A Clutter Suppression Approach for SAR-GMTI Based on Dual-channel DPCA
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摘要: 偏置相位中心天线技术(DPCA)作为空时自适应信号处理(STAP)技术的特殊形式,在合成孔径雷达地面动目标指示(SAR-GMTI)领域得到了广泛的应用。杂波抑制的能力直接决定了GMTI 的性能,传统的复图像域DPCA 技术对于地杂波抑制能力有限,特别是广泛分布着强散射静止地物的城市区域。该文利用干涉相位对DPCA幅度进行非线性加权,提出了一种加权DPCA 杂波抑制方法,该方法降低了通道间残差相位对DPCA 杂波抑制的影响。实验结果表明:该文方法在杂波抑制能力上优于传统DPCA 方法。
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关键词:
- 空时自适应信号处理(STAP) /
- 偏置相位中心天线(DPCA) /
- 合成孔径雷达(SAR) /
- 地面动目标检测(GMTI) /
- 杂波抑制
Abstract: The Displaced Phase Center Antenna (DPCA) technology, a particular form of Space Time Adaptive Processing (STAP), has been widely used in Synthetic Aperture Radar Ground Moving Target Indication (SAR-GMTI). The GMTI performance depends on the capability of clutter rejection but the traditional DPCA technology operated in the complex image domain does not have the appropriate clutter rejection capability for urban areas with strong scattering stationary objects. Hence, interferometry phase is used to weight the DPCA magnitude nonlinearly, and a weighted DPCA clutter rejection approach is proposed, which reduces the interference from residual phase difference. The experimental results suggest that the new approach can improve the clutter rejection compared with the conventional DPCA.
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