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针对BOC调制信号自相关函数多峰值造成的捕获模糊性问题,提出一种基于相关函数的去模糊性捕获算法。该算法能消除接收信号载频的影响;根据BOC伪码的相关函数计算原理构造与收信号相关的两路本地信号;根据相关结果的对称性,通过简单数学运算组成一个完全无模糊性的相关函数。理论分析和仿真结果表明,相比ASPeCT算法及重构相关算法,提出的捕获算法的主峰均值比例更高,副峰均值比例更低。在两径信道中,当时延小于一个码片时,该算法的主峰能量可达100%。利用TMS320C5509A芯片进行算法验证,进一步验证了该算法的有效性。
Aiming at the acquisition ambiguity caused by the multi-peak of autocorrelation function of BOC modulated signal, a de-ambiguity acquisition algorithm based on correlation function is proposed. The algorithm can eliminate the influence of the carrier frequency of the received signal. According to the principle of correlation function calculation of BOC pseudo-codes, two local signals related to the received signal are constructed. Based on the symmetry of the correlation results, a simple unambiguous correlation function. Theoretical analysis and simulation results show that, compared with ASPeCT algorithm and reconstruction related algorithm, the proposed algorithm has a higher proportion of main peaks and a lower proportion of secondary peaks. In the two-path channel, when the delay is less than one chip, the main peak energy of the algorithm can reach 100%. TMS320C5509A chip using algorithm validation, and further verify the effectiveness of the algorithm.