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Methods and apparatus to detect and correct integrity failures in satellite positioning system receivers

  • US 7,501,981 B2
  • Filed: 06/08/2006
  • Issued: 03/10/2009
  • Est. Priority Date: 11/18/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • measuring a plurality of pseudoranges using an antenna;

    performing a first position fix iteration using the plurality of measured pseudoranges to form a first measurement error vector;

    performing a second position fix iteration using the plurality of measured pseudoranges to form a second measurement error vector;

    computing a first mean of the first measurement error vector;

    subtracting the first mean from the first measurement error vector to form a first zero-mean error vector;

    computing a second mean of the second measurement error vector;

    subtracting the second mean from the second measurement error vector to form a second zero-mean error vector;

    computing a sum vector of the first and the second zero-mean error vectors; and

    determining whether an integrity failure has occurred based on the sum vector.

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