Detection of time of arrival of cdma signals in a wireless...

G - Physics – 01 – S

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G01S 5/06 (2006.01) H04W 64/00 (2009.01)

Patent

CA 2701108

In a Wireless Location System (WLS) deployed in connection with a CDMA-based wireless communications sys-tem, Location Measurement Units are used to collect multi-path corrupted radio signaling for use in time difference of arrival (TDOA) and hybrid positioning methods. Signal processing techniques are used to enhance the WLS's ability to determine the minimally time- delayed multi-path component and thus increase the accuracy of the TDOA location in CDMA-based wireless communications systems. The signal processing includes a filtering technique for reducing the leading sidelobes of the cross-correlation function as well as a leading edge discovery procedure.

L'invention concerne, dans un système de localisation sans fil (WLS) déployé en association avec un système de communications sans fil à base de CDMA, des unités de mesure de localisation qui sont utilisées pour recueillir une signalisation radio corrompue à plusieurs trajets à utiliser dans des procédés de différence d'instants d'arrivée (TDOA) et de positionnements hybrides. Des techniques de traitement de signal sont utilisées pour améliorer l'aptitude du WLS à déterminer la composante à plusieurs trajets retardée au minimum et augmenter ainsi la précision de la localisation TDOA dans des systèmes de communications sans fil à base de CDMA. Le traitement de signal comprend une technique de filtrage pour réduire les lobes latéraux d'attaque de la fonction de corrélation croisée de même qu'un processus de découverte de bord d'attaque.

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