Relative positioning method and relative positioning system...

G - Physics – 01 – S

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G01S 5/14 (2006.01)

Patent

CA 2585141

A positioning system wherein radio waves from a GPS satellite (4) are received by a reference station (1), the absolute position of which is already known, and a plurality of mobile stations (3) to perform relative positioning among particular stations, thereby determining the positions of the mobile stations (3). At least one of the mobile stations (3) is disposed such that a baseline limit length allowing relative positioning relative to the reference station (1) is exceeded, and the intervals between particular mobile stations (3) are shorter than the baseline limit length allowing relative positioning. Each of the stations (1,3) is equipped with a GPS receiver (11,21) that receives the radio waves from the GPS satellite (4), and further equipped with a wireless communication apparatus (12,22) that transmits/receives data to/from a particular station. There are provided a relative position calculation part (32) for calculating the relative position between the particular stations; and an absolute position calculation part (33) for determining, based on an absolute position of one station that performs a relative positioning, an absolute position of the other station.

La présente invention concerne un système de positionnement dans lequel des ondes radio provenant d'un satellite GPS (4) parviennent à une station de référence (1), dont la position absolue est déjà connue, et une pluralité de stations mobiles (3) pour réaliser un positionnement relatif parmi des stations particulières, et déterminer ainsi les positions des stations mobiles (3). Au moins une station mobile (3) est disposée de sorte que l'on dépasse une longueur limite de ligne de base permettant un positionnement relatif à la station de référence (1) et que les intervalles entre les stations mobiles particulières (3) soient inférieurs à la longueur de la limite de la ligne de base autorisant le positionnement relatif. Chacune des stations (1, 3) est équipée d'un récepteur GPS (11, 21) qui reçoit les ondes radio du satellite GPS (4) ainsi que d'un appareil de communication sans fil (12, 22) qui transmet des données vers une station particulière et en reçoit de celle-ci. L'invention concerne également une partie de calcul de position relative (32) permettant de calculer la position relative entre les stations particulières et une partie de calcul de la position absolue (33) pour déterminer, en se basant sur la position absolue d'une station qui réalise un positionnement relatif, la position absolue de l'autre station.

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