Analysis of Discriminator Based Vector Tracking Algorithms

Matthew Lashley and David M. Bevly

Abstract:	In this paper, a variant of the vector delay lock loop (VDLL) tracking algorithm for tracking the L1 civilian GPS signal is introduced. The algorithm functions on the principle originally described in [1]. The VDLL architecture uses a single Extended Kalman Filter to predict the satellite PRN code phase and track the user’s position, velocity, and clock states. Additionally, a series of separate Kalman filters is used by each channel to track the satellite carrier signal. The advantages of the vector/Kalman filter based architecture over traditional methods are explained. The ability of the vector tracking algorithms to rapidly reacquire blocked signals is analyzed using data produced by a Spirent GPS simulator. The vector tracking algorithms performance is also compared to traditional methods using tracking loops. The VDLL is shown to outperform the traditional methods.
Published in:	Proceedings of the 2007 National Technical Meeting of The Institute of Navigation January 22 - 24, 2007 The Catamaran Resort Hotel San Diego, CA
Pages:	570 - 576
Cite this article:	Lashley, Matthew, Bevly, David M., "Analysis of Discriminator Based Vector Tracking Algorithms," Proceedings of the 2007 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2007, pp. 570-576.
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