Separation of Target Rigid Body and Micro-Doppler Effects in ISAR/SAR Imaging
DEFENCE RESEARCH AND DEVELOPMENT CANADA OTTAWA (ONTARIO)
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The micro-Doppler m-D effect is caused by moving parts of the radar target. This effect can degrade the quality of the ISARSAR image. However, at the same time, it carries information about the features of moving parts. The separation of the patterns caused by the stationary parts of the target from those caused by the moving rotating or vibrating parts is the topic of this report. Two techniques for the separation of the rigid part from the rotating parts have been proposed. The first technique is based on the time-frequency TF representation with sliding windows and order statistics techniques. The first step in this technique is the recognition of rigid parts in the rangecross-range plane. In the second step, the spectrogram and order statistics setup are employed to obtain the signals caused by the moving parts. The second technique based on the Radon transform can be applied in the case of very emphatic m-D effect. In the first step the rotating parts are recognized, based on the inverse Radon transform. After masking these patterns, a radar image with the rigid body reflection can be obtained. The proposed methods are illustrated by examples. The proposed methods not only focus the distorted SARISAR images, but also provide additional information about the rotatingvibrating features of the target.
- Active and Passive Radar Detection and Equipment