TM65m射电望远镜副面随动模型及性能评估

Sub-reflector model depending on elevations and performance evaluation for TM65 m radio telescope

天马65 m射电望远镜副面系统的安装可以用来补偿副面支撑和主面的重力变形,在不同的俯仰角度上,副面位姿的调整可以提高天线的效率和指向性能,本文建立了副面位姿随俯仰角变化的模型,测试结果表明副面随动模型可以有效改善65 m望远镜在高低仰角上的效率,分别达到20%和15%,使得在整个俯仰角范围内,X波段的接收效率均到达60%以上;副面随动模型导致的指向偏差与grasp仿真结论符合良好.

A sub-reflector system of the TianMa 65 m radio telescopes has been installed in order to compensate for the gravitational deformation of the sub-reflector support and the main reflector. The position and attitude of the sub-reflector are variable in order to improve the pointing performance and the efficiency at different elevations. A model has been constructed to determine the position and attitude of the sub-reflector with elevation. Test results show that the sub-reflector model can effectively improve the efficiency of the 65 m radio telescope at both high and low elevations, where the efficiency can be improved by 20% and 15%, respectively. At X band, the aperture efficiency of the radio telescope reaches more than 60% over the entire elevation range. Pointing deviations caused by the sub-reflector model are consistent with the grasp simulation results.