Conventional studies on characteristics of micro-motion targets with precession in ballistic midcourse usually regard the scattering centers of targets as ideal scattering centers

while the motions of practical scattering centers are equivalent to the precession of targets

based on which the educed conclusions usually are of certain limitations.This paper reveals the differences between motions of the target and its equivalent scattering centers.By considering the non-ideal scattering phenomena of practical scattering centers as well as their shielding effects

a new radar echo model of midcourse targets with precession is established based on non-ideal scattering centers.The influence of precession parameuers upon the time-frequency characteristics is analyzed via a set of simulations

while the correctness of the results is validated by experiments in anechoic chamber.