Claims
- 1. A method of verifying the validity of a SATPS three satellite solution, comprising:separating the three SATPS satellites into a first pair and a second pair; constructing a primary solution and an alternate solution, wherein the primary solution and the alternate solution satisfy the measurement constraints; computing a Doppler difference estimate for the primary solution and a Doppler difference estimate for the alternate solution; computing Doppler difference residuals for the first pair and the second pair of SATPS satellites; and comparing the Doppler difference residuals for said primary and alternate solutions to determine a valid solution.
- 2. The method of claim 1, wherein the computing of a Doppler difference residuals comprises differencing a measured Doppler difference from an estimated Doppler difference for the first pair and the second pair of SATPS satellites.
- 3. The method of claim 2, wherein the determination of a valid solution comprises comparing the difference between the Doppler difference residuals to a predetermined number.
- 4. The method of claim 3, wherein when the Doppler difference residuals exceed the predetermined number, the alternate solution is selected as the valid solution.
- 5. A method of verifying the validity of a SATPS three satellite solution, comprising:separating the three SATPS satellites into a first pair and a second pair; constructing a primary solution and an alternate solution, wherein the primary solution and the alternate solution satisfy the measurement constraints; computing a Doppler difference estimate for the first pair and the second pair of both the primary and alternate solutions; computing Doppler difference residuals for the first pair and the second pair of SATPS satellites in each solution by subtracted measured doppler differences from the doppler difference estimates; and comparing the Doppler difference residuals for said primary and alternate solutions to determine a valid solution.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority under 35 U. S. C. §119(e) of U.S. Provisional Patent Application No. 60/228,965, filed Aug. 29, 2000, entitled “NAVIGATION PROCESSING FOR A SATELLITE POSITIONING SYSTEM RECEIVER,” by Keith J. Brodie et al., which application is incorporated by reference herein.
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