超大视场天顶仪旋转轴天文坐标解算OA

Aiming at the problems that approximate solution accuracy of the existing coordinate mean method is insufficient,and the conversion relationship between image coordinate system and tangent plane coordinate system of celestial sphere cannot be applied to large field of view,we develop an algo-rithm model for precise calculation of astronomical coordinates of rotation axis of zenith camera with ultra-large field of view.Based on the shafting deviation between the main optical axis and rotation ax-is,we construct a spherical triangle pointing to the north celestial pole and the two shafting systems,and construct a precise solution model of astronomical coordinates pointing to rotation axis based on spherical coordinates.The simulation results show that when the latitude coordinate pointed by the main optical axis is less than 80°,the calculation error of latitude coordinate is less than 1″,the calcu-lation error of azimuth angle is less than 5″ and the calculation error of height angle is less than 0.4″,the calculation error of astronomical coordinate pointed by rotation axis is less than 1″.