射电天文研究室知识库

射电望远镜的表面精度除了受到面板加工及装配精度影响以外,在实际使用中还要受到重力变形,温度变形以及风载的影响.对于高频观测,微小的表面变形将对望远镜的观测性能带来较大影响.相位恢复全息方法是一种利用远场幅值进行表面检测的方法.因其不需额外的设备,同时具有测量方便及运行速度快的优点,在天线反射面测量领域获得了广泛的研究和应用.本文将对其中运用最广泛的Misell算法和OOF(Out of Focus)算法进行探讨,并通过仿真标准卡塞格伦天线对两种算法进行对比分析.

Surface accuracy of radio telescope is not only affected by machining and installation but also affected by the gravity distortion, temperature and wind. For the high frequency observation, a little distortion of reflector surface can lead a great effect on the performance of the telescope. Phase retrieval holography is a kind of diagnosis method by using the amplitude distribution of far field patterns. The advantages of simple equipment and convenient calculation make the phase retrieval algorithm get wide research and application. This paper investigated the methods of Misell algorithm and OOF algorithm. Through simulation of Cassegrain radio telescope, a comparative analysis between Misell algorithm and OOF algorithm would be discussed.