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1. (WO2018015574) METHOD AND SYSTEM FOR PROVIDING ASSISTANCE TO GEOLOCATION OF NODE DEVICES OF AN ASYNCHRONOUS RF NETWORK

Pub. No.:    WO/2018/015574    International Application No.:    PCT/EP2017/068689
Publication Date: Fri Jan 26 00:59:59 CET 2018 International Filing Date: Tue Jul 25 01:59:59 CEST 2017
IPC: G01S 19/09
G01S 19/34
G01S 19/46
G01S 5/00
Applicants: ABEEWAY
Inventors: BOUDAUD, Stéphane
Title: METHOD AND SYSTEM FOR PROVIDING ASSISTANCE TO GEOLOCATION OF NODE DEVICES OF AN ASYNCHRONOUS RF NETWORK
Abstract:
Where each node device (200) is assumed to know the time-of-day with an accuracy of only plus or minus 1 second (that is an insufficient accuracy for geolocation purposes), the geolocation of said node device (200) is determined by an A-GNSS server (500) by help of a time-stamp known with an accuracy better than or equal to 10 milliseconds and added by at least one transceiver (300) of the asynchronous RF network (100). Indeed the technical feature of said asynchronous RF network (100) according to which the time-of-day at which data are sent from each node device (200) is known in a deterministic manner allows the A-GNSS server (500) to determine retrospectively this time-of-day in function and with the precision of the time-stamp added by said at least one transceiver (300) to the data packet (210) issued from said node device (200) over the asynchronous RF network (100).