An Option for Mechanizing Integrated GPS/INS Solutions

J. Arnold Saltz, James I. Donna, Richard L. Greenspan

Abstract:	The GPS Joint Program Office (JPO) has directed Rockwell-Collins to deliver GPS User Equipment incorporating standard hardware and software. The resulting package, RCVR-3A, is designed to provide specified navigation performance under a wide range of alternative avionics interface requirements and aircraft mission scenarios. However, various integration studies have demonstrated that some potential performance of the RCVR-3A is not realized because of the software design compromises made to accommodate the standardization requirements, particularly when GPS measurements are integrated with INS outputs in RCVR-3A INS-mode operation. Therefore, some integrators have chosen to mechanize an independent navigation filter in a host vehicle mission computer when their system requirements exceed the GPS Specifications. An alternative approach is to provide custom tuning for the RCVR-3A navigation filter to improve the receiver's own estimates of velocity and platform alignment. This paper summarizes the results of studies which indicate that filter tuning is a cost- effective approach for certain combinations of INS and aircraft mission requirements. The paper concludes with a discussion of alternative means to mechanize the RCVR-3A retuning. Rockwell Collins is currently investigating procedures to implement retuning.
Published in:	Proceedings of the 44th Annual Meeting of The Institute of Navigation (1988) June 21 - 23, 1988 U.S. Naval Academy Annapolis, Maryland
Pages:	124 - 129
Cite this article:	Saltz, J. Arnold, Donna, James I., Greenspan, Richard L., "An Option for Mechanizing Integrated GPS/INS Solutions," Proceedings of the 44th Annual Meeting of The Institute of Navigation (1988), Annapolis, Maryland, June 1988, pp. 124-129.
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