Accession Number : ADA138070

Title :   Global Positioning System Satellite Selection Evaluation for Aided Inertial Navigation.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Vaccaro,P M

PDF Url : ADA138070

Report Date : Dec 1983

Pagination or Media Count : 212

Abstract : 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.

Descriptors :   *Inertial navigation, *Global positioning system, Navigational aids, Navigation satellites, Computerized simulation, Satellite attitude, Satellite networks, Integrated systems, Jamming, Steerable antennas, Theses

Subject Categories : Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE