基于时延二维估计的BOC调制信号捕获方法

摘要

The acquisition ambiguity problem of binary offset carrier (BOC) modulated signals resulted from the multiple correlation peaks of BOC modulated signals when employing correlation techniques used for conventional binary phase shift keying (BPSK) receivers.This paper systematically analyses circumvention mentality of acquisition ambiguity as well as the derivative acquisition method,and then put forward a new acquisition method based on tow-dimensional time delay evaluation.Compared with existing mainstream acquisition methods,the new acquisition method is comprehensive optimum in many aspects,including modulation parameter susceptibility,signal-to-noise ratio (SNR) loss,search step,estimated accuracy,hardware resource requirement and realization architecture.%采用常规的BPSK调制信号捕获方法处理BOC调制信号时,会因BOC调制信号相关函数的副相关峰具有数目较多、幅度较大、峰间时延较小等特点而引发捕获模糊问题.本文系统解析主流捕获方法的捕获模糊规避思路,提出一种基于时延二维估计的BOC调制信号新型捕获方法.与主流捕获方法相比,时延二维估计法在调制参数敏感性、信噪比损失、搜索步长、时延估计精度、硬件资源需求、实现架构等方面综合最优.