METHODS AND APPARATUS FOR GEOMETRY EXTRA-REDUNDANT ALMOST FIXED SOLUTIONS
First Claim
Patent Images
1. A method, comprising:
- selecting almost fixed solutions with a correctly fixed solution to form an extended pull-in region (EPIR) so that a probability of almost fixed (PAF) over the EPIR an integrity allocation; and
computing protection levels including effects of incorrect fixes associated with the almost fixed solutions in the EPIR.
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Abstract
Methods and apparatus for providing high integrity probability of connect fix (PCF) in GPS navigation applications, such as precision approach and landing and airborne refueling. In an exemplary embodiment, an enlarged pull in region is used to compute protection levels. In an exemplary embodiment, geometric extra-redundancy is used to enhance PCF and PAF (probability of almost fixed). In an exemplary embodiment, geometric extra-redundancy almost fixed solutions provide superior accuracy and integrity for GPS navigation applications.
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Citations
24 Claims
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1. A method, comprising:
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selecting almost fixed solutions with a correctly fixed solution to form an extended pull-in region (EPIR) so that a probability of almost fixed (PAF) over the EPIR an integrity allocation; and computing protection levels including effects of incorrect fixes associated with the almost fixed solutions in the EPIR. - View Dependent Claims (2, 3, 4)
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5. A method, comprising:
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generating a relative navigation solution by a fixed solution from the GPS observables; computing protection levels by selecting almost fixed solutions with a correctly fixed solution to form an extended pull-in region (EPIR) so that a probability of almost fixed (PAF) over the EPIR meets an integrity allocation; computing protection levels including effects of incorrect fixes associated with the almost fixed solutions in the EPIR; and outputting a relative navigation solution based upon the fixed solution and protection levels associated with the EPIR. - View Dependent Claims (6, 7, 8, 9)
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10. A method, comprising:
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collecting two or more sets of reference GPS information; correcting the reference GPS information to a common reference point; combining the two or more sets of reference GPS information with one or more sets of user GPS information to form GPS observables for relative positioning; and using two or more sets of combined GPS observables for carrier phase integer ambiguity resolution for a common relative baseline vector. - View Dependent Claims (11)
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12. A method, comprising:
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collecting two or more sets of reference GPS information; correcting the reference GPS information to a common reference point; combining the two or more sets of reference GPS information with one or more sets of user GPS information to form two or more sets of GPS observables for relative positioning; using the two or more sets of combined GPS observables for carrier phase integer ambiguity resolution for a common relative baseline vector; generating a relative navigation solution by a fixed solution from the GPS observables; computing protection levels by selecting almost fixed solutions with correctly fixed solution to form an extended pull-in region (EPIR) so that a probability of almost fixed (PAF) over the EPIR meets an integrity allocation; and computing protection levels including effects of incorrect fixes associated with the almost fixed solutions in the EPIR. outputting a relative navigation solution based upon the fixed solution and protection levels associated with the EPIR. - View Dependent Claims (13, 14, 15, 16)
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17. A system, comprising:
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a first module to select almost fixed solutions with a correctly fixed solution to form an extended pull-in region (EPIR) so that a probability of almost fixed (PAF) over the EPIR meets an integrity allocation; and a second module to compute protection levels including effects of incorrect fixes associated with the almost fixed solutions in the EPIR. - View Dependent Claims (18, 19, 20)
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21. A computer-readable storage medium having computer readable code, the medium comprising instructions for:
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selecting almost fixed solutions with a correctly fixed solution to form an extended pull-in region (EPIR) so that a probability of almost fixed (PAF) over the EPIR meets an integrity allocation; and computing protection levels including effects of incorrect fixes associated with the almost fixed solutions in the EPIR. - View Dependent Claims (22, 23, 24)
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Specification