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针对二进制偏移载波(BOC)调制信号自相关多峰特性引起的信号捕获模糊性问题,提出了一种子相关相乘边峰消除技术(CMSCT)。根据BOC子相关函数的特性,通过将不同子相关函数相乘获得边峰消除能力,并且为了充分利用接收信号,进一步提高捕获性能,提出了相应的优化算法。分析对比了提出算法的实现复杂度和基于恒虚警率准则的峰值发现概率,对Galileo E1C中频采样信号的处理结果表明:提出的边峰消除方法有效解决了捕获模糊性问题。
Aiming at the problem of signal acquisition ambiguity caused by autocorrelation multi-peak characteristics of binary offset carrier (BOC) modulated signals, a subscenter-multiplication side-peak cancellation technique (CMSCT) is proposed. According to the characteristics of the BOC sub-correlation function, the side-peak elimination ability is obtained by multiplying different sub-correlation functions, and in order to make full use of the received signal and further improve the acquisition performance, a corresponding optimization algorithm is proposed. The complexity of the algorithm and the probability of peak detection based on constant CFAR are analyzed and compared. The processing results of the Galileo E1C IF signal show that the proposed edge cancellation method can effectively solve the problem of acquisition ambiguity.