INS Alignment Using GPS Phase III User Equipment Computed Corrections

Prasun K. Sinha, Marvin May

Abstract:	Phase III Global Positioning System (GPS) User Equipment (UE) (RCVR3A) is being integrated into a number of Host Vehicle (HV) platforms whose avionics suites include a Mission Computer (MC) and an Inertial Navigation System (INS). In some platforms the memory and through-put constraints reauired to ranidlv estimate ti&s militates against the aliqnment correc- mechanization of a Kalman filter in the MC. In these applications, the INS corrections computed bv the RCVR3A at a 1 Hz rate offers an- alternative means of correcting the INS state vector, and in par- ticular, the INS attitude. This paper presents and discusses results obtained from in-plant tests and simulations conducted to assess the accuracies of the alignment corrections computed by the RCVR3A. Results are presented to demonst- rate the utility of the RCVR3A corrections for two cases which are representative of an INS that has undergone an alignment procedure following start up, and one that has not.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	471 - 481
Cite this article:	Sinha, Prasun K., May, Marvin, "INS Alignment Using GPS Phase III User Equipment Computed Corrections," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 471-481.
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