针对奇台110 m口径射电望远镜高指向精确度特点, 在现有天线指向模型的基础上, 推导了轨道误差源(轨道不平度)对指向精确度影响的关系模型。基于功率谱函数傅里叶级数系数归并法, 建立了天线轨道不平度数学模型。针对国外某完全焊接式50 m天线, 轨道水平度测量数据, 通过实验数值仿真, 采用查表法补偿轨道不平度造成的天线指向误差, 使俯仰角误差精确度提高了1.5″, 对高指向精确度天线实现的研究提供了有力支持。

For the characteristic of high pointing accuracy of QiTai 110 m diameter radio telescope, a pointing model is deduced on the relationship between the pointing error and track flatness. Based on the power spectrum function and Fourier series coefficients merging method, a mathematical model of antenna track roughness is established. Through the experiment on a foreign 50 m antenna with completely welded track, antenna elevation angle error is decreased by 1.5″, which provides strong support to achieve high pointing accuracy of antenna research.