基于时延二维估计的BOC调制信号捕获方法  

An Acquisition Methods Based on Two-Dimensional Time Delay Evaluation for Binary Offset Carrier Modulated Signals

作　　者：李琳 谭述森 陈向东 

机构地区：[1]北京卫星导航中心,北京100094

出　　处：《电子学报》2017年第7期1792-1800,共9页Acta Electronica Sinica

摘　　要：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.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 newacquisition method based on tow-dimensional time delay evaluation. Compared with existing mainstream acquisition methods,the newacquisition 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.

关 键 词：BOC调制 子载波调制 捕获模糊 时延估计 

分 类 号：P228[天文地球—大地测量学与测量工程]