GPS Based TSPI for DOD Ranges RAJPO HDIS Test Results

Samuel Burkett III, Mohammed Miran, Sultan Mahmood, Jeannine Yakaboski, and Frank Fieldson

Abstract:	The RAJPO at Eglin AFB has acquired a family of GPS- based equipment to determine highly accurate Time Space Position Information (TSPI) for the DOD tri-service test and training ranges. The High Dynamic Instrumentation Set (HDIS), developed by Interstate Electronics Corporation (IEC) and produced by IEC and Metric Systems Corporation, is a fully authorized P-code receiver that can operate in real-time differential mode with or without inertial aiding. The HDIS was proven ready for usage by extensive flight test accuracy results using F-15 and F-16 aircraft. Flight tests were conducted by the Eglin AFB 46th Test Wing using the B-70 instrumented test range and the Eglin AFB data link. The HDIS was evaluated under conditions of sustained high Gs (less than 10) and intermittent satellite visibility. The flight test scenarios include such profiles as double circles, figure eights, racetracks, cuban eights, climb and dives, aileron rolls, and barrel rolls. The tests were designed to stress the GPS inertially aided tracking and navigation algorithms through various linear and rotational dynamics. The HDIS solution was compared against the Test Data Optimal Processor (TDOP) truth trajectory, which consolidates TSPI from cinetheodolites, laser trackers, and aircraft inertial navigation systems (IN%). The accuracy determination process considered the individual truth data sensor error contributions as well as nonoptimum dilution of precision satellite geometry. This paper briefly describes the HDIS, the accuracy test program, the test data reduction methodologies, and the statistical results demonstrating specification compliance. The test results in this paper clearly show the HDIS accuracy exceeds the specified requirement in all modes of operation, including aided, unaided, absolute, and differential. *In the most stringent specified mode of operation (differential with inertial aiding), the HDIS achieved real-time position specification compliance accuracies of 2.3 feet and 3.7 feet in the horizontal and vertical directions, respectively. The HDIS also achieved velocity accuracies of 0.4 feet per second in both horizontal and vertical directions. This performance is better than the specification for position by a factor of 3 and velocity by a factor of 6.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	765 - 772
Cite this article:	Burkett, Samuel, III, Miran, Mohammed, Mahmood, Sultan, Yakaboski, Jeannine, Fieldson, Frank, "GPS Based TSPI for DOD Ranges RAJPO HDIS Test Results," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 765-772.
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