Improved method for estimating tdoa and fdoa in a wireless...

Details Improved method for estimating tdoa and fdoa in a wireless... Improved method for estimating tdoa and fdoa in a wireless...

H - Electricity

04

W

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

Patent

CA 2454161

A method, used in locating a mobile transmitter, includes providing a set of cross-correlation values, wherein each cross-correlation value is associated with a corresponding TDOA and/or FDOA estimae and is produced by cross- correlating a reference signal with a cooperating signal (fig. 5). The reference signal comprises a copy of a signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal comprises a copy of the same signal as received at a second antenna. The method further includes determining a most likely range of TDOA and/or FDOA estimates, and then identifying an optimal cross-correlation value within a subset of cross-correlation values (fig. 10) corresponding to the most likely range of TDOA and/or FDOA estimates. The TDOA and/or FDOA value corresponding to the optimal cross-correlation value is then employed in calculating the location of the mobile transmitter.

L'invention concerne un procédé, utilisé pour localiser un émetteur mobile, qui consiste à fournir un ensemble de valeurs de corrélation croisée, chacune de ces valeurs étant associée à une estimation TDOA et/ou FDOA correspondante, et étant produite par une corrélation croisée entre un signal de référence et un signal coopérant (voir figure 5). Le signal de référence comprend une copie du signal émis par l'émetteur mobile tel que reçu au niveau d'une première antenne, et le signal coopérant comprend une copie du même signal tel que reçu au niveau d'une seconde antenne. Ce procédé consiste en outre à déterminer une gamme des estimations TDOA et/ou FDOA les plus probables, et à identifier une valeur de corrélation croisée optimale appartenant à un sous-ensemble de valeurs de corrélation croisée (voir figure 10) correspondant à la gamme d'estimations TDOA et/ou FDOA les plus probables. La valeur TDOA et/ou FDOA correspondant à la valeur de corrélation croisée optimale est ensuite utilisée pour calculer la localisation de l'émetteur mobile.

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