A Valid Comparison of Vector and Scalar Tracking Loops

M. Lashley, D.M. Bevly, J.Y. Hung

Abstract:	This paper analyzes the benefits offered by vector tracking loops relative to scalar tracking loops. A method for designing equivalent scalar and vector tracking loops is first introduced. The benefits of vector tracking are then determined by comparing the two equivalent algorithms. The improvements in signal tracking afforded by vector tracking are quantified in different scenarios using covariance analysis and Monte Carlo simulations. The vector tracking algorithms show a maximum improvement in tracking threshold of 6.2 dB with an eleven satellite constellation and a minimum improvement of 2.4 dB with a five satellite constellation. The results presented in this paper demonstrate the amount of improvement vector tracking can provide in different situations. Furthermore, the analysis technique used to design the equivalent tracking loops provides a simple way to compare other attributes of the algorithms, such as their multipath immunity and robustness. Keywords—GPS; vector tracking; vector delay lock loop; vector frequency lock loop; deep integration; ultra-tight coupling
Published in:	Proceedings of IEEE/ION PLANS 2010 May 4 - 6, 2010 Renaissance Esmeralda Resort & Spa Indian Wells, CA
Pages:	464 - 474
Cite this article:	Lashley, M., Bevly, D.M., Hung, J.Y., "A Valid Comparison of Vector and Scalar Tracking Loops," Proceedings of IEEE/ION PLANS 2010, Indian Wells, CA, May 2010, pp. 464-474. https://doi.org/10.1109/PLANS.2010.5507215
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