介绍一种新的差分gps方法，既位置差分法。

A new DGPS method position DGPS is introduced in the paper.

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似然变量的一阶差分，可以用于检测来自其它概率分布的数据点的位置，改善反褶积的效果。

The first order difference of likelihood variable may be used to locate data points in other probability distributions and to improve deconvolution result then.

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该方法从恒星之间的相对位置入手，避开通过灰度差分消减恒星的过程。

This method starts from relative position of stars and avoids from removing stars by gray difference.

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