Abstract:

Based on single pass InSAR system, the inteferometric phase and InSAR 3D imaging characteristics of target with rotational micro motion are studied, and the “barrier” effect of target with rotational micro\|motion in the InSAR image is revealed for the first time. Firstly, both 3D geometric model and signal model of the rotational target with arbitrary attitude are built in this paper, and the imaging results are derived. Then, by comparing the imaging results of InSAR’s two channels, the interferometry phases of the rotational target are proved to be approximate equal to the inteferometry phase of the location where the rotational center lies in, and the effect of the rotational parameters and the attitude of the rotational target can be neglected. On the basis, it is pointed out that the InSAR image result of the rotational target shows the “barrier” effect which spreads along the cross range direction. The height and the length of the “barrier” depend on the vertical direction coordinate of the rotation center and the rotational parameters respectively. The analyses are verified by simulation experiments.

Key words: Target with rotational micro motion； SAR (Synthetic Aperture Radar)； InSAR (Interferometric Synthetic Aperture Radar)； Inteferometric phase； “Barrier&rdquo, effect