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METHODS AND SYSTEMS TO INCREASE ACCURACY IN THE NAVIGATION OF SINGLE FREQUENCY RECEIVERS

  • US 20100141510A1
  • Filed: 12/09/2008
  • Published: 06/10/2010
  • Est. Priority Date: 12/09/2008
  • Status: Active Grant
First Claim
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1. A method of mitigating errors in satellite navigation measurements, the method comprising:

  • at a satellite navigation receiver;

    receiving respective single-frequency signals from respective satellites in a plurality of satellites in a satellite navigation system;

    in the absence of differential corrections, calculating pseudorange and carrier-phase measurements corresponding to respective ones of the received single-frequency signals, including filtering the pseudorange and carrier-phase measurements in a Kalman filter having a state vector comprising a plurality of states, the plurality of states including a position state, a receiver clock state, and a plurality of bias states, each bias state corresponding to a respective satellite in the plurality of satellites, the filtering including updating the state vector; and

    updating an estimated position of the satellite navigation receiver in accordance with an update to the state vector;

    wherein a respective bias state in the plurality of bias states accounts for ambiguity, residual satellite clock bias, satellite orbital error, and ionospheric delay associated with a respective satellite in the plurality of satellites.

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