Navigation Bias Shifts Due to GPS Constellation Changes

F.S.G. Von Zuben and C.T. Marlow

Abstract:	The paper is an effort to analyze guidance errors arising from the use of two independent navigation systems utilized for a host targeting solution and a weapon. The analysis investigates the scenario for differing GPS constellations tracked by the two systems versus relative targeting techniques which force both systems to track the same satellites. Furthermore, the analysis investigates the reduction in the bias shift observed between the two systems as a result both of (1) using Wide Area GPS Enhancement corrections in the formulation of the pseudo-range observables processed by the navigation filter and of (2) using all-in-view GPS receivers. An analytical expression for the one-sigma error in the bias shift is derived. A constellation model is utilized to generate dilutions of precision for various latitudes. The minima, maxima, and means for the various dilutions of precision are utilized by the derived equations to quantify the effective statistical error. Results of the effective hand-off error between the two systems are provided to support design decisions incurred when employing precision guided munitions.
Published in:	Proceedings of the 2006 National Technical Meeting of The Institute of Navigation January 18 - 20, 2006 Hyatt Regency Hotel Monterey, CA
Pages:	1064 - 1067
Cite this article:	Von Zuben, F.S.G., Marlow, C.T., "Navigation Bias Shifts Due to GPS Constellation Changes," Proceedings of the 2006 National Technical Meeting of The Institute of Navigation, Monterey, CA, January 2006, pp. 1064-1067.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In