一种二进制偏移载波信号跟踪环路

Binary offset carrier signal tracking loop

Abstract

本发明公开了一种二进制偏移载波信号跟踪环路,包括相关器模块、鉴相器单元和滤波器单元;相关器模块对输入的中频BOC信号进行解调和解扩处理,并且获得本地信号与中频BOC信号的多路相关值IIP、IIE、IIL、IQP、IQE、IQL和QIP;鉴相器单元检测载波相位的跟踪误差副载波相位的跟踪误差Δθ,并且测量扩频码的跟踪误差τ;滤波器单元对鉴相结果进行降噪和平滑处理,并将输出的跟踪误差转化成相应的频率控制字,对应反馈到相关器模块,跟踪输入的中频BOC信号,闭合跟踪环路。本发明实现副载波和扩频码的分离跟踪,消除BOC信号的跟踪模糊性;降低对捕获精度的要求,提高弱信号跟踪性能,增大了环路的动态范围;利用副载波的周期性,提高BOC信号的跟踪稳定性。

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