A system and method for communicating and/or geolocating...

G - Physics – 08 – G

Patent

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G08G 1/127 (2006.01) G08B 25/10 (2006.01) H04B 1/69 (2006.01) H04B 14/02 (2006.01)

Patent

CA 2332578

A system and method in which multiple remote transmitters communicate asynchronously with one or more receiving stations. The transmitters are low cost units which use inexpensive timing circuits to generate a pulse position encoded chirp signal which is used to modulate a carrier signal. Upon receipt of the signal at the receiving stations, the signal may be demodulated and decoded using a reference chirp signal which has been locally generated asynchronously to the timing of any of the transmitters. Using a time invariant matched filter, the receiving station obtains the time of arrival of the various transmitted signals and any additional data.

L'invention concerne un système et un procédé, selon lesquels plusieurs dispositifs de télétransmission communiquent de manière asynchrone avec une ou plusieurs stations réceptrices. Les émetteurs sont des unités relativement peu onéreuses qui font appel à des circuits de base de temps également peu onéreux pour produire un signal chirp codé par position d'impulsions et utilisé pour moduler un signal de porteuse. Après réception du signal au niveau des stations réceptrices, le signal peut être démodulé et décodé au moyen d'un signal chirp de référence qui a été localement produit de manière asynchrone par rapport à la base de temps de n'importe quel émetteur. Au moyen d'un filtre adapté ne variant pas dans le temps, la station réceptrice obtient le moment d'arrivée des différents signaux transmis et toutes données supplémentaires.

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