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论文:2018,Vol:36,Issue(1):176-181 |
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引用本文： |
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罗显志, 赵宏伟, 闫浩. 基于复子载波信号无模糊跟踪的组合环路设计[J]. 西北工业大学学报 |
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Luo Xianzhi, Zhao Hongwei, Yan Hao. Design of Unambiguous Combined Tracking Loop for GNSS Complex Subcarrier Signal[J]. Northwestern polytechnical university |
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| 基于复子载波信号无模糊跟踪的组合环路设计 |
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| 罗显志1, 赵宏伟2, 闫浩2 |
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1. 卫星导航系统与装备技术国家重点实验室, 河北 石家庄 050081;
2. 西北工业大学 电子信息学院, 陕西 西安 710072 |
| 摘要: |
| 复子载波信号是指采用方波复指数函数作为子载波调制的BOC信号，目前已经被广泛应用于全球卫星导航系统。复子载波信号的自相关函数存在多个相关值，在信号同步时会产生信号误捕和跟踪到旁峰的问题。为此，提出了一种适用于复子载波信号的组合跟踪环结构，其中主环采用常规的BPSK-like算法实现信号的初始同步，辅助环分别采用双重估计跟踪算法和旁峰消除算法，与主环共同完成高精度跟踪。首先给出双重估计跟踪算法和旁峰消除算法在此组合环结构下的实现。然后利用仿真数据从跟踪精度和抗多径能力两方面对辅助跟踪环的性能进行分析，并利用实测数据对此环路结构的实用性进行检验。仿真和实测数据跟踪结果表明，提出的辅助组合跟踪结构切实可行并具有较好的抗噪声和抗多径性能。 |
| 关键词:
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
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| Design of Unambiguous Combined Tracking Loop for GNSS Complex Subcarrier Signal |
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| Luo Xianzhi1, Zhao Hongwei2, Yan Hao2 |
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1. 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 |
| Abstract: |
| 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
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| 收稿日期: 2017-03-08
修回日期:
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| DOI: |
| 基金项目: 国家自然科学基金（61771393）资助 |
| 通讯作者:
Email： |
| 作者简介: 罗显志(1976-),卫星导航系统与装备技术国家重点实验室高级工程师,主要从事导航信号分析与评估研究。
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| 作者相关文章 |
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| 罗显志 在本刊中的所有文章 |
| 赵宏伟 在本刊中的所有文章 |
| 闫浩 在本刊中的所有文章 |
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参考文献: |
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