Integrated Navigation System Design and Performance With Phase III GPS User Equipment

P. Sinha, K. Barckley, D. deDoes

Abstract:	During Phase III of the Global Positioning System (GPS) program, User Equipment (UE) will be integrated into a variety of Host Vehicle (HV) platforms whose avionics suites may likely contain a Mission Computer (MC) and at Inertial Navigation System (INS). In order to maximize the synergistic benefits of integrating the UE with an INS, the integration concept most likely to be adopted is one in which the UE will function as an INS aided Position, Velocity, Time (PVT) sensor. This paper discusses two basic ways of utilizing GPS PVT data to maintain the system navigation solution: (a) by periodic reinitialization of the INS solution to the GPS solution, and (b) as measurements to a navigation filter resident in the MC. To successfully implement these schemes an integrator must be aware of Phase II UE design characteristics and the ramifications of closed loop operation with both an INS and a MC. The specific objective of this paper is, then, to discuss pertinent closed loop design issues and to demonstrate performance of both the UE and the system navigation solutions. Specifically, results are presented to assess design impacts due to the following: Phase III UE INS reset reporting policy (value and announced), the interval between INS resets end the rates at which UE PV data are incorporated into the M:'s navigation filter, and the type of UE data processed by the M: (P, V, and INS platform tilt estimates) . Both simulated and real. data are presented to demonstrate closed loop navigation operation under conditions of optimum satellite geometry and during a PDOP "hole". Simulated data is provided by detailed models of both Receiver 3A an:J a three-axes local level INS operating in closed loop with a 14 state Kalman filter that includes coupled horizontal and vertical states. Real data is obtained from Receiver 3A laboratory test cases.
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:	283 - 300
Cite this article:	Sinha, P., Barckley, K., deDoes, D., "Integrated Navigation System Design and Performance With Phase III GPS User Equipment," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 283-300.
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