113) détermine les premiers et seconds décalages temporels (902, 906) associés respectivement à un premier et à un second faisceau satellite (1142, 120¿4?) provenant respectivement du premier et second satellite (102, 104). Puis, le terminal utilisateur (110, 113) détermine l'effet Doppler et le taux de changement Doppler associé au premier et second faisceau satellite (1100, 1102). Un décalage temporel est estimé à partir des effets Doppler et taux de changement Doppler mesurés puis il est comparé au propre décalage temporel (906) du terminal utilisateur. Si la comparaison ne produit pas une valeur comprise à l'intérieur d'un seuil prédéterminé, une erreur d'identification de faisceau est alors déclarée.

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