| 其他摘要 | In this article, we studied the adjustment , test and precision analyze of the panel of Cassegrain antenna, show that the Cassegrain antenna’s panel is very important for Cassegrain antenna’s performance. In this article, we specified that the course about the 40-diameter Cassegrain antenna – which has just built in Yunnan Observatory of Chinese Academy of Sciences for our country lunar project-- of the panel’s installation, adjustment and test , ultimately we gained the conclusion that the precision of entity panel is 0.256mm, the precision of reticulation panel is 0.496mm, which was achieved and exceeded the request of antenna design. From the electricity performance of the test about 40-diameter Cassegrain antenna, the sidelobe level in the pattern about X band is -19.3 dB, the sidelobe level in the pattern about S band is -22.9 dB, the gain of S band is 58.25 dB , the gain of X band is 66.39 dB , which was achieved and exceeded the request of antenna design. It has also showed that the panel adjustment of 40-diameter Cassegrain antenna was succeeded . In this article, in order to know the total system of 40-diameter Cassegrain antenna, we specified the basic the performance, such as pattern, gain and so on, and we introduce the instance of VLBI and the constitute of Cassegrain antenna’s platform, such as front part, terminal part ,and correlation apparatus。 In the master study, I have taken part in the manufacture of 40- diameter Cassegrain antenna cryogenic receiver, have benefited a lots, and which have been showed in chapter 4, Ultimately, we show that the actuality and future of lunar project. |
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