由两次测距的目标径向运动信息，实现目标二维运动速度测量，改善射击精度。
The velocity measurement of 2-dimensional motion is realized through target radial moving information measured by two times range finding to improve the shooting precision.
自聚焦的目的是从雷达回波中消除目标径向运动的影响，只保留步进频率的影响，而后者是合成hrr能力的基础。
The purpose of autofocusing is to remove the radial motion effect of the target from radar echoes, and only reserve the stepped frequency effect which is the basis of synthetic HRR capability.
频率步进合成高分辨雷达体制受目标径向运动速度的影响极大，为了获取目标准确的高分辨距离像，需要做运动补偿。
Target velocity has a big negative effect on synthetic high resolution range profiles of step frequency radar. In order to obtain precise profiles, velocity compensation is indispensable.
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