一种弱信号下的组合导航跟踪环路设计  

A design on tracking loop for integrated navigation in weak signal

作　　者：赵亮[1] 杨志坤 Zhao Liang;Yang Zhikun(School of Information Engineering,Southwest University of Science and Technology;Sichuan Jiuzhou Beidou Navigation and Location Service Co.,Ltd,Mianyang 621000,China)

机构地区：[1]西南科技大学信息工程学院 [2]四川九州北斗导航与位置服务有限公司,四川绵阳621000

出　　处：《信息通信》2020年第12期77-81,共5页Information & Communications

基　　金：绵阳市科技项目(2019YFZJ008)。

摘　　要：针对全球定位系统/惯性导航系统(GPS/INS)组合导航在弱信号环境下载波跟踪性能下降的问题,从跟踪环路的结构及影响因素方面论述了接收机对于导航信号的跟踪过程,提出了双通道合作跟踪环路的设计以实现对载波的持续锁定。仿真显示,所提出的方法在信号强度低于25 dB/Hz时,仍能保持较低的速度误差,且没有出现失锁的情况。这为改善弱信号环境下组合导航系统的性能提供了参考途径,可以为实际组合导航系统的跟踪环路设计提供借鉴。According to the fact that the performances of GPS/INS integrated navigation degrade in weak signal environment,this paper described the receiver architecture and influence factors in navigation signal tracking process, and presented a tracking loop with dual channel cooperation in order to lock the carrier wave. The results of simulation experiment indicated that the velocity error from the method was small even the signal strength was less than 25 dB/Hz, and there were not loss of lock. The study provided a way to improve the performance of integrated navigation in weak signal environment, it can be a reference for tracking loop design in real integrated navigation.

关 键 词：组合导航 弱信号 接收机 双通道 跟踪环路 

分 类 号：P228[天文地球—大地测量学与测量工程]