›› 2014, Vol. 27 ›› Issue (7): 43-.

• 论文 • 上一篇    下一篇

基于子空间匹配追踪的LFM信号的DOA估计

刘璐,聂敏   

  1. (西安邮电大学 通信与信息工程学院,陕西 西安 710121)
  • 出版日期:2014-07-15 发布日期:2014-07-19
  • 作者简介:刘璐(1988—),女,博士研究生,助教。研究方向:信号与信息处理。E-mail:liulu88131@163.com
  • 基金资助:

    国家自然科学基金资助项目(61172071)

DOA Estimation of LFM Signal Based on Subspace Matching Pursuit

LIU Lu,NIE Min   

  1. (School of Communication and Information Engineering,Xi'an University of Posts and Telecommunication,Xi'an 710121,China)
  • Online:2014-07-15 Published:2014-07-19

摘要:

DOA估计是阵列信号处理中的热点。文中针对LFM信号的DOA估计算法采样数据量大,在低信噪比情况下估计效果不理想的问题,提出了基于子空间匹配追踪的LFM信号的DOA估计。该方法通过子空间匹配追踪算法将信号投影在子空间上,求出最大投影,最终估计出LFM信号的DOA。此外,改进后的空间匹配追踪算法,还解决了原算法收敛速度慢、会出现过匹配现象的问题。经仿真验证对比,该算法估计DOA的过程中匹配次数远小于匹配追踪的过程中,且在较低的信噪比下能估计出DOA。

关键词: 线性调频信号, DOA估计, 压缩感知, 匹配追踪算法

Abstract:

A DOA estimation of LFM signal based on subspace matching pursuit is purposed to deal with the large sampled data in the estimation of LFM signal and unsatisfactory estimation under low signal noise ratio.The subspace matching pursuit arithmetic projects the signal on the subspace,calculates the maximum projection,and finally estimates the DOA of the LFM signal.This arithmetic also improves matching pursuit arithmetic and decreases the over matching phenomenon.Simulations show that the number of over matching by the subspace matching pursuit arithmetic is much less than that by the matching pursuit arithmetic,and the DOA are estimated under low signal noise ratio.

Key words: liner frequency modulated signal;estimation of DOA;compressed sensing;matching pursuit arithmetic

中图分类号: 

  • TN957.51