Position location system and method

Details Position location system and method Position location system and method

G - Physics

01

S

G01S 5/06 (2006.01) G01S 1/04 (2006.01) G01S 5/14 (2006.01)

Patent

CA 2240628

A position location system includes multiple base stations spaced over a region. A portable unit within the region transmits a locating signal which is received by the base stations. The base stations report amplitude, phase and time data related to the locating signal to a control station. The control station includes a processor and memory that combine the data from all of the participating base stations to directly compute an optimal estimate of the location of the portable unit. The control station generates an ambiguity function based upon the probability that the portable unit is located at a particular position. By optimizing the ambiguity function, the error in the computation is minimized to produce an accurate position estimate.

Système de localisation de position comprenant des stations de base multiples espacées sur une région. Une unité portable située dans la région envoie un signal de localisation que reçoivent les stations de base. Les stations de base communiquent à une station de commande les données d'amplitude, de phase et temporelles relatives au signal de localisation. La station de commande comprend un processeur et une mémoire qui combinent les données provenant des stations de base participantes afin de procéder directement à une estimation optimale de la localisation de l'unité portable. La station de base génère une fonction d'ambiguïté basée sur la probabilité que l'unité portable se trouve à une position particulière. En optimisant la fonction d'ambiguïté, l'erreur de calcul est minimisée et on obtient une estimation précise de la position.

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