后方交会计算测站点坐标，由未知点设站，观测三个已知方向，计算测站坐标-Calculation of measured resection site coordinates, from an unknown point station, observing the direction of the three known to calculate station coordinates

空间后方交会简单编程程序，请大家相互学习相互指导-The space resection simple programming procedure, we learn from each other mutual guidance