GSSMP转动精度的测量与标定

为了更好地实现巨型可控科学反射镜原理演示验证平台（Giant Steerable Science Mirror Prototype，GSSMP）的指向功能，需要对GSSMP的转动精度进行测量与标定，利用激光跟踪仪对转台编码器进行标校，并通过激光跟踪仪完成角度测量。首先，基于角度测量原理进行了接触式测量和非接触式测量方式的单点精度标校，得到测量误差分别为23.7与0.71。通过公式推导验证，四个角反射器的使用能够消除6以及6的倍数谐波之外所有阶数的谐波，从而提高测量精度。最后，比较四个角反射器两种不同的排布方式的角度测量误差，得出均匀分布的误差为11.5，非均匀分布误差为9.04，而单个角反射器测量误差为23.7。通过激光跟踪仪对望远镜方位轴转动精度的测量，验证了所述理论的正确性与方法的可行性。研究结果对于30 m望远镜的工作进一步完成有着重要的意义，同时对于类似的转台精度的检测也有一定的指导意义。

Metrology and calibration of GSSMP rotation accuracy

In order to better realize the pointing function of GSSMP, the rotation accuracy of GSSMP needs to be measured and calibrated, the rotation encoder was calibrated with the laser tracker, and the angle measurement was completed with the laser tracker. First of all, based on the principle of angle measurement, the contact measurement and non-contact measurement methods of single point calibration precision and error of measurement were 23.7 and 0.71. It was proved by formula derivation that four Sphere Mounted retro-Reflectors (SMRs) can eliminate the harmonics of all orders other than the multiple harmonics of 6 improving the measurement accuracy. Finally, the angular measurement error of two different arrangement methods of four SMRs was compared, and the uniform distribution error was 11.5, the non-uniform distribution error was 9.04, and the measurement error of a single angular reflector was 23.7. By measuring the rotation precision of the telescope's azimuth axis with laser tracker, the correctness of the theory and the feasibility of the method were verified. The research were of great significance to the further completion of the work of the 30 m telescope.