合成孔径声呐成像中，主要通过自聚焦校正剩余相位误差。
In synthetic aperture sonar imaging, the residual phase error is mainly corrected via autofocus.
该方法首先估计时延，然后再对剩余误差进行相位估计，从而扩大了算法适用的运动误差范围。
With this method, the time delay is estimated firstly, then the residual phase error. Through this way the movement error range that can be compensated by this algorithm is extended.
第三章介绍聚束sar去调频技术的原理及去除剩余视频相位误差的实现步骤。
Chapter 3 explains the theory of dechirp technic used in the Spotlight SAR at length and introduces the practical realization procedure of eliminating the residual video phase.
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