射电天文研究组知识库

为了进一步满足探月工程、深空探测和其他天文观测任务的需求，对设计初期只配置了一个S/X双频馈源的昆明40 m孔径全可动射电望远镜进行升级改造，研制了其换馈系统。在不改变现有天线结构及光路的基础上，拆除了原S/X双频馈源，安装了新的S/X双频馈源，并增加了C频段、Ku频段馈源；给出了换馈系统的详细设计和实施方案，实现了3个馈源间自动快速可靠的切换。对馈源改造之后的天线性能进行了测试，结果表明，天线的主要性能指标有所提升。馈源及换馈系统改造之后，大孔径全可动射电望远镜具有多频段接收能力，能够完成更多频段的天文观测和深空探测任务，提高了望远镜的观测效率和科研产出。 

In order to further meet the needs of lunar exploration, deep space exploration and other astronomical observation tasks, the Kunming 40 m aperture fully movable radio telescope, which was equipped with only one S/X dual-frequency feed source at the initial stage of design, was upgraded and its feed switching system was developed. On the basis of not changing the existing antenna structure and optical path, the original S/X dual-frequency feed source was removed, a new S/X dual-frequency feed source was installed, and the C and Ku frequency feed sources were added. The detailed design and implementation schemes of the feed switching system were given, and the automatic, fast and reliable switching among the three feed sources was realized. The performance of the antenna after feed modification was tested, and the results showed that the main performance indexes of the antenna were improved. After the modification of the feed source and feed switching system, the large aperture fully movable radio telescope had the ability to receive multiple frequency bands, and can complete the astronomical observation and deep space exploration tasks with more frequency bands, improving the observation efficiency and scientific research output of the telescope.