中文说明：
雷达动目标回波仿真，进一步考虑LFM调频脉冲串，仿真一个运动目标的回波，以及通过脉冲压缩和FFT速度估计的过程。
English Description：
Radar moving target echo simulation, further consider LFM FM pulse train, simulate the echo of a moving target, as well as the process of pulse compression and FFT velocity estimation.