Simulated Performance Analysis of a Composite Vector Tracking and Navigation Filter

Christopher R. Hamm and David M. Bevly

Abstract:	This paper presents an alternative GPS signal tracking method which uses an extended Kalman-Bucy filter in place of traditional independent, parallel tracking loops. Furthermore, this method is extended into a combined tracking and navigation filter coupled with inertial aiding. This approach reduces filter design complexity significantly and allows for optimal navigation performance in a variety of conditions. Specifically, the proposed method is demonstrated under high dynamics while experiencing significant levels of jamming. A simulation in a single-axis configuration was used to compare the proposed method to an existing aided fixed-gain method to ascertain the expected level of anti-jam performance as well as immunity to dynamic stress. Results from this simulation indicate a nominal expected positioning performance improvement of 5 meters with improvements of up to 25 meters in some cases. A simulation comparing IMU’s of differing grades was also run to ascertain the proposed method’s dependence upon inertial sensor quality.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	478 - 487
Cite this article:	Hamm, Christopher R., Bevly, David M., "Simulated Performance Analysis of a Composite Vector Tracking and Navigation Filter," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 478-487.
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