基于近场扫描的移动通信卫星EMC性能评估

针对移动通信卫星射频载荷产生的系统内和系统间复杂电磁兼容性问题,以及批产化研制特点带来的非专门电磁兼容性试验验证评估需求,提出了一种基于近场扫描的电磁兼容性评估方法。针对卫星载荷的辐射影响,采用柱面近场扫描获得载荷的近场辐射特性,用于系统内的电磁兼容性分析。基于近远场变换技术获得远场辐射特性,用于星座系统间的电磁兼容性评估。给出了探头补偿方法和扫描步进优化方法来提高测试准确度和测试效率。仿真和试验校验证明了方法的有效性。将该方法应用到卫星系统内和系统间电磁兼容性(electromagnetic compatibility, EMC)分析评估中,结果表明方法可有效满足工程应用需求。

EMC performance evaluation of mobile communication satellites based on near-field scanning

A evaluation method based on near-field scanning is proposed to solve the complex intrasystem and intersystem electromagnetic compatibility (EMC) problem caused by the radio frequency payload of the mobile communication satellite, and the development needs in the experiment verification and evaluation of non-special EMC caused by the characteristics of batch production. Aiming at the radiation effect of satellite payload, the cylindrical near-field scanning method is used to obtain the near-field radiation characteristics of the load for the intrasystem EMC analysis in the system. And the intersystem EMC evaluation of the satellite constellation is analyzed based on the near to far field transformations which obtains the far field radiation characteristics. The probe compensation and scanning step increasing methods are also proposed to improve the test precision and efficiency. The effectiveness is proved by the simulation and test validation. The method has been used in evaluating the intrasystem and intersystem EMC, and the results demonstrate the effectiveness of the proposed method in engineering applycation.