基于形状码向量设计的卫星导航BOC调制信号无模糊捕获方法  

Unambiguous Acquisition Method for Satellite Navigation BOC Modulated Signals Based on the Design of Shape Code Vector

作　　者：孟振 刘昌迪 沈锋 MENG Zhen;LIU Changdi;SHEN Feng(School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116;College of Electrical and Information Engineering,Hunan University,Changsha 410082;School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin 150001)

机构地区：[1]中国矿业大学信息与控制工程学院,徐州221116 [2]湖南大学电气与信息工程学院,长沙410082 [3]哈尔滨工业大学仪器科学与工程学院,哈尔滨150001

出　　处：《系统科学与数学》2025年第1期41-55,共15页Journal of Systems Science and Mathematical Sciences

基　　金：国家自然科学基金(62203447,61673128)资助课题。

摘　　要：二进制偏移载波(BOC)调制方式有效缓解了频谱资源紧缺的问题,成功应用于现代卫星导航系统中.然而, BOC调制信号的自相关函数呈现多峰特性,造成信号捕获过程中出现模糊问题.为此,文章提出一种适用于BOC调制信号的无模糊捕获方法.通过设计两组具有特定形状码向量的扩谱辅助信号,将这些辅助信号分别与输入信号进行相关运算得到相关函数,组合这些相关函数得到重构的最终相关函数.仿真实验结果表明:最终的相关函数结果中不包含任何的边峰,文章所提方法能够完全消除捕获模糊问题,而且对偶数阶的BOC调制信号有效.虽然文章方法有一定的捕获灵敏度损失,但是所需要的捕获电路相关器个数较少.目前,大多数的卫星导航系统都采用偶数阶的BOC调制信号,因此,文章所提出方法比传统的方法具有更广阔的应用前景.The binary offset carrier(BOC)modulation effectively alleviates the problem of scarce spectrum resources,which is successfully applied to modern satel-lite navigation systems.However,the autocorrelation of BOC modulated signals has inherent multi-peak feature,which causes the ambiguity problems during the signal acquisition.To this end,this paper proposes an unambiguous acquisition method suitable for BOC modulated signals.By designing two sets of spread-spectrum aux-iliary signals with specific shape code vectors,these auxiliary signals are respectively related to the input signal to obtain the correlation functions.The obtained corre-lation functions are combined to acquire the final reconstructed correlation function.Simulation results show that the curves of the final correlation function do not con-tain any subpeaks.The proposed method can completely eliminate the acquisition problem,and it is effective for the even-order BOC modulated signals.Although the proposed method has a certain loss of capture sensitivity,but the number of cor-relators required by the capture circuit is small.Because most of existing satellite systems use BOC modulated signals of even order,the proposed method has wider applications than traditional methods.

关 键 词：卫星导航系统 BOC调制 组合相关函数 形状码向量 无模糊捕获 

分 类 号：TN967.1[电子电信—信号与信息处理]