强干扰下群时延失真对伪码测距性能的影响研究  

Effect of group delay on PN ranging performance in the existence of strong interference

作　　者：刘涛[1] 蒙艳松[1] 张立新[1] 

机构地区：[1]西安空间无线电技术研究所,陕西西安710071

出　　处：《电子设计工程》2015年第4期108-110,113,共4页Electronic Design Engineering

摘　　要：射频链路作为直扩导航系统的重要组成部分,会引入系统群时延,后者会一定程度的改变扩频信号的传输时延,进而恶化延迟锁定环(DLL)的伪距测量,在强干扰的影响下,系统群时延对伪码测距的恶化情况会更加复杂。基于此考虑,首先介绍了群时延的基本概念,给出了强干扰下群时延对伪码测距误差的理论推导,并在此基础上进行了仿真验证,仿真结果表明,宽带扫频式强干扰的存在使得线性群时延和抛物线群时延对伪码测距误差性能进一步的恶化。As an important part of the DSSS navigation system,RF link will bring the group delay to the system, which to some extent will change transmission delay, thereby worsening the pseudo-range measurements in delay locked loop（DLL）. And with the strong interference, the situation will be more complicated. Based on this consideration, this paper introduces the basic concepts of group delay, gives the theoretical derivation of the effect of group delay on ranging error in the existence of strong interference. Then on the foundation of derivation, this paper gives simulation results show that linear and parabolic group delay worsens the pseudo-code ranging performance in the presence of strong broadband sweep interference.

关 键 词：群时延 宽带扫频干扰 伪码测距 延迟锁定环 

分 类 号：TN967[电子电信—信号与信息处理]