Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22369
Title: Low C/N0 Carrier Tracking Loop Based on Optimal Estimation Algorithm in GPS Software Receivers
Authors: Miao, J
Chen, W 
Sun, Y
Liu, J
Keywords: global positioning system
Kalman filters
phase locked loop
signal processing
software radio
Issue Date: 2010
Publisher: Elsevier Science Inc
Source: Chinese journal of aeronautics, 2010, v. 23, no. 1, p. 109-116 How to cite?
Journal: Chinese Journal of Aeronautics 
Abstract: Suppressing jitter noises in a phase locked loop(PLL) is of great importance in order to keep precise and continuous track of global positioning system(GPS) signals characterized by low carrier-to-noise ratio(C/N0). This article proposes and analyzes an improved Kalman-filter-based PLL to process weak carrier signals in GPS software receivers. After reviewing the optimal-bandwidth-based traditional second-order PLL, a Kalman-filter-based estimation algorithm is implemented for the new PLL by decorrelating the model error noises and the measurement noises. Finally, the efficiency of this new Kalman-filter-based PLL is verified by experimental data. Compared to the traditional second-order PLL, this new PLL is in position to make correct estimation of the carrier phase differences and Doppler shifts with less overshoots and noise disturbances and keeps an effective check on the disturbances out of jitter noises in PLL. The results show that during processing normal signals, this improved PLL reduces the standard deviation from 0. 010 69 cycle to 0. 007 63 cycle, and for weak signal processing, the phase jitter range and the Doppler shifts can be controlled within ±17° and ±5 Hz as against ±25° and ±15 Hz by the traditional PLL.
URI: http://hdl.handle.net/10397/22369
DOI: 10.1016/S1000-9361(09)60194-1
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