Methods and apparatus for geometry extra-redundant almost fixed solutions
First Claim
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1. A method, comprising:
- combining 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, using a processor, protection levels for providing a relative GPS navigation solution 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
22 Claims
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1. A method, comprising:
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combining 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, using a processor, protection levels for providing a relative GPS navigation solution 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, using a processor, 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, using a processor, 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; 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 (11, 12, 13, 14)
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15. 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 for relative GPS navigation including effects of incorrect fixes associated with the almost fixed solutions in the EPIR. - View Dependent Claims (16, 17, 18)
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19. An article, comprising:
- computer readable instructions stored thereon that enable a machine to perform the steps of;
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 for providing a relative GPS navigation solution including effects of incorrect fixes associated with the almost fixed solutions in the EPIR. - View Dependent Claims (20, 21, 22)
- computer readable instructions stored thereon that enable a machine to perform the steps of;
Specification