副面旋转换馈法关键技术及其应用实例

Key Technologies and Application Examples of Sub-reflector Rotary Feeds-switching Method

文中介绍了一种新的换馈方法——副面旋转换馈法,该种换馈方法主要应用在大型射电望远镜上,通过旋转副面的方式实现天线工作馈源的切换。副面旋转换馈法的实现需要以天线副面二次赋型为理论基础、以高精度换馈机构为依托、以高刚度副面支撑结构为前提。文中根据某工程实例分析了该种换馈方法的换馈原理、关键技术以及实现方法,为以后的工程应用提供参考。

A new feeds-switching method,sub-reflector rotary feeds-switching method,is introduced in this paper.The method is mainly applied to large radio telescope.The switching of the working feed is realized by rotating the sub-reflector.The realization of the sub-reflector rotary feeds-switching method needs the theory base of the re-shape of antenna's sub-reflector,the reliance of the high-precision feeds-switching mechanism,and the premise of the high-stiffness supporting structure of the sub-reflector.In this paper,the feeds-switching principle,realization method and key technology of this method are analyzed based on an engineering example,which can provide a reference for future engineering applications.