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Micro-Doppler Signature Extraction and ISAR Imaging for Target With Micromotion Dynamics

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5 Author(s)
Kai-ming Li ; Inst. of Telecommun. Eng., Air Force Eng. Univ., Xi''an, China ; Xian-jiao Liang ; Qun Zhang ; Ying Luo
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The micromotion of a target will generate a micro-Doppler (m-D) effect in the frequency domain. The m-D effect is regarded as a unique property of the target, which has special significance in target detection, identification, and classification. The classical range-Doppler algorithm cannot obtain a clear inverse synthetic aperture radar (ISAR) image due to the m-D effect induced by micromotion dynamics. The m-D effect induced by periodical micromotion is represented as a sinusoidal modulation in a spectrogram, whereas the Doppler induced by a main body is depicted as the form of a straight line. Therefore, the extraction of an m-D signature is transformed into the separation of a sinusoid and a straight line. The cancellation technique is a classical method for removing ground clutter. Based on the same principle, the cancellation technique is applied to the spectrogram in this letter, which successfully achieves the separation of the m-D signature and gets the clearer ISAR image of the main body. The effectiveness and robustness of the algorithm are proved by simulation results.

Published in:

Geoscience and Remote Sensing Letters, IEEE  (Volume:8 ,  Issue: 3 )

Date of Publication:

May 2011

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