Vector Delay/Frequency Lock Loop Implementation and Analysis

Matthew Lashley and David M. Bevly

Abstract:	This paper deals with the advantages in thermal noise performance of vector-based GPS tracking algorithms over traditional receiver architectures. The concept and operation of two different vector tracking algorithms are explained. Specifically, the Vector Delay Lock Loop (VDLL) and Vector Delay/Frequency Lock Loop (VDFLL) are discussed. The similarities between vector tracking loops and scalar tracking loops are discussed. The reasons why vector tracking loops perform better than scalar tracking loops is also covered. The thermal noise performance of the VDLL and VDFLL is analyzed using rule of thumb tracking thresholds. A covariance analysis is used to predict the lowest Carrier to Noise power density ratio (C/N0) at which the vector tracking algorithms can operate. The results of the covariance analysis are verified through Monte Carlo simulations of the vector tracking algorithms. Overall, the results of the analysis match well with the Monte Carlo simulation results.
Published in:	Proceedings of the 2009 International Technical Meeting of The Institute of Navigation January 26 - 28, 2009 Disney's Paradise Pier Hotel Anaheim, CA
Pages:	1073 - 1086
Cite this article:	Lashley, Matthew, Bevly, David M., "Vector Delay/Frequency Lock Loop Implementation and Analysis," Proceedings of the 2009 International Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2009, pp. 1073-1086.
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