LN-200G First SAASM Based Tactical Grade INS/GPS Navigator

C. P. Bruner

Abstract:	This paper describes the design and development of the LN-200G, a tactical grade INS/GPS that addresses the design practices of the USAF JPO GRAM and SAASM directives. The LN-200G combines the proven Litton LN-200 IMU, which is based on an all solid-state-sensor assembly consisting of Interferometric Fiber Optic Gyros (IFOG) and all silicon micro-machined (MEMS) accelerometers, with a GRAM/SAASM based military grade P/Y code GPS receiver and navigation processor. The unit, which is packaged in a small 41-cubic inch 2.0- pound assembly, is capable of performing over the extreme temperature and vibration environments characteristic of military applications. The IMU and GPS measurements are combined in a tightly coupled navigation solution hosted in the SAASM application microprocessor. The unit features synchronous operation of the IMU and GPS receiver to a common time base and inertial aiding of the receiver carrier and code tracking loops to ensure maximum performance in the presence of intentional or incidental interference. The GPS receiver is an L1/L2 P(Y) code-capable unit that features a high performance massive correlator-based acquisition engine, which allows extremely fast acquisition of the C/A and P(Y) code, even in the face of hostile jamming and high vehicle dynamics. The unit provides outputs of attitude, vehicle body rates and acceleration, as well as INS/GPS and GPS-only position, velocity, and UTC time. All dynamic outputs are tagged with UTC or internal time. Laboratory testing using dynamic IMU and GPS RF simulated inputs and live satellites has been performed; results from live satellite testing is presented.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	2061 - 2069
Cite this article:	Bruner, C. P., "LN-200G First SAASM Based Tactical Grade INS/GPS Navigator," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 2061-2069.
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