Abstract: Motion compensation is necessary in stepped-frequency radar system.A new Doppler matched filter has been developed for estimating the target’s radial velocity，which avoids the multiple bursts required by other methods.The high Signal-
to-Noise Ratio（SNR） resulting from the application of Chirp sub-pulse compression improves the accuracy of estimation.The Cramer-Rao bound for the lower limit on the velocity estimation is derived to demonstrate the performance of the proposed method.

Key words: stepped-frequency Chirp pulse train, motion compensation, Doppler matched filter, one-dimensional range profile, Cramer-Rao bound

摘要： 频率步进信号是一种重要的距离高分辨信号，但对目标运动比较敏感。对于运动目标成像，必须进行运动补偿。根据频率步进信号的多普勒特征构造一种多普勒匹配滤波器对目标径向速度进行估计。该方法能在一帧信号内估计出目标径向速度。Chirp子脉冲经过脉冲压缩提高了信噪比，保证了估计的精度。同时给出频率步进信号径向速度估计的Cramer-Rao限，并与多普勒匹配滤波仿真数据进行了比较。

关键词: Chirp子脉冲频率步进信号, 运动补偿, 多普勒匹配滤波器, 一维距离像, Cramer-Rao限