BOC调制导航信号的精确捕获方法研究

许　磊，何巍巍，赵　胜

(河北省卫星导航技术与装备工程技术研究中心，河北 石家庄 050081)



BOC调制导航信号的精确捕获方法研究

许磊，何巍巍，赵胜

(河北省卫星导航技术与装备工程技术研究中心，河北 石家庄 050081)

摘要二进制偏移载波(BOC)调制信号目前已经被广泛应用于全球卫星导航系统的信号体制设计中，与传统的BPSK信号相比能提供更好的码跟踪精度和抗多径能力。针对BOC信号的自相关函数多峰性导致伪码捕获模糊的问题，在介绍BOC信号特性的基础上，对4种BOC信号精确捕获算法进行了仿真验证，并对算法的捕获性能进行了对比评估，计算机仿真结果表明4种算法均能解决BOC信号捕获模糊的问题，这对充分发挥BOC信号的性能优势具有现实意义。

关键词BOC；精确捕获；自相关函数

Research on Unambiguous Acquisition Method of

Navigation Signal Based on BOC Modulation

XU Lei,HE Wei-wei,ZHAO Sheng

(HebeiSatelliteNavigationTechnologyandEquipmentEngineeringTechnologyResearchCentre，

ShijiazhuangHebei050081,China)

AbstractThe signal based on BOC Modulation has been widely used in signal architecture design of global navigation systems.Compared with traditional BPSK signal,it can provide better tracking accuracy and better resistance to multipath.For pseudocode ambiguous acquisition caused by multiple peaks of BOC signal,four unambiguous acquisition methods of BOC signal are simulated and verified based on the characteristics of BOC signal,and the comparative evaluation for their acquisition performances are performed.The computer simulation results show that these four methods can effectively solve the problem of ambiguous acquisition of BOC signal,which has operation significance for the development of BOC signal performance advantages.

Key wordsbinary offset carrier(BOC);unambiguous acquisition;autocorrelation function

0引言

二进制偏移载波(BOC)调制是一种随着导航技术的发展而逐步建立起来的新的调制技术，是一种能够很好地解决信号之间相互干扰、频谱混叠从而共享频带的调制体制，现代化的GPS，正在建设的GALILEO系统和北斗系统中已普遍采用BOC调制技术及其发展形式，因此BOC调制技术代表了GNSS信号体制设计的发展方向。

BOC信号的自相关函数具有多峰特性，并且副峰幅度与主峰幅度接近，接收机捕获的过程中存在捕获模糊问题，很容易误捕到副峰上。针对这一问题，本文对4种BOC信号精确捕获算法进行了仿真验证，并对算法的捕获性能进行了对比评估，计算机仿真结果表明4种算法均能解决BOC信号捕获模糊的问题，正确捕获到BOC信号自相关函数的主峰，可以避免BOC信号跟踪模糊的问题，充分发挥BOC信号高精度伪码跟踪的性能优势。……