Improvements in radio positioning systems

G - Physics – 01 – S

Patent

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Details

G01S 1/04 (2006.01) G01S 5/10 (2006.01) G01S 5/02 (2006.01)

Patent

CA 2450576

The present invention sets out to overcome the hearability problem in CDMA communications networks in which positioning services are provided, by using a separate sampling device (204, 205, 206) for each transmitter (201, 202, 203), which sends to the computing device (208) a representation of the signals transmitted only by that transmitter. A cross-correlation of the representation sent back by the mobile terminal (207) with the representation sent back by the sampling device in the brightest transmitter is performed in the computing device (208), and an estimate of that brightest signal is subtracted from the representation sent back by the mobile terminal (207) in order to reduce its effect on the remaining signals as far as possible. The cross-correlation and subtraction steps are iterated until no useful signals remain to be extracted.

L'invention a pour objet la solution du problème d'audibilité dans des réseaux de communications AMRC qui disposent de services de positionnement, par l'utilisation d'un dispositif d'échantillonnage distinct (204, 205, 206) pour chaque émetteur (201, 202, 203), qui envoie au dispositif informatique (208) une représentation des signaux émis par le seul émetteur. On effectue, dans le dispositif informatique (208), une corrélation croisée de la représentation renvoyée par le terminal mobile (207) avec la représentation renvoyée par le dispositif d'échantillonnage dans l'émetteur le plus clair, puis on soustrait une estimation du signal le plus clair concerné de la représentation renvoyée par le terminal mobile (207) afin de réduire autant que possible ses effets sur les signaux restants. On répète les étapes de corrélation croisée et de soustraction jusqu'à ce qui ne reste aucun signal utile à extraire.

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