群时延傅里叶分解模型及其估计方法  

Fourier decomposition model of group delay and its estimation method

作　　者：肖志斌[1] 黄仰博[1] 唐小妹[1] 刘增军[1] 倪少杰[1] XIAO Zhibin;HUANG Yangbo;TANG Xiaomei;LIU Zengjun;NI Shaojie(College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073

出　　处：《国防科技大学学报》2021年第5期72-79,共8页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(61601485)。

摘　　要：建立了基于三角函数级数的群时延模型,并理论证明了仅采用有限阶数的三角函数群时延即可表征任意群时延对信号相关峰的影响。在此基础上,通过测量信号相关峰,并与不同三角函数群时延组合下的相关峰进行匹配搜索即可估计群时延的三角函数分解级数,从而估计得到相关峰影响等效的群时延特性。仿真中,采用该方法估计得到的群时延特性对滤波器进行修正后,信号相关峰与经过滤波器之前的信号相关峰高度吻合,时延估计偏差在0.1 ns之内。A group delay model based on trigonometric function series was proposed.And it was theoretically proved that only a finite order of trigonometric function group delay can characterize the influence of arbitrary group delay on signal correlation peaks.On this basis,the trigonometric decomposition series of the group delay were obtained by measuring the correlation peaks and matching the correlation peaks under different combinations of trigonometric function group delays.As a result,the equivalent group delay with similar effects on the correlation peaks was obtained.Simulation results show that the correlation peak of the signal is approximately the same as that of the ideal correlation peak,and the delay estimation error is less than 0.1 ns at different delay time intervals after calibration of the channel by using the group delay estimated by this method.

关 键 词：群时延 卫星导航系统 傅里叶级数 相关峰 

分 类 号：TN914.42[电子电信—通信与信息系统]