INTEGRITY OF DIFFERENTIAL GPS CORRECTIONS IN NAVIGATION DEVICES USING MILITARY TYPE GPS RECEIVERS
First Claim
1. A system processor for a navigation system, comprising:
- a GPS ranging system operable to receive GPS ephemeris from at least three GPS satellites;
a DGPS data receiver operable to receive differential GPS data for correction of the GPS ephemeris;
at least one Kalman filter operating alone or in combination, the at least one Kalman filter operable to calculate a navigation solution based on the GPS ephemeris received the GPS ranging system and to calculate a corrected navigation solution based upon the differential GPS data, wherein the Kalman filter uses the differential GPS data;
a mode logic operable to calculate the navigation solution operable to determine whether to select the navigation solution based upon the GPS ephemeris or the corrected navigation solution.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for calculating corrections to a navigation solution based on differential GPS data includes receiving GPS ephemeris from at least three GPS satellites. A PVT solution is resolved from the GPS ephemeris. The PVT solution includes a Circular Error Probable (CEP). Differential GPS data for calculating the corrections to the PVT solution is received. A corrected PVT solution is then based upon the differential GPS data. The corrected PVT solution is compared to an area defined by the CEP. Where the corrected PVT solution is not within the area, the corrected PVT solution is rejected in favor of the PVT solution for determining an accurate navigational solution.
-
Citations
10 Claims
-
1. A system processor for a navigation system, comprising:
-
a GPS ranging system operable to receive GPS ephemeris from at least three GPS satellites; a DGPS data receiver operable to receive differential GPS data for correction of the GPS ephemeris; at least one Kalman filter operating alone or in combination, the at least one Kalman filter operable to calculate a navigation solution based on the GPS ephemeris received the GPS ranging system and to calculate a corrected navigation solution based upon the differential GPS data, wherein the Kalman filter uses the differential GPS data; a mode logic operable to calculate the navigation solution operable to determine whether to select the navigation solution based upon the GPS ephemeris or the corrected navigation solution. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of calculating corrections to a navigation solution based on accurate data, comprising:
-
receiving GPS ephemeris from at least three GPS satellites; resolving a PVT solution from the GPS ephemeris, the PVT solution including a CEP; receiving differential GPS data for calculating the corrections to the PVT solution calculating a corrected PVT solution based upon the differential GPS data; comparing the corrected PVT solution to an area defined by the CEP; and rejecting the corrected PVT solution where the corrected PVT solution is not within the area. - View Dependent Claims (7, 8, 9, 10)
-
Specification