北斗QPSK调制信号多星联合捕获算法  

A simultaneous acquisition algorithm of multiple satellites for QPSK modulation signals of Beidou satellite navigation

作　　者：谢非[1] 刘建业[1] 李荣冰[1] 徐昭[1] 

机构地区：[1]南京航空航天大学自动化学院导航研究中心,江苏南京210016

出　　处：《系统工程与电子技术》2014年第8期1595-1601,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61273057;91016019);航空科学基金(20100852010);中航工业集团产学研项目;江苏高校优势学科建设工程资助项目;南航基本科研业务费专项科研项目资助课题

摘　　要：传统的接收机捕获方法仅针对单颗卫星码相位及载波频率进行搜索与捕获,为了提高接收机傅里叶变换及相关运算模块的使用效率,提出了一种面向北斗B1频点信号的多星联合捕获算法,并在此基础上建立了联合捕获相位参量与相应卫星编号间的映射关系。最后,利用采集的卫星中频信号对多种捕获算法进行了实验对比与性能分析,实验结果表明,多星联合捕获算法可成功对多颗卫星进行并行搜索及快速捕获,平均运行速度相对于传统捕获算法提高了约23%,改善了北斗接收机中信号捕获的处理效率。The traditional acquisition methods only search the code phase or Doppler shift of the single satel-lite.Firstly,in order to improve the efficiency of signal acquisition for the visible satellites in receivers,a simul-taneous acquisition algorithm of multiple satellites for BeiDou B1 signals is proposed.Secondly,the mapping re-lationship between the simultaneous searching satellite’s phase and the corresponding satellite number is built based on the proposed acquisition algorithm.Finally,the collected intermediate frequency signal is used to test the performance of various acquisition methods.The experiment results indicate that the proposed algorithm is capable of detecting multiple visible satellites and can improve the processing efficiency of signal acquisition in BeiDou receivers with an average operation speed improved by over 23%.

关 键 词：接收机 多星捕获 四相相移键控 北斗卫星导航系统 

分 类 号：P228.4[天文地球—大地测量学与测量工程]