Micro-Doppler effect of micromotion dynamics: a review

In this paper, we review the micro-Doppler effect induced by micro-motion dynamics and provide mathematics of the micro-Doppler effect by introducing micro motions to the conventional Doppler effect. Micro-Doppler effect was originally introduced in laser systems, but it can also be observed in microwave radar systems. We introduce some interesting results on observing micro-Doppler phenomenon using microwave radar systems and potential applications to target’s feature extraction.