System and method for narrowing the range of frequency...

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G01S 1/00 (2006.01) H04B 7/216 (2006.01) H04L 27/00 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2335136

A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system (100) with relative signal source and receiver motion. The satellite communications system (100) includes a user terminal (124, 126) (for example, a mobile wireless telephone), a gateway (120, 122, 112) (terrestrial base station), and at least one satellite (116, 118) with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses (309), coherently accumulating samples of the pilot signal over a plurality of chips (315), measuring the energy of the accumulated pilot signal samples (318), accumulating the energy measurements over a plurality of chips to produce an energy accumulation value (321), and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value (324).

La présente invention concerne un système et un procédé permettant de réduire le domaine d'incertitude de fréquence dans le cas d'un glissement de signal par effet Doppler dans le cadre d'un système de communications par satellite (100) avec source relative de signal et mouvement du récepteur. Le système de communications par satellites (100) comprend un terminal d'utilisateur (124, 126) (par exemple un radiotéléphone mobile), une passerelle (120, 122, 112) (station de base terrestre) et au moins un satellite (116, 118) dont la position et la vitesse relative sont inconnues. Le procédé consiste a: faire glisser le signal sur diverses hypothèses de fréquences (309); accumuler de façon cohérente des échantillons du signal pilote sur un certain nombre de puces (315); mesurer l'énergie des échantillons (318) de signal pilote accumulés, accumuler les relevés d'énergie sur un certain nombre de puces de manière à produire une valeur d'accumulation d'énergie (321); et déterminer laquelle parmi les diverses hypothèses de fréquences donne la valeur d'accumulation d'énergie la plus élevée (324).

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