Methods and apparatus to detect and correct integrity failures in satellite positioning system receivers
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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Abstract
Methods and apparatus to detect integrity failures in satellite position system (SPS) receivers are disclosed. An example method comprises estimating a position fix from a plurality of pseudoranges, computing a zero-mean error vector based upon the position fix; and determining if an integrity failure has occurred based on the zero-mean error vector.
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Citations
17 Claims
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1. A method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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an antenna to receive a plurality of times from respective ones of a plurality of satellites; a measurement engine to calculate a plurality of pseudoranges based on the received plurality of times; a position fix engine to estimate a position fix using the plurality of measured pseudoranges, and to compute a measurement error vector based on the position fix; computing logic to compute a mean of the measurement error vector; a summer to subtract the mean from the measurement error vector to form a zero-mean error vector; and an integrity failure detector to detect an integrity failure based on the zero-mean error vector. - View Dependent Claims (10, 11, 12)
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13. An article of manufacture storing machine accessible instructions which, when executed, cause a machine to:
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measure a plurality of pseudoranges using an antenna; estimate a position fix from the plurality of measured pseudoranges; compute a first measurement error vector based on the position fix and the plurality of measured pseudoranges; compute a mean of the first measurement error vector; subtract the mean from the first measurement error vector to form a first zero-mean error vector; and determine whether an integrity failure has occurred based on the first zero-mean error vector. - View Dependent Claims (14, 15, 16, 17)
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Specification