Time-frequency signatures of micro-Doppler phenomenon for feature extraction

In this paper, we introduce the concept of micro-Doppler phenomenon. Micro-Doppler induced by mechanical vibrating or rotating of structures in a target is potentially useful for detection, classification and recognition of targets, While the Doppler frequency due to target body is constant, the micro-Doppler due to vibrating or rotating structures of a target is a function of the dwell time. This time-varying Doppler signature in the time-frequency domain may provide further information for target detection, classification and recognition.