水平式望远镜静态指向误差的建模与修正

Modeling and correction of static pointing error of level mounting telescope

对水平式望远镜静态指向误差进行建模与修正。根据水平式望远镜具体构架,设立地平坐标系和照准坐标系,推导出水平坐标系、地平坐标系和照准坐标系之间的转换公式,考虑望远镜的三轴误差和编码器误差等因素,建立水平式望远镜静态指向误差补偿模型(以下简称本文模型)。通过实测得到的恒星坐标数据对球谐函数模型、基本物理参数模型及本文模型行修正验证,实验结果表明,某型水平望远镜采用本文模型修正后,设备总指向精度由修正前的150.96″,提高到4.12″,满足系统总体提出的精度要求,能够广泛地应用于科研和工程领域。

A pointing error of level mounting optoelectronic telescope was modeled and corrected. According to the ar- chitecture of level mounting telescope, the horizontal coordinate system and the sighting coordinate system were built, then the conversion formulas of horizontal coordinates, horizon coordinate system and sighting coordinate system were derived. Considering triaxial error and encoder error of the telescope, etc. , the compensation model of static pointing error of level mounting telescope was established. Using the measured star coordinate data, spherical harmonies mod- el, basic physical parameter model and the proposed model were compared and verified. The experimental results show that total pointing error was reduced from 150. 96＂ to 4. 12＂ for a certain level mounting telescope after correcting with the proposed model, which meets the accuracy request, and it can widely use in the field of scientific research and en- gineering.