GPS坐标转换程序。由笛卡尔坐标和大地坐标的相互转换，由笛卡尔坐标转换为站心地平坐标，由站心地平直角坐标转换为站心地平极坐标-GPS coordinates of the conversion process. By the Cartesian coordinates and geodetic coordinates of each conversion, the conversion from Cartesian coordinates for the station carefully pi