An Integrated INS/GPS Navigation System Using Carrier Phase

Neil P. Hansen and Robert Riggins

Abstract:	Currently the Central Inertial Guidance Test Facility (CIGTF), 46th Test Group, located at Holloman AFB in New Mexico, is developing the CIGTF High Accuracy Post-processing reference System (CHAPS). CHAPS is a multi-sensor navigation reference system which augments the navigation solution of a Litton LN-93 Inertial Navigation System (INS) with measurements from the Global Positioning System (GPS) and a Range and Range-rate System (RRS) of ground transponders in a post-processing Extended Kalman Filter (EKF). CHAPS is based on simulation studies performed at the Air Force Institute of Technology (AFIT), Wright- Patterson AFB in Ohio, of an integrated INS/GPS/RRS filter called the Navigation Reference System (NRS). CHAPS will be used by the Air Force as a high accuracy reference system for flight test evaluations of GPS receivers, INS’s, and other navigation systems. Development of CHAPS is to include incorporation of Carrier Phase GPS measurements with the goal of achieving sub-meter accuracies during flight test evaluations. Research performed by the authors at AFIT investigated the performance enhancement of the NRS filter by adding carrier phase GPS measurements. The resulting simulation model, known as the Precision Navigation Reference System (PNRS), was evaluated against the NRS filter and the Enhanced Navigation Reference System (ENRS) filter which utilizes differential GPS. The PNRS filter was also subjected to simulated large and small carrier phase cycle slips in order to study its performance. This paper presents the development and results of the AFIT PNRS simulations.
Published in:	Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994) June 6 - 8, 1994 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	169 - 177
Cite this article:	Hansen, Neil P., Riggins, Robert, "An Integrated INS/GPS Navigation System Using Carrier Phase," Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994), Colorado Springs, CO, June 1994, pp. 169-177.
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