Two-way rf ranging system and method for local positioning

Details Two-way rf ranging system and method for local positioning Two-way rf ranging system and method for local positioning

G - Physics

01

S

G01S 5/10 (2006.01)

Patent

CA 2526840

A positioning system includes a plurality of devices configured to exchange RF signals with one another. A first device periodically receives a message from each other device during time slots assigned them. The received message includes information representing a time of arrival at the other device of a respective message transmitted by the first device. A time of arrival of the message from each of the other devices is determined by the first device. The first device periodically transmits messages to the other devices, each transmitted message including information representing the determined time of arrival for at least one of the other devices. A range from the first device to each of a plurality of the other devices is determined as function of the determined time of arrival of the message from the other device and the time of arrival information in the message from the other device.

L'invention concerne un système de positionnement qui comprend une pluralité de dispositifs configurés pour échanger entre eux des signaux RF. Un premier dispositif reçoit prédiodiquement un message de chaque autre dispositif pendant des créneaux temporels attribués. Le message reçu comprend des données représentant l'heure d'arrivée, à l'autre dispositif, d'un message respectif transmis par le premier dispositif. L'heure d'arrivée du message provenant de chacun des autres dispositifs est déterminée par le premier dispositif. Le premier dispositif transmet périodiquement des messages aux autres dispositifs, chaque message transmis comprenant des données représentant l'heure d'arrivée déterminée pour au moins un des autres dispositifs. La distance entre le premier dispositif et chacun des autres dispositifs est déterminée en fonction de l'heure d'arrivée déterminée du message et des données relatives à l'heure d'arrivée contenues dans ledit message.

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