Volume 36, Number 1, February 2018
|Page(s)||176 - 181|
|Published online||18 May 2018|
Design of Unambiguous Combined Tracking Loop for GNSS Complex Subcarrier Signal
State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China
2 School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
Complex subcarrier modulation signal, is a kind of BOC signal which is used complex exponential function as subcarrier, has been widely applied in GNSS(Global Navigation satellite system). The existence of multiple correlation peaks of the autocorrelation function of the complex subcarrier signal, will cause the acquisition error and tracking to the side peak when the signal is synchronized. To solve this problem, an unambiguous combined tracking loop for complex subcarrier signals is proposed. In this loop architecture, the main loop completes the coarse synchronization with BPSK-like algorithm, and the assisted loop realizes the accurate tracking together main loop. In this paper, the dual estimate tracking algorithm and the side-peak cancellation scheme are employed respectively in the assisted loop. The performance of tracking accuracy and anti-multipath capability of the proposed architecture is analyzed, and the practicability is verified by using the actual collected data. Simulation and experimental results show that the tracking structure proposed in this paper is practical and has good performance of anti-noise and anti-multipath.
Key words: GNSS / BOC signal / complex subcarrier / combined tracking loop / auto-correlation
关键字 : 全球卫星导航系统 / BOC信号 / 复子载波 / 组合跟踪环 / 自相关函数
© 2018 Journal of Northwestern Polytechnical University. All rights reserved.
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