天线罩内大型天线副反射面及馈源更换技术

天线罩内空间紧凑，无法使用大型施工设备对大型部件进行施工改造。为了解决这一难题，文中研究了更换天线罩内大型天线副反射面及馈源的技术。提出了利用天线自身的俯仰运动进行吊装，并结合电葫芦长距离提升的优点，实现在天线罩内进行大型天线顶端吊装更换副反射面及馈源的施工方法。通过优化施工流程，分析关键位置的受力情况，形成了一套可行的施工方法，成功完成了大型副反射面及馈源的更换工作，且最终天线的各项结构和电气技术指标均满足要求。该方法首次应用于罩内大型天线副反射面及馈源的改造，可为后续该类大型天线的现场改造提供指导。

Replacement Technology of Large Antenna Secondary Reflector and Feed Source in Radome

The large construction equipment cannot be used to replace large components in the radome due to the compact space. To solve this problem the replacement technology of large antenna secondary reflector and feed source in the radome is studied in this paper. The construction method of lifting and replacing the secondary reflector and the feed source at the top of the large antenna in the radome is realized by using the pitching movement of the antenna itself in the lifting and combining the advantages of long-distance lifting of the electric hoist. By optimizing the construction process and analyzing the stress of the key positions, a set of feasible construction methods are formed and the replacement of large secondary reflector and feed source is successfully completed. The final structural and electrical technical indicators of the antenna meet the requirements. This method has been applied to the modification of the secondary reflector and the feed source of the large antenna in the radome for the first time, which can provide practical guidance for the subsequent on-site modification of the large antenna.