雷达接收机的电磁兼容性分析

对于目前广泛使用的超外差式雷达接收机而言,其受到了来自寄生频率的严重干扰,为提高雷达接收机的整机性能,对其进行了电磁兼容性分析。主要针对影响最为严重的镜像干扰进行分析,使用了ADS软件建立了接收机的行为级模型,并分析了镜像干扰下的S参数和频谱。根据仿真结果,使用了合适的EMC整改措施。同时对改善后的接收机在相同条件下进行了仿真和分析,其镜像抑制比有明显提高,整机性能也得到了较大改善,为高性能的接收机设计提供了一种有效的EMC预评估方法。

Analysis of Electromagnetic Compatibility of Radar Receivers

The widely used superheterodyne radar receivers suffer from the spurious interference severely. An analysis of EMC is given by using the ADS to present the behavioral model of the radar receiver,with focus on the most severe image interference. The S parameter and the spectrum are analyzed. The methods of the EMC reinforcement are given based on the simulation results. The improved receiver is simulated under the same conditions. The results show that the IRR（ image rejection ratio） increases and the overall performance of the receiver is improved,providing an efficient method for the pre-evaluation of a receiver with good performance.