中文摘要：

借助于数字摄影测量结果调整天线面板，使德令哈13．7m望远镜在仰角52°时获得最佳反射面面形，从而使天线效率在观测仰角范围内得到整体优化．与之前基于经纬仪测量的面板调整结果相比，天线口径效率提高约1倍。依据不同俯仰姿态下的测量结果，得到了天线的重力变形模型，包括副面偏移和倾斜、主面焦距和面形偏差随仰角变化的规律．根据不同仰角的面形偏差测量数据反演反射面重力变形模型时，采用了数据拟合方法，这样可以减小测量误差对模型精度的影响．

英文摘要：

A Profitting from photogramrnetric measurements, the main-reflector panels of Delingha 13.7 m telescope are adjusted such that the main dish closes most to a perfect paraboloid at 52° elevation other than at zenith as before, and thus the overall efficiency of the antenna is optimized at different observing elevations. Observations show that the aperture efficiency has been increased to around two times as compared with before when the panels were adjusted on the basis of theodolite measurements. From the measurements at several different elevations, a set of gravity deformation models for the antenna can be drawn to describe the displacement and tilt angle of the sub-reflector as well as the focal length and surface deviation of the main dish over the entire range of elevation angles. The face-up and face-side gravity deformations, which are necessary for the gravity deformation model of the main dish, are usually derived by direct calculation from surface measurements at only three elevation angles. In this paper, however, they are achieved by least square fitting of the surface measurements at more elevations because by this means less measurement errors can be introduced into the model.