脉冲多普勒雷达是利用运动的物体对发射信号的产生的多普勒效应来测速和测距的，利用回波的延时可以测距，求出多普勒频率可以求出物体的速度-Pulse Doppler radar is to use the Doppler effect on the motion of an object generated by the transmission signal to the speed and distance, the distance can use the echo delay, the Dop