In this paper, we propose an efficient method for eliminating ambiguity in the acquisition and tracking processes of binary offset carrier (BOC)‐modulated signals. Our contribution is realized in two stages. The first one is based on the use, at the receiver end, of optimized locally generated subcarrier sequences to get a completely unambiguous composite correlation function (CF). This first stage is used to initialize and control the second stage of the proposed method designed on the basis of a maximum likelihood algorithm (MLA) to mitigate, specifically, multipath (MP) effect. In fact, the idea is to combine, in this second stage, the received signal (affected by noise and MP) with a set of locally generated ideal BOC(m,n)‐modulated signals, which are delayed and weighted by the MLA‐estimated parameters of delays, amplitudes, and phases of all the MP signals, to obtain an unambiguous CF with better performance. The simulation results, based on MATLAB tool, have demonstrated that the proposed method effectively eliminates the ambiguity problem. Besides, a comparative study with several methods has shown that the proposed method grants better performance than the most popular techniques.

中文翻译：

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DLL BOC信号跟踪的明确方法

在本文中，我们提出了一种有效的方法来消除二进制偏移载波（BOC）调制信号的采集和跟踪过程中的歧义。我们的贡献分两个阶段实现。第一个是基于在接收器端使用优化的本地生成的子载波序列以获得完全明确的复合相关函数（CF）。该第一阶段用于初始化和控制根据最大似然算法（MLA）设计的拟议方法的第二阶段，以减轻，特别是减轻多径（MP）效应。实际上，这个想法是在第二阶段将接收到的信号（受噪声和MP影响）与一组本地生成的理想BOC（m，n）调制信号进行组合，这些信号由MLA-延迟并加权估计的延迟，振幅参数 所有MP信号的相位和相位，以获得性能更好的明确CF。基于MATLAB工具的仿真结果表明，该方法有效消除了歧义问题。此外，对几种方法的比较研究表明，所提出的方法比最流行的技术具有更好的性能。