射电天文研究室知识库

针对新疆乌鲁木齐市南山25 m射电望远镜终端电磁屏蔽改造,以及新疆拟建的110 m射电望远镜电磁兼容性设计等需求,开发了电子设备辐射特性测试系统,基于标准噪声源Agilent346C,运用Y因子法对系统进行校准。通过关闭其它电子设备,分别打开和关闭测试设备获得环境电平频谱和设备辐射频谱;对测试数据进行了数据处理、成图与分析;给出了25 m射电望远镜典型终端电子设备的辐射频谱。针对终端电子设备辐射特性测试与分析,对系统电磁屏蔽改造提供重要依据。

In the developing radio astronomy increasingly more high-speed digital backend systems and control systems are being used，worsening electromagnetic environments for observation．Measurement of radiation characteristics of such electronic devices can help mitigate Ｒadio Frequency Interferences (RFI) with the shielding technology． To meet the requirements of electromagnetic compatibility of the system improvement for the XJAO ( Xinjiang Astronomical Observatory) Nanshan 25m telescope and the design of the planned XJAO 110m telescope，we have developed a system to measure radiation characteristics of electronic devices in radio astronomy．We have calibrated the system using a noise source Agilent 346C and the Y-factor method． Using the system we can obtain the radiation spectra of each electronic device in its on and off statuses with other devices turned off．We present some processed spectra of the backend systems of the Nanshan 25m telescope so measured by this system．The presentation includes their calibration and plots．The spectra show the radiation characteristics． Overall our system can provide ＲFI data for effective analyses，and thus it can appreciably help improving and designing systems in radio astronomy．It should have significant engineering applications．