GPS Hover Position Sensing System

P. Okunieff, J. D. Antonitis, J. Green, R. Hogaboom, P. Slonaker, L. Wiederholt, I. Levine

Abstract:	The feasibility of a GPS Hover Position Sensing System capable of providing relative horizontal position accuracy to within one meter (CEP) for three minutes during a hover mission was Investigated. The authors unique approach to both the real·time data collection and the navigation processing combined with a navigation sensor suite consisting of a GPS receiver and an ASN 141 Inertial Navigation System permits this stringent relative position requirement to be met. Real time data recording involved software and hardware design and development methods for collecting and time synchronizing GPS and INS ratio measurements and "true" hover position information. Modifications to existing GPS navigation algorithms were required: process and measurement noise definition and tuning, satellite selection, and ionospheric delay compensation. The validity of the processing algorithms were evaluated using monte carlo simulation techniques and actual flight data. The results show that 1.3 meter accuracy is achievable with GPS in spite of large HDOPs and no ionospheric correction data.
Published in:	Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988) September 19 - 23, 1988 The Broadmoor Hotel Colorado Spring, CO
Pages:	187 - 191
Cite this article:	Okunieff, P., Antonitis, J. D., Green, J., Hogaboom, R., Slonaker, P., Wiederholt, L., Levine, I., "GPS Hover Position Sensing System," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 187-191.
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