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Navigation processing for a satellite positioning system receiver

  • US 7,751,974 B2
  • Filed: 03/17/2005
  • Issued: 07/06/2010
  • Est. Priority Date: 08/29/2000
  • Status: Expired due to Fees
First Claim
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1. A method of verifying the validity of a Satellite Positioning Systems (SATPS) three-satellite solution for determining a receiver'"'"'s location, comprising:

  • obtaining a primary solution and an alternate solution using signals from the three SATPS satellites, wherein the primary solution and the alternate solution comprise least-square solutions that satisfy predefined pseudorange measurement constraints;

    separating the three SATPS satellites into a first pair of SATPS satellites and a second pair of SATPS satellites;

    measuring Doppler difference for the first pair of SATPS satellites, thereby obtaining a first measured value of Doppler difference;

    measuring Doppler difference for the second pair of SATPS satellites, thereby obtaining a second measured value of Doppler difference;

    computing a first estimated value of Doppler difference for the first pair of SATPS satellites, and a second estimated value of Doppler difference for the second pair of SATPS satellites;

    computing a first Doppler difference residual for the first pair of SATPS satellites by subtracting the first estimated value of Doppler difference from the first measured value of Doppler difference;

    computing a second Doppler difference residual for the second pair of SATPS satellites by subtracting the second estimated value of Doppler difference from the second measured value of Doppler difference; and

    comparing the computed first and second Doppler difference residuals to determine a valid solution from the primary and alternate solutions.

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