高精度宽带欠定信号快速DOA估计方法

doi:10.19665/j.issn1001-2400.2020.02.013

西安电子科技大学学报 ›› 2020, Vol. 47 ›› Issue (2): 91-97.doi: 10.19665/j.issn1001-2400.2020.02.013

高精度宽带欠定信号快速DOA估计方法

蒋莹¹,冯明月¹,徐起²,何翼³()

1.空军预警学院信息对抗系,湖北武汉 430019
2.中国人民解放军第94654部队,江苏南京 210000
3.海军研究院, 北京 100161

收稿日期:2019-10-31 出版日期:2020-04-20 发布日期:2020-04-26
通讯作者: 何翼
作者简介:蒋莹(1991—),女,空军预警学院博士研究生,E-mail:jty614@163.com
基金资助:
湖北省自然科学基金(2019CFB383)

Fast DOA estimation methods for underdetermined wideband signals with a high accuracy

JIANG Ying¹,FENG Mingyue¹,XU Qi²,HE Yi³()

1.Air Force Early Warning Academy, Wuhan 430019, China
2.Unit 94654 of the PLA, Nanjing 211800, China
3.Naval Research Academy, Beijing 100161, China

Received:2019-10-31 Online:2020-04-20 Published:2020-04-26
Contact: Yi HE

摘要/Abstract

摘要：

针对分布式同步正交匹配跟踪算法精度不高的问题,基于多次迭代搜索的思想,提出两种高精度宽带欠定信号到达角估计方法。首先,构建稀疏阵列宽带信号处理模型,并通过稀疏表示将到达角估计转化为分布式压缩感知问题;其次,利用矩阵变换去除噪声污染项,以消除噪声功率的影响;然后,分别利用邻近网格搜索和网格精细化搜索两种方式进行改进,以提高无网格失配和有网格失配条件下的到达角估计精度。仿真结果表明,所提算法是有效的,在保持运算速度优势的前提下,较分布式同步正交匹配跟踪算法显著提升了估计精度。

关键词: 到达角估计, 测向自由度, 高精度, 稀疏阵列, 宽带信号

Abstract:

In order to handle the low accuracy of the algorithm DCS-SOMP, two underdetermined wideband direction of arrival estimation methods with a high accuracy are proposed from the perspective of multiple iteration. First, the wideband signal processing model using the sparse array is established and transformed into a distributed compressive sensing problem through sparse representation. Then, the noises are eliminated through matrix transformation. After that, an algorithm utilizing proximity searching is proposed to improve the estimation accuracy and an algorithm based on the refined grid is proposed to compensate grid mismatch. Simulation results show that the proposed algorithms outperform the DCS-SOMP with a higher estimation accuracy and possess the advantage in computational speed.

Key words: direction of arrival, degrees of freedom, high accuracy, sparse array, wideband signal

中图分类号:

TN971

蒋莹,冯明月,徐起,何翼. 高精度宽带欠定信号快速DOA估计方法[J]. 西安电子科技大学学报, 2020, 47(2): 91-97.

JIANG Ying,FENG Mingyue,XU Qi,HE Yi. Fast DOA estimation methods for underdetermined wideband signals with a high accuracy[J]. Journal of Xidian University, 2020, 47(2): 91-97.

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参考文献 14

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算法	信噪比变化	频域快拍次数变化
DCS-SOMP	0.0525	0.0529
DCS-PSOMP	0.1289	0.1286
WNNSBL	8.9965	6.6670
WLASSO	24.1640	21.2473
WSSMUSIC	0.4481	0.4395
DCS-RSOMP	0.6335	0.6297
TS-OG	43.7327	41.3953

高精度宽带欠定信号快速DOA估计方法

Fast DOA estimation methods for underdetermined wideband signals with a high accuracy

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