基于自适应迭代的强弱信号波达方向估计

doi:10.3969/j.issn.0372-2112.2015.07.027

电子学报 ›› 2015, Vol. 43 ›› Issue (7): 1425-1431.DOI: 10.3969/j.issn.0372-2112.2015.07.027

基于自适应迭代的强弱信号波达方向估计

刘永军, 廖桂生, 杨东

西安电子科技大学雷达信号处理国家重点实验室, 陕西西安 710071

收稿日期:2013-11-21 修回日期:2014-11-20 出版日期:2015-07-25
- 作者简介:
- 刘永军 男,1990年12月生于陕西西安.现为西安电子科技大学信号与信息处理专业在读博士研究生,主要研究方向为阵列信号处理和雷达通信一体化波形设计. E-mail:yjliuinsist@163.com;廖桂生 男,1963年6月生于广西桂林.现为西安电子科技大学雷达信号处理国家重点实验室教授,博士生导师,国家杰出青年基金获得者,长江学者特聘教授.先后主持和承担国防973项目课题、国家"863"高新技术项目、国防科技预研、国家自然科学基金重点基金等十余项科研任务.现主要从事雷达探测系统信号处理,包括空时自适应处理、天基预警和阵列信号处理等领域的研究.E-mail:liaogs@xidian.edu.cn;杨东 男,1988年出生于陕西西安.现为西安电子科技大学信号与信息处理专业在读博士研究生,研究方向为阵列信号处理、高分辨雷达成像及动目标检测、稀疏雷达信号处理等. E-mail:yangdongxd@gmail.com
- 基金资助:
- 国家自然科学基金 (No.61231017)

DOA Estimation for Strong and Weak Signals Based on Adaptive Iteration

LIU Yong-jun, LIAO Gui-sheng, YANG Dong

National Key Laboratory of Radar Signal Processing, Xidian University, Xi'an, Shaanxi 710071, China

Received:2013-11-21 Revised:2014-11-20 Online:2015-07-25 Published:2015-07-25
- Supported by:
- National Natural Science Foundation of China (No.61231017)

摘要/Abstract

摘要：

针对强弱信号难以同时检测与估计的问题,本文提出一种基于自适应迭代的强弱信号波达方向估计方法.首先将空间角度离散化,根据信号相消的性质构造空间谱函数,然后通过自适应迭代抑制强信号的能量,最后计算不同角度对应的空间谱函数,利用其谱峰估计信号的波达方向.理论分析和仿真实验表明,本文方法无需信号源的先验信息,在低信噪比和少量快拍数的条件下,可以实现强弱信号DOA的高分辨估计,有效提高弱信号的检测概率和估计精度.

关键词: 自适应迭代, DOA估计, 强弱信号, 低信噪比

Abstract:

To detect and estimate weak targets from the strong ones,a new method based on adaptive iteration is proposed to estimate the DOA.Firstly,the space angle is dispersed and the spatial spectrum function is constructed based on the property of signal subtraction.Secondly,the energy of strong signal is suppressed through adaptive iteration.Finally,the value of spatial spectrum is calculated,and the DOAs of the signals are estimated through the peaks.Theoretical analysis and simulation results show that the method can achieve high-resolution DOA estimation without the prior knowledge of angles,even with the low signal-to-noise-ratio (SNR) and small snapshots.In addition,the proposed method can improve the detection probability and estimation accuracy of weak signal.

Key words: adaptive iteration, direction of arrival estimation, strong/weak signals, low signal-to-noise ratio

中图分类号:

TN957.52

刘永军, 廖桂生, 杨东. 基于自适应迭代的强弱信号波达方向估计[J]. 电子学报, 2015, 43(7): 1425-1431.

LIU Yong-jun, LIAO Gui-sheng, YANG Dong . DOA Estimation for Strong and Weak Signals Based on Adaptive Iteration[J]. Acta Electronica Sinica, 2015, 43(7): 1425-1431.

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基于自适应迭代的强弱信号波达方向估计

DOA Estimation for Strong and Weak Signals Based on Adaptive Iteration

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