余弦相位BOC信号互相关延迟无模糊跟踪方法

Cross-correlation Delay Unambiguous Tracking Method for Cosine-phased BOC Signals

二进制偏移载波调制信号(Binary Offset Carrier,BOC)是具有高精度和抗多径潜质的导航信号,然而余弦相位BOC(Cosine-phased BOC,CosBOC)信号的自相关函数(Auto-correlation Function,ACF)的复杂多峰易引起跟踪模糊且难以消除。根据CosBOC信号形状码向量设计出本地辅助信号,与接收到信号相关运算形成子互相关函数,再进行延迟移位、线性组合和非线性处理获得无模糊相关函数,从而消除副峰并实现无模糊跟踪。针对CosBOC(10,5)的仿真结果表明,当载噪比大于27 dB-Hz时,该方法的码跟踪精度优于类二进制相位键控(Binary Phase Shift Keying Like,BPSK Like)法和伪相关函数(Pseudo-correlation Function,PCF)法,且该方法的多径误差包络面积小于BPSK Like方法和PCF方法。

The cosine-phased binary offset carrier(BOC)signal is a navigation signal with high precision and anti-multipath potential ability.However,the tracking ambiguity which is easily caused by the complex multi-peaks of cosine-phased BOC(CosBOC)signal’s auto-correlation function is difficult to eliminate.The auxiliary signals are designed for CosBOC signal according to the shape code vectors,to form sub-cross-correlation functions with the received signal through correlation operation,then the unambiguous correlation function which can eliminate the side peaks and realize the unambiguous tracking can be obtained by the delaying,linear combination and nonlinear processing.The simulation results for CosBOC(10,5)demonstrate that when the carrier-to-noise ratio is higher than 27 dB-Hz,the code tracking performance of the proposed method is better than those of the binary phase shift keying like(BPSK Like)method and pseudo-correlation function(PCF)method,and the multipath error envelope area of the proposed method is generally smaller than those of the BPSK Like method and the PCF method.