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Hybrid GNSS and TDOA Wireless Location System

  • US 20100039320A1
  • Filed: 08/14/2008
  • Published: 02/18/2010
  • Est. Priority Date: 08/14/2008
  • Status: Active Grant
First Claim
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1. A method for use in locating a mobile device, comprising:

  • (a) at the mobile device, obtaining pseudorange measurements based on signals received from one or more satellites, wherein said one or more satellites are satellites of at least one of a Global Navigation Satellite System (GNSS) or Global Positioning System (GPS);

    (b) computing GPS time difference of arrival (G-TDOA) values based on the GPS pseudorange measurements, said G-TDOA values representing baselines between the mobile device and the GPS/GNSS satellites;

    (c) obtaining an uplink time difference of arrival (U-TDOA) measurement representing a first baseline between first and second terrestrial receivers;

    (d) providing hybrid GPS/U-TDOA baselines;

    (e) computing weightings for the hybrid GPS/U-TDOA baselines; and

    (f) estimating the location of the mobile device using the hybrid GPS/U-TDOA baselines and the weightings.

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