Targets with micro-motions have modulation effects on radar echoes

which vary for different radar waveforms.With high range resolution and Doppler resolution simultaneity

Orthogonal Frequency-Division Multiplexing (OFDM) radar signals can reveal the modulation effects more completely and more profoundly.At the beginning

based on the model of OFDM radar echoes of point-scattering targets with micro-motions

the modulation mechanism is derived

at two aspects of High Resolution Range Profile (HRRP) and micro-Doppler.And then

the relationship between the modulation effects

the parameters of radar and micro-motions is analyzed.It comes to a conclusion that the OFDM radar signals combine the advantage of Linear Frequency Modulated (LFM) signals and Pulse Doppler (PD) radar signals on micro-motion analysis

and they are more favorable for micro-motion feature extraction and target recognition.Finally

the results from simulations and anechoic chamber data prove the validity of the conclusion.