초록 ▼

A system and method of detecting and correcting for cycle slip in a GPS attitude determination system is presented. The method employs several techniques for detecting and correcting for faults in high integrity carrier phase-related applications. A delta single difference is used as a primary measu

A system and method of detecting and correcting for cycle slip in a GPS attitude determination system is presented. The method employs several techniques for detecting and correcting for faults in high integrity carrier phase-related applications. A delta single difference is used as a primary measurement residual in detecting cycle slip. The delta single difference represents the difference in phase of a carrier signal of a GPS satellite at two receiving antennas over two points in time. This delta single difference is compared to a detection failure threshold computed based on certain high integrity needs. Satellites showing a failure are excluded. In addition, satellites that fail a detectability test, indicating the inability to detect a fault, are pre-excluded from attitude solution computation. When re-resolving integer ambiguities associated with fault detection and correction, the method ensures that the integer ambiguity is resolvable via a resolvability algorithm before implementing a solution-based integer ambiguity resolution.

대표청구항 ▼

[ What is claimed is:] [9.] An apparatus for detecting and correcting cycle slip in a GPS attitude determination system having a plurality of satellites, comprising:means for establishing detectability criteria;means for testing the detectability of said plurality of satellites using said detectabil

[ What is claimed is:] [9.] An apparatus for detecting and correcting cycle slip in a GPS attitude determination system having a plurality of satellites, comprising:means for establishing detectability criteria;means for testing the detectability of said plurality of satellites using said detectability criteria to establish non-detectable satellites;means for tagging non-detectable satellites for pre-exclusion;means for establishing resolvability criteria;means for testing resolvability of ambiguities associated with satellites tagged for pre-exclusion and post-exclusion to establish resolvable satellites;means for resolving ambiguities associated with satellites tagged for pre-exclusion and post-exclusion only if they are resolvable based on said testing.