Ground Moving Target Indication Using an InSAR System With a Hybrid Baseline
Ground Moving Target Indication Using an InSAR System With a Hybrid Baseline
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DOI：
10.1109/lgrs.2008.916067
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发表时间：
2008-04
影响因子：
4.8
通讯作者：
Lei Yang;Tong Wang;Z. Bao
中科院分区：
文献类型：
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作者：
Lei Yang;Tong Wang;Z. Bao
本文利用一台用于地形高度估计的双通道机载实验性干涉合成孔径雷达（干涉合成孔径雷达）来获得地面动目标检测（GMTI）能力。由于该系统采用混合基线，干涉相位随目标运动和地形高度变化而变化。干涉相位的起伏影响了杂波抑制和径向速度估计的性能。为了解决这一问题，提出了一种三步GMTI方法。在分别采用两步消除场景的局部平地相位和跨航迹干涉相位后，采用自适应滤波方法抑制平稳杂波，并对传感器响应进行校准。然后使用常规的恒定虚警率检测器来指示运动目标。利用机载干涉合成孔径雷达实验系统采集的真实的数据验证了该方法的有效性。
In this letter, a two-channel airborne experimental interferometric synthetic aperture radar (InSAR) designed for terrain height estimation is exploited to acquire the ability of ground moving target indication (GMTI). Due to the hybrid baseline of this system, the interferometric phase changes with the target motion as well as the terrain height. The fluctuation of the interferometric phase worsens the performance of the clutter suppression and the radial velocity estimation. In order to resolve this problem, a GMTI method with three steps is proposed. After two steps are used to eliminate the local flat-Earth phase and the cross-track interferometric phase of the scene, respectively, an adaptive filtering method is used to suppress the stationary clutter with the benefit of calibrating the sensor responses. A conventional constant false alarm rate detector is then used to indicate the moving targets. The validity of the proposed method is demonstrated with real data collected using an experimental airborne InSAR system.