基于伪相关函数的cosine-BOC调制信号无模糊跟踪算法

针对余弦二进制偏移载波（cosine-BOC）调制信号自相关函数的多峰特性会导致导航接收机同步阶段产生跟踪模糊度问题，提出了一种基于伪相关函数（PCF）的cosine-BOC调制信号无模糊跟踪算法。该算法通过分析cosine-BOC信号的时域模型，在本地设计两路辅助信号波形，与接收到的cosine-BOC信号进行相关运算，再将得到的两互相关函数利用伪相关函数表达式进行组合，从而消除cosine-BOC信号自相关函数的边峰。仿真结果表明，该算法能够消除cosine-BOC信号鉴相曲线中存在的误锁点，实现伪码无模糊跟踪，提高跟踪可靠性，且该算法适用于任意阶数的cosine-BOC信号。

An unambiguous tracking algorithm based on pseudo correlation function for cosine-BOC modulation signals

The multiple side-peak characteristics of the cosine-BOC(Binary Offset Carrier) modulation signal autocorrelation function will lead to ambiguous tracking in the synchronization process for the navigation receiver.Therefore,an unambiguous tracking algorithm based on Pseudo Correlation Function(PCF) for cosine-BOC modulation signals is proposed.In the algorithm two auxiliary signal waveforms are designed by analyzing the time domain model of cosine-BOC signal.The cross-correlation functions between the received cosine-BOC signal and the two auxiliary signals are combined by using PCF expression so as to eliminate the side-peaks of the cosine-BOC signal autocorrelation function.The simulation results show that the algorithm can eliminate the false-lock points of the cosine-BOC signal phase discriminator curve,achieve unambiguous tracking and improve the tracing reliability,and the algorithm is applicable to any order cosine-BOC signal.