加权相位梯度自聚焦（PWE PGA）算法考虑了距离变化对相位误差的影响，扩展了PGA算法的应用范围。

Phase Weighted Estimation PGA(PWE PGA)is suggested which takes into consideration the range dependent phase error, so the PGA can be used in more fields.

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理论分析表明，按照抽样对象的不同，存在三种适用范围不同的算法：传递函数抽样法、点扩展函数抽样法和加权函数抽样法。

There exist three sampling methods according to the sampling objects: the transfer function sampling, the point-spread function sampling and the weighting function sampling.

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加权朴素贝叶斯是对它的一种扩展。

Weighted naive Bayes is it extension.

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