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<p>The Binary Offset Carrier (BOC) modulated signal, widely implemented in Global Navigation Satellite System (GNSS), has the potential for high accuracy tracking, which is however vulnerable to secondary peak lock. To solve this issue, two-Dimensional (2-D) unambiguous tracking techniques that utilize independent code and subcarrier tracking loops to separately process spreading code and subcarrier components of BOC signals have attracted great attention. However, existing studies indicate that the 2-D Cross-Correlation Functions (CCF) of BOC signals are distorted and asymmetric, causing additional tracking errors. The coupling effect between code and subcarrier loops can degrade performance of 2-D tracking techniques, especially in complex environments. To solve this issue, this paper proposes a decoupled 2-D unambiguous tracking technique. Performance analysis indicates that the proposed method can effectively decouple code and subcarrier tracking loops, thereby preventing additional discrimination and tracking errors. Furthermore, simulation results demonstrate that the proposed method can achieve faster tracking convergence and reduce tracking jitters in complex dynamic scenarios, effectively improving the performance of 2-D tracking techniques.</p>

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Decoupled two-dimensional unambiguous tracking for BOC signals in GNSS

  • 期刊论文

  • 发表日期：

    2025年6月29日

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  • Yunhan Qi,
  • Zheng Yao,
  • Mingquan Lu

摘要

The Binary Offset Carrier (BOC) modulated signal, widely implemented in Global Navigation Satellite System (GNSS), has the potential for high accuracy tracking, which is however vulnerable to secondary peak lock. To solve this issue, two-Dimensional (2-D) unambiguous tracking techniques that utilize independent code and subcarrier tracking loops to separately process spreading code and subcarrier components of BOC signals have attracted great attention. However, existing studies indicate that the 2-D Cross-Correlation Functions (CCF) of BOC signals are distorted and asymmetric, causing additional tracking errors. The coupling effect between code and subcarrier loops can degrade performance of 2-D tracking techniques, especially in complex environments. To solve this issue, this paper proposes a decoupled 2-D unambiguous tracking technique. Performance analysis indicates that the proposed method can effectively decouple code and subcarrier tracking loops, thereby preventing additional discrimination and tracking errors. Furthermore, simulation results demonstrate that the proposed method can achieve faster tracking convergence and reduce tracking jitters in complex dynamic scenarios, effectively improving the performance of 2-D tracking techniques.