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METHOD OF OPTIMIZATION OF PROCESSING OF LOCATION DATA IN THE PRESENCE OF A PLURALITY OF SATELLITE POSITIONING CONSTELLATIONS

  • US 20070236387A1
  • Filed: 12/28/2006
  • Published: 10/11/2007
  • Est. Priority Date: 12/29/2005
  • Status: Active Grant
First Claim
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1. Method of management of positioning satellite signals (15a, 15b, 15c) coming from a first constellation of satellites (GPS, 26) and a second constellation of satellites (Galileo, 25) of a first and a second satellite location system for locating a mobile terminal (27) of a cellular communication network capable of exchanging satellite signals with the first and second satellite location systems (GPS, Assisted GPS, Galileo, Assisted Galileo), characterized in that said method comprises the following steps:

  • a step (16) of determination of an approximate pre-location of the terminal, a step (17) of estimation of the position of the satellites of said first and second constellations, a step of resolution of the list of satellites visible from the terminal as a function of the approximate pre-location of the terminal that has been determined and from the estimated position of the satellites, a step (18) of calculation of the elevation and the azimuth of each satellite from the list of satellites visible from the terminal as a function of the approximate position of the terminal, a step (21, 22, 23, 24) of sorting of the satellites from the list of visible satellites by;

    giving preference to one of said satellite constellations on the basis of a performance criterion, excluding (24) from the list of visible satellites all of the satellites belonging to the constellations other than the preferred constellation and the position whereof in azimuth and in elevation from the point of view of the terminal is confined within a predetermined angular range relative to one of the satellites of the preferred constellation.

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