提出一种自动检测时栅转台误差、辨识误差模型系数和误差补偿的方法。该系统利用自制的数控控制箱结合嵌入式技术，以高精度的圆光栅作为基准量仪，以双微控制器与上位机为基础，形成双闭环控制结构，实现系统的高精度定位。在对极点8个待定参数和对极内20个待定参数分别进行傅里叶变换的参数辨识，得到辨识误差模型的系数，实现了实时在线误差补偿。实验结果表明，时栅转台的精度达到2.4〞，提高了时栅转台标定精度与标定效率。%An automatic measurement method is proposed to measur error time grating turntable,identify parameters of model and compensating error. The system adopts home-made numerical control box combining with embedded technology. The high precision grating is used as reference meter,and the double closed-loop control structure is formed with double micro-controller and PC to achieve high-precision positioning system. The undetermined parameters,8 on poles and 20 within poles,are identified by the Fourier transform,to obtain coefficients of identifying error model and to realize the real-time online error compensation. Experimental results show that the double closed-loop control system and parameter identification of Fourier transform,can improve the accuracy and the efficiency of calibration,and the accuracy of the time grating turntable is up to 2. 4 〞.
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