The third chapter discusses the Ground Moving Target Indicator(GMTI) technique. First, founds the model of moving point target and discusses the effect of the movement to the echo Doppler center frequency and Doppler rate. 第二,建立了运动目标回波模型,并分析了目标运动对回波多普勒中心频率和调频率的影响,进而分析了目标运动特性对成像造成的影响。