某机载天线伺服系统电磁兼容设计及分析

Design and Analysis of Electromagnetic Compatibility Problems of Airborne Antenna Servo System

本文采用近场电磁干扰源探测定位法分析了某机载天线伺服系统的辐射发射问题。通过对比测试数据确定码盘及开关电源为主要辐射源,针对码盘和开关电源辐射超标的问题采用屏蔽、接地和滤波等措施进行整改。在设计共模滤波器时使用仿真软件CST对滤波器的参数进行仿真,最后通过电磁兼容试验验证整改效果,确定伺服系统的电磁兼容性有明显的改善。

In this paper, electromagnetic interference sources detection method is used for the analysis of radiated e-mission problem of the airborne antenna servo system. By comparing the test data, it is confirmed that the main source of radiation is the encoder and switching power supply. In order to solve the problem of the encoder and switch power source radiation exceed the standard, a series of measures such as shielding, grounding and filtering are adopted to carry out rectification. The parameters of filter are simulated using the CST simulation software in the design of common mode filter. Furthermore, the rectification effect is verified by the electromagnetic compatibility test. It is found that the electromagnetic compatibility of the servo system is improved obviously.