Method and apparatus for estimating velocity of a terminal...

G - Physics – 01 – S

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G01S 11/10 (2006.01) G01S 5/14 (2006.01)

Patent

CA 2427129

Techniques to estimate the velocity of a terminal in a wireless communication system. Movement by the terminal results in a Doppler shift in the frequency of each transmitted signal received at the terminal. In one method, the positions of the terminal, a base station, and each of two or more satellites are initially determined. A residual rate of a change of pseudo-range may also be determined for each satellite, e.g., based on (1) an estimated baseband frequency error that includes the Doppler frequency shift due to the terminal's movement and (2) an estimated Doppler frequency shift due to movement by the satellite. A set of equations is then formed based on the determined positions of the terminal, the base station, and the satellites and the determined residual rates of change of pseudo-ranges for the satellites. The velocity of the terminal may thereafter be estimated based on the set of equations.

L'invention porte sur des techniques visant à calculer la vitesse d'un terminal dans un système de communication hertzien. Le déplacement du terminal entraîne un effet Doppler affectant la fréquence des différents signaux émis ou reçus par le terminal. Un procédé de cette invention consiste d'abord à déterminer les positions du terminal, d'une station de base et de chacun des satellites. Selon un autre procédé, il est également possible de déterminer une vitesse résiduelle de variation de pseudo-distance pour chaque satellite, par exemple, à partir (1) d'une erreur de fréquence de bande de base estimée englobant l'effet Doppler propre au déplacement du terminal et (2) d'un effet Doppler estimé propre au déplacement du satellite. On construit ensuite un ensemble d'équations en fonction des positions déterminées du terminal, de la station de base et des satellites et des vitesses résiduelles déterminées de variation des pseudo-distances pour les satellites. Il est donc possible de calculer la vitesse du terminal à partir de l'ensemble des équations.

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