A Modified Adaptive Bandwidth Algorithm for Optimal Signal Tracking of DGPS Reference Receivers

Sang Hyun Park, Deuk Jae Cho, Sang Hyun Suh, Deok Won Lim and Sang Jeong Lee

Abstract:	A narrow loop noise bandwidth method is desirable to reduce the error of raw measurements due to the thermal noise. However, it degrades the performance of GPS initial synchronization such as mean acquisition time. And it restricts the loop noise bandwidth to a fixed value determined by the lower bound of the allowable range of carrier-to-noise power ratio, so that it is difficult to optimally track GPS signal. In order to make up for the weak points of the fixed-type narrow loop noise bandwidth method and simultaneously minimize the error of code and carrier measurements, this paper proposes a modified adaptive bandwidth algorithm for DGPS reference receivers. In this paper, it is shown that the modified adaptive bandwidth algorithm can provide more accurate measurements than those of the fixed-type narrow loop noise bandwidth method from comparison analysis to differences in simulation results between two signal tracking algorithms. This paper also carries out sensitivity analysis of the modified adaptive bandwidth algorithm due to the estimation uncertainty of carrier-tonoise power ratio. Finally the analysis results are verified by the experiment using GPS simulator.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	720 - 727
Cite this article:	Park, Sang Hyun, Cho, Deuk Jae, Suh, Sang Hyun, Lim, Deok Won, Lee, Sang Jeong, "A Modified Adaptive Bandwidth Algorithm for Optimal Signal Tracking of DGPS Reference Receivers," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 720-727.
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