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.
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 velocity measurement of 2-dimensional motion is realized through target radial moving information measured by two times range finding to improve the shooting precision.
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。
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