BOC及其衍生信号通用无模糊捕获分析

Analysis of general unambiguous acquisition for BOC and its derivative signals

针对BOC(binary offset carrier)及其衍生信号通用无模糊捕获方法匮乏的问题,提出了一种基于伪相关函数(pseudo correlation function,PCF)的无模糊捕获改进方法。首先,根据形状码向量的概念构建了BOC信号的互相关函数统一表达式,并提出了两组新的形状码向量;然后,通过接收信号与形状码向量对应的参考信号作互相关合成得到一个单峰;最后,通过单峰与自相关函数合成得到通用无模糊捕获方法。仿真实验表明,在同一条件下,新提出的捕获方法主峰能量相对于副载波相位消除法提高了23%,并且能够适用于所有类型和所有调制阶数的BOC信号,能够完全消除同步过程中自相关函数的模糊性。

For the problem of general unambiguous acquisition for BOC (binary offset carrier) and its derivative signals is still scarce of analysis, this paper proposed an improved unambiguous acquisition method based on PCF (pseudo correlation function). Firstly, this paper proposed the concept of step-shape bits vector to obtain a unified expression of cross-correlation function and designed two new step-shape vectors, then synthesized the received signal and referenced signal of corresponding to shape code vector to obtain a single peak. Finally, this paper obtained a generalized unambiguous acquisition method by combined the single peak and autocorrelation functions. The experimental results show that, under the same conditions, its peak energy of the main peak increases by 23% than sub carrier phase cancellation method, the new proposed method can deal with all kinds of BOC signals including complex ones with different types or orders and completely eliminate the ambiguity of the autocorrelation function in the synchronization process.