BOC(2n,n)信号码跟踪环多径误差分析

Multipath error analysis on the code tracking loop for BOC(2n,n) signals

针对多径信号引起跟踪环多径误差的问题,基于经典接收机跟踪环结构,从鉴别函数分析着手,对BOC(2n,n)信号的码多径误差解析式进行推导,给出了多径误差与多径参数的变化关系,并分析了前置滤波带宽对BOC(2n,n)信号的多径误差包络的影响,Matlab仿真结果验证了理论推导的正确性,证明了窄相关技术能提供良好的码多径误差抑制性能,BOC信号码速率越高,抗多径性能越好,并且增加前置滤波带宽能有效改善信号抗多径性能。

In view of the error aroused by the multipath signal in the code tracking loop, based on a classic receiver tracking loop structure, the code multipath expressions for BOC（2n,n） signals is deduced by analyzing the code discriminator func- tion, the relation between the multipath error and multipath parameters is demonstrated, and the influence of different front- end bandwidth on the multipath envelop is studied. The correctness of the theoretical deduction is proved by Matlab simula tion results, the narrow correlator can provide a favorable multipath mitigation performance and the mitigation performance becomes better when the code rate is increased. Additionally, the performance of multipath inhibition can be improved with larger front-end bandwidth.