当相位梯度算法挑选的散射点不是孤立散射点时，导致相位误差估计的准确性下降。
If the scatter selected in phase gradient algorithm(PGA) algorithm is not isolated, the accuracy of the phase error estimation will be degraded.
该算法采用了相位梯度算法(PGA)的处理结构，利用了多个距离单元上的散射点信号。
In the algorithm, the phase gradient algorithm (PGA) was performed, and the signals of multiple scatters on a few range bins were utilized.
在现有的相位补偿方法中，相位梯度自聚焦（PGA）算法是较好的一种。
Of the existing phase compensation methods, the phase gradient autofocus (PGA) algorithm is a better one.
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