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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 |
Issue Date: | 2010 | Source: | Chinese journal of aeronautics, 2010, v. 23, no. 1, p. 109-116 | 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. | Keywords: | global positioning system Kalman filters phase locked loop signal processing software radio |
Publisher: | Elsevier Science Inc | Journal: | Chinese Journal of Aeronautics | DOI: | 10.1016/S1000-9361(09)60194-1 | Rights: | © 2010 Elsevier Ltd. Open access under CC BY-NC-ND license ((http://creativecommons.org/licenses/by-nc-nd/4.0/). The following publication Jianfeng, M., Wu, C., Yongrong, S., & Jianye, L. (2010). Low C/N0 carrier tracking loop based on optimal estimation algorithm in GPS software receivers. Chinese Journal of Aeronautics, 23(1), 109-116 is available at https://doi.org/10.1016/S1000-9361(09)60194-1 |
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