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METHOD FOR THE ACCELERATED ACQUISITION OF SATELLITE SIGNALS

  • US 20070194985A1
  • Filed: 12/28/2006
  • Published: 08/23/2007
  • Est. Priority Date: 12/29/2005
  • Status: Active Grant
First Claim
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1. A method of accelerated acquisition of positioning satellite signals from a satellite location system for a mobile terminal moving from the interior to the exterior of a building, the mobile terminal coupling a transceiver capable of exchanging signals of a local range telecommunication system to a transceiver capable of exchanging positioning satellite signals of the satellite location system, which method includes the following steps:

  • a step of determination of the approximate position of the terminal by measuring a parameter of a signal coming from at least one access point of the local range telecommunication system immediately the terminal searching for location information detects such an access point, a step of determination of the orientations of the various satellites of the satellite location system capable of being perceived from the determined position of the terminal, a step of determination of the probability of acquisition of signals coming from the various satellites, as a function of the azimuth and the elevation of each of said satellites perceived and a radio wave attenuation coefficient for the determined position of the terminal known to a system of graphical representation of buildings and of representation of their internal architecture, the latter system being adapted to associate with each position in a building a distribution of probability of acquisition of a satellite signal coming from a given direction, a step of searching for satellite signals coming from said satellites for which the probability of reception exceeds a certain threshold, a step of synchronization of the terminal to the satellite signal or signals acquired.

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