一种杂波分类辅助的近海岸模糊杂波抑制方法

doi:10.19665/j.issn1001-2400.2021.02.009

西安电子科技大学学报 ›› 2021, Vol. 48 ›› Issue (2): 64-71.doi: 10.19665/j.issn1001-2400.2021.02.009

一种杂波分类辅助的近海岸模糊杂波抑制方法

段崇棣^1,^2,³(),韩超垒⁴(),杨志伟⁴(),张庆君⁵()

1.北京理工大学信息与电子学院,北京 100081
2.西安空间无线电技术研究所,陕西西安 710100
3.空间微波技术重点实验室,陕西西安 710000
4.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
5.中国空间技术研究院,北京 100094

收稿日期:2020-07-08 修回日期:2020-12-23 出版日期:2021-04-20 发布日期:2021-04-28
通讯作者: 韩超垒
作者简介:段崇棣(1972—),男,高级工程师,E-mail: duanchongdi@hotmail.com|杨志伟(1980—),男,教授,E-mail: yangzw@xidian.edu.cn|张庆君(1969—),男,研究员,E-mail: ztzhangqj@163.com
基金资助:
国家自然科学基金(61671352);国家自然科学基金(61231017)

Inshore ambiguity clutter suppression method aided by clutter classification

DUAN Chongdi^1,^2,³(),HAN Chaolei⁴(),YANG Zhiwei⁴(),ZHANG Qingjun⁵()

1. School of Information and Electronics Beijing Institute of Technology,Beijing 100081,China
2. Xi’an Institute of Space Radio Technology,Xi’an 710100,China
3. National Key Laboratory of Science and Technology on Space Microwave,Xi’an 710000,China
4. National Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China
5. China Academy of Space Technology,Beijing 100094,China

Received:2020-07-08 Revised:2020-12-23 Online:2021-04-20 Published:2021-04-28
Contact: Chaolei HAN

摘要/Abstract

摘要：

针对近岸水面区域出现的强模糊地杂波造成多通道合成孔径雷达系统杂波抑制性能下降的问题,提出一种杂波分类辅助的近海岸模糊杂波抑制方法。首先,分别提取每一个距离-多普勒单元的多视干涉幅度/相位特征和多视干涉幅度梯度特征,构造多视干涉特征协方差矩阵;然后,通过多视干涉特征协方差矩阵间的仿射不变黎曼距离完成自动分类,准确地获取近海岸区域方位模糊位置;最后,在杂波分类结果的辅助下,选择独立同分布的杂波样本估计背景杂波协方差矩阵,进一步完成合成孔径雷达多通道图像域杂波抑制。仿真实验结果表明,这种方法能够对近海岸区域杂波进行准确分类,且可以有效地抑制方位模糊杂波。

关键词: 合成孔径雷达, 杂波抑制, 杂波分类, 黎曼距离, 近海岸区域, 方位模糊

Abstract:

To address the problem that the clutter suppression performance is reduced for the multichannel synthetic aperture radar(SAR) because of the ambiguous component of the land clutter in the inshore area,we propose an inshore ambiguity clutter suppression method aided by on clutter classification.First,a multi-look interference feature covariance matrix(MIFCM) for each range-Doppler unit is constructed,which includes multi-look interference magnitude/phase and multi-look interference magnitude gradient information.Next,with the affine invariant riemannian(AIR) distance measure of MIFCMs,the clutter classification result can be acquired.Finally,with the clutter classification result,we select independent and identically distributed(IID) training samples to estimate the clutter covariance matrix in the ambiguous clutter region,with clutter suppression performed in the multichannel SAR image domain.Simulation result shows that the proposed method can accurately classify and suppress the azimuth ambiguous clutter in the inshore area.

Key words: synthetic aperture radar, clutter suppression, clutter classification, affine invariant riemannian distance, inshore area, azimuth ambiguous

中图分类号:

TN958

段崇棣,韩超垒,杨志伟,张庆君. 一种杂波分类辅助的近海岸模糊杂波抑制方法[J]. 西安电子科技大学学报, 2021, 48(2): 64-71.

DUAN Chongdi,HAN Chaolei,YANG Zhiwei,ZHANG Qingjun. Inshore ambiguity clutter suppression method aided by clutter classification[J]. Journal of Xidian University, 2021, 48(2): 64-71.

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参考文献 14

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参数	值
雷达波长/m	0.031 1
通道数	2
基线长度/m	5.0
卫星平台速度/(km·s^-1)	7.500
脉冲重复频率/Hz	1 200

杂波类型	AM&SF方法	IMSR方法	文中方法
海杂波	40.2	99.9	100.0
模糊杂波	85.7	90.0	99.1
陆地杂波	81.5	98.5	99.0

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一种杂波分类辅助的近海岸模糊杂波抑制方法

Inshore ambiguity clutter suppression method aided by clutter classification

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