The navigation performance of the geometric dilution of precision (GDOP) GPS satellite criterion versus an alternate GPS satellite selection criterion for an integrated GPS/INS Navigator in a jamming environment is tested and analyzed. The theoretical development of GDOP and GDOP-based satellite selection criterion are reviewed. From this review a satellite selection criterion known as the cost criterion (which is a combination of noise-weighted GDOP and the a priori covariance weighted least squares position error) is selected for performance testing against a GDOP satellite selection criterion. Performance assessment of the two satellite selection criterion is accomplished using a modified version of the integrated GPS/INS (IGI) Computer Simulation. The IGI Simulator is modified to simulate adaptive band-width control of the satellite tracking loops, the use of a mull steering antenna, the use of an alternate satellite selection criterion, and the effects due to jammers. The performance assessment is based on simulating a single F-4 Close-Air-Support Mission encountering five different jamming scenarios.
Global Positioning System Satellite Selection Evaluation for Aided Inertial Navigation
1983
212 pages
Report
No indication
English
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