Apparatus and method for locating cellular telephones and...

G - Physics – 01 – S

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G01S 5/06 (2006.01) G01S 5/12 (2006.01) H04Q 7/36 (2006.01) H04Q 7/38 (2006.01) G01S 5/04 (2006.01)

Patent

CA 2171325

The field of locating cellular telephones suffers from high multipath city environments which affect accuracy. This problem can be overcome by a method for determining location by the time difference of arrival, tdoa, of signals from a cellular telephone (21) or other transmitter at cellular based stations (12-14). The method (20) includes determining tdoas for a plurality of channels, averaging the tdoas from the channels, subtracting the average tdoa from the individual channel tdoas to determine residual channel tdoas and determining an overall residual tdoa from the residual channel tdoas. Applications include emergency calls and criminal in investigations.

Le domaine de la localisation de téléphones cellulaires souffre d'environnements urbains à forte propagation par trajets multiples qui affectent la précision. Ce problème peut être surmonté grâce à un procédé permettant de déterminer la localisation par la différence entre les temps d'arrivée (tdoa) de signaux provenant d'un téléphone cellulaire (21) ou d'un autre émetteur à des stations de base cellulaires (12-14). Ledit procédé (20) consiste à déterminer les tdoa pour une pluralité de voies, à faire une moyenne des tdoa provenant des voies, à soustraire la tdoa moyenne des tdoa de voies individuelles pour déterminer des tdoa de voies restantes et à déterminer une tdoa restante globale à partir des tdoa de voies restantes. Les applications comprennent les appels d'urgence et les enquêtes criminelles.

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