Location of wideband ofdm transmitters with limited receiver...

G - Physics – 01 – S

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G01S 5/02 (2006.01) G01S 5/04 (2006.01) G01S 5/06 (2006.01) G01S 5/14 (2006.01) H04J 11/00 (2006.01)

Patent

CA 2672460

A system for locating wireless transmitters employing an Orthogonal Frequency Division Multiplexing (OFDM) digital modulation scheme. The OFDM scheme comprises transmitting signal components over narrowband frequency channels spanning a wideband channel. The system includes a first receiving system configured to receive a fraction of the signal components transmitted by a first wireless transmitter to be located in a fraction of the narrowband frequency channels, and to process the fraction of the signal components to derive location related measurements. The system further includes at least a second receiving system configured to receive the fraction of the signal components transmitted by the first wireless transmitter, and to process this fraction of the signal components to derive location related measurements. The system also includes a processing system configured to use location related measurements from the first and second receiving systems to compute the location of the wireless transmitter.

L'invention concerne un système pour localiser des émetteurs sans fil en utilisant un schéma de modulation numérique par multiplexage par répartition de fréquence orthogonale (OFDM). Le schéma OFDM comporte la transmission de composantes de signal sur des canaux de fréquence à bande étroite enjambant un canal à bande large. Le système comprend un premier système de réception configuré pour recevoir une fraction des composantes de signal transmises par un premier émetteur sans fil devant être localisé dans une fraction des canaux de fréquence à bande étroite, et pour traiter la fraction des composantes de signal pour déduire des mesures à référence spatiale. Le système comprend en outre au moins un second système de réception configuré pour recevoir la fraction des composantes de signal transmise par le premier émetteur sans fil, et pour traiter cette fraction des composantes de signal pour déduire des mesures à référence spatiale. Le système comprend également un système de traitement configuré pour utiliser des mesures à référence spatiale à partir des premier et second systèmes de réception pour calculer l'emplacement de l'émetteur sans fil.

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