摘要
GPS和Galileo卫星组合导航定位能够有效的提高定位精度和可靠性,兼容多星座的信号捕获是优化组合导航定位的关键技术。但两个系统的信号格式存在着一定的差异性,特别是在调制方式上Galileo采用了一种具有多峰特性的BOC调制。若将适用于GPS的传统算法用于Galileo信号的捕获将出现误捕等问题,由此带来了兼容捕获技术实现的难点。因此,以优化组合导航系统性能为出发点,选取具有代表性的GPS L1和Galileo E1B频点信号展开研究,首先提出了一种基于合成相关函数的BOC信号无模糊度捕获新算法,能够有效的消除副峰,实现过程简单,且与捕获GPS信号经典的并行码相位算法的流程高度契合,进而提出了充分兼顾了GPS和Galileo系统信号特点的双模捕获策略。仿真结果表明:新算法具有良好的捕获性能,新策略具有可行性。
The GPS and Galileo satellite integrated navigation system can effectively improve the positioning accuracy and reliability.The multi-constellation signal acquisition was the key technology to optimize the positioning of integrated navigation.However,there was difference between signal formats of the two systems,especially in the modulation mode.Galileo adopted a BOC modulation with multimodal characteristic.If the traditional algorithm was applied to the capture of Galileo signal,the problems of false capture might be brought,and the difficulties of compatible capture were also brought.In order to optimize the performance of integrated navigation system,this research selected the typical frequency signal GPS L1 and Galileo E1 B.Firstly,a new capture algorithm of BOC signal without fuzzy degree was proposed based on composite correlation function,which can effectively eliminate the secondary peak.The realization process is simple,which is highly consistent with the process of classic parallel code phase algorithm of capturing GPS signals.And then a dual-mode acquisition strategy compatible acquisition strategy was proposed,which fully considered the features of GPS and Galileo system signals.Simulation results show that the new algorithm has good capture performance and the new strategy is feasible.
作者
徐冰艳
郭承军
XU Bing-yan;GU0 Cheng-jun(Research Institute of Electronic Science and Technology,University of Electronic of Science and Technology of China,Chengdu Sichuan 611731,China)
出处
《计算机仿真》
北大核心
2019年第3期110-114,共5页
Computer Simulation
