关键词: 干涉合成孔径雷达(InSAR), 噪声子空间投影, 地面运动目标检测(GMTI)

Abstract:

For interferomatric synthetic aperture radar (InSAR) together with the ground moving target indication (GMTI) system, the problems of the terrain interferometric phase coupling and the non-stationary clutter induced by the long across-track baseline arise. To mitigate these problems, an alternative GMTI method is addressed. This method takes advantage of the coherence information to coregister two SAR images, and then removes the local flat-earth phase, compensates the terrain interferometric phase, and finally suppress the non-stationary clutter. Therefore, the GMTI function can be well performed in the existing InSAR system. Compared with conventional methods, the performance of target detection can be enhanced and the accuracy of velocity estimation can be greatly improved. Theoretical analysis and real measured data illustrate the effectiveness and practicability of the proposed GMTI method.

Key words: interferomatric synthetic aperture radar (InSAR), noise subspace projection, ground moving target indication (GMTI)