Method for maintaining integrity against erroneous ephemeris for a differential GPS based navigation solution supporting fast system startup
AssigneeRaytheon Company
InventorsStephen R. Peck, Shuwu Wu
Life of this patent
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Abstract
Technology for generating a H1 protection level from an N−1 position in a global positioning system (GPS) receiver is disclosed. One approach can include an H1 monitor configured to generate an H1 protection level from an N number of N−1 positions. The N−1 position can be derived by a differential global positioning system (GPS) satellite measurement removed from a plurality of N differential GPS satellites measurements.
Claims20
A relative navigation processor, comprising:
- an H1 monitor configured to generate an H1 protection level from an N number of N−1 positions, wherein an N−1 position is derived by a differential global positioning system (GPS) satellite measurement removed from a plurality of N differential GPS satellites measurements,
- wherein the H1 monitor is configured as an ephemeris H1 monitor operable to provide integrity protection against a single source GPS ephemeris fault in differential GPS positioning by generating an H1 and final protection level from the N number of N−1 positions, wherein each differential GPS satellite measurement includes ephemeris information for a GPS satellite.
A method for generating a H1 protection level from an N−1 position in a global positioning system (GPS) receiver, comprising:
- under control of one or more computer systems configured with executable instructions:
- generating an H1 protection level from an N−1 position, wherein the N−1 position is derived by removing a differential measurement from a specified global positioning system (GPS) satellite in a plurality of GPS satellites from differential measurements of the plurality of GPS satellites, and differential measurements from a GPS satellite include ephemeris information for the GPS satellite.
A system for generating a H1 protection level from an N−1 position, comprising:
- an user global positioning system (GPS) receiver configured to receive ephemeris information from a plurality of N GPS satellites, and receive a position of at least one reference GPS receiver, wherein the user GPS receiver moves independently of the at least one reference GPS receiver;
- and
- a differential global positioning system (DGPS) processor within the user GPS receiver, the processor storing instructions that, when executed by the processor, cause the processor to generate an H1 protection level from an N−1 position, wherein the N−1 position is derived from differential measurements from a plurality of N−1 GPS satellites, and N GPS satellites are in view, and differential measurements from a GPS satellite in the plurality of N GPS satellites include ephemeris information for the GPS satellite.
Dependencies are inferred from the claim text.