TM65 m射电望远镜副面位姿建模

发布时间：2018-05-18 07:22

  本文选题：望远镜 + 方法　； 参考：《天文学报》2016年01期

【摘要】：大型射电望远镜在观测过程中,随着俯仰角度的变化,副面支撑、背架、主反射面等都有不同程度的变形,这将导致天线效率在高低俯仰角上明显下降,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.通过在X波段和Ku波段研究副面位姿变化对天线效率的影响,用射电法建立了随俯仰角度变化的副面位姿随动调整模型和指向补偿模型.此外还测试了副面随动与固定对天线效率的影响,结果表明副面随动模型可以有效改善65 m望远镜在高低俯仰角上的效率,使得在整个俯仰角范围内,X波段的接受效率均达到60%以上.
[Abstract]:In the observation process of large radio telescope, with the change of pitch angle, the auxiliary surface support, back frame, main reflector and so on have different degrees of deformation, which will cause the antenna efficiency to decrease obviously in high and low pitch angle. The installation of the auxiliary plane system of the Tianma 65m radio telescope can be used to compensate the auxiliary surface support and the gravity deformation of the main plane. In different pitch angles, the adjustment of the position and orientation of the auxiliary plane can improve the efficiency and the pointing performance of the antenna. By studying the effect of the variation of the position and attitude of the secondary plane on the antenna efficiency in X-band and Ku-band, the following adjustment model and direction-compensation model of the sub-plane position and attitude with the change of pitch angle are established by radio method. In addition, the effect of auxiliary surface tracking and fixing on antenna efficiency is also tested. The results show that the auxiliary surface tracking model can effectively improve the efficiency of the 65m telescope at high and low pitch angles. The acceptance efficiency of X band is over 60% in the range of pitch angle.
【作者单位】： 上海应用技术学院电气与电子工程学院;中国科学院上海天文台;
【基金】：国家自然科学基金项目(11303076)资助
【分类号】：P111.44
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本文编号：1904939