An Effective Clutter Suppression Approach Based on Null-Space Technique for the Space-Borne Multichannel in Azimuth High-Resolution and Wide-Swath SAR System
An Effective Clutter Suppression Approach Based on Null-Space Technique for the Space-Borne Multichannel in Azimuth High-Resolution and Wide-Swath SAR System
复制标题
基于零空间技术的方位向高分辨率宽测绘带SAR系统天载多通道杂波有效抑制方法
DOI：
10.1109/tgrs.2021.3084696
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发表时间：
2022
影响因子：
8.2
通讯作者：
邢孟道
中科院分区：
文献类型：
--
作者：
张双喜;蒋哲艺;Junli Chen;李少杰;刘艳阳;郭睿;邢孟道
In this article, an effective clutter suppression algorithm is presented for the space-borne azimuth multiantenna high-resolution and wide-swath (HRWS) synthetic aperture radar (SAR) system, which is based on the null-space technique. First, the echo of bistatic geosynchronous-low earth orbit (GEO-LEO) azimuth multiantenna HRWS SAR-ground moving target indication (GMTI) system is utilized to deduce the coarse-focused image of moving targets and clutter, where the Chirp Fourier transform (CFT) in azimuth is involved. Then, the matrix form can be utilized to describe the coarse-focused image of the multiantenna SAR system and the corresponding covariance matrix can be estimated. After that, the null-space is constructed using the covariance matrix corresponding to clutter, where at least a redundant channel freedom is required. Since the null-space vector is orthogonal to signal-space vector, it can be used to suppress the clutter. As an equivalent phase is brought by the slant velocity, the moving targets’ echo can be preserved during clutter suppression. Then, the optimization and suboptimization vectors for clutter suppression are introduced. It is worth noting that the proposed clutter suppression algorithm is robust for the antenna mismatch, that is, the antenna mismatch in phase and the corresponding position error. Finally, the theoretical investigations are validated using some simulation experiments, where the experiments for bistatic GEO-LEO and single-platform azimuth multiantenna HRWS SAR-GMTI system are both included. In addition, the real measured single-platform azimuth multiantenna HRWS SAR data experiments are also performed.
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DOI：
--
发表时间：
2014-07
期刊：
--
影响因子：
--
作者：
S. Baumgartner;C. Schaefer;G. Krieger
通讯作者：
S. Baumgartner;C. Schaefer;G. Krieger
DOI：
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发表时间：
2012-04
期刊：
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影响因子：
--
作者：
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通讯作者：
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DOI：
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发表时间：
2009-09
期刊：
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影响因子：
--
作者：
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通讯作者：
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DOI：
10.1109/29.17564
发表时间：
1989-05-01
期刊：
IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING
影响因子：
--
作者：
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通讯作者：
NEHORAI, A
影响因子：
4.8
作者：
Lei Yang;Tong Wang;Z. Bao
通讯作者：
Lei Yang;Tong Wang;Z. Bao