Method for locating a mobile station

Details Method for locating a mobile station Method for locating a mobile station

G - Physics

01

S

G01S 5/06 (2006.01) G01S 5/14 (2006.01) H04Q 7/36 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2257953

The method includes receiving (404) by a first base station (212) a signal (215) transmitted from the mobile station (216); demodulating (406) the signal by the first base station (212) to form a demodulated signal; remodulating (408) at least a portion of the demodulated signal to form a reference signal; receiving (412) by the first base station (212) and a second base station (210, 214) a retransmitted signal (217); comparing (414, 416), by the first base station (212), the retransmitted signal (217) with the reference signal to determine a first delay; comparing (414, 416), by the second base station (210, 214), the retransmitted second signal (217) with the reference signal to determine a second delay; and based on the first and second delays, determining (420) a location of the mobile station (216).

Le procédé faisant l'objet de cette invention consiste à recevoir (404) sur une première station de base (212) un signal (215) transmis depuis la station mobile (216); à démoduler (406) ce signal à la première station de base (212) afin de former un signal démodulé; à remoduler (408) au moins une partie du signal démodulé pour former un signal de référence; à recevoir (412) sur la première station de base (212) et sur une seconde station de base (210, 214) un signal retransmis (217); à comparer (414, 416) sur la première station de base (212) le signal retransmis (217) avec le signal de référence, afin de déterminer un premier décalage; à comparer (414, 416), sur la seconde station de base (210, 214), le second signal retransmis (217) avec le signal de référence, afin de déterminer un second décalage; et, sur la base de ces premier et second décalages, à déterminer (420) la position de la station mobile (216).

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