解算后方交会的简捷公式及其证明

Derivation of the Simple Formula of Resection

本文根据后方交会已知点和未知点的两个辅助圆的共用弦线，建立新的参考坐标系，求得未知点的参考坐标，然后通过坐标转换，求得解算未知点的坐标公式。

In this paper, based upon public chord of two auxiliary circles of known points and unknown point of resection, a reference coordinate system is constructed with the chord. And then the referance coordinates of unknown point are solved. Through coordinate transformation, the formula of coordinate of unknown point is derived at last.