机载雷达与对抗设备的电磁兼容问题解决方法分析

Analysis on EMC Solutions between Airborne Radar and Electronic Countermeasure Equipment

提出了机载火控雷达天线副瓣辐射与机载电子对抗设备之间的互干扰问题,并对通道干扰问题进行详细分析,指出传统时分制解决方法的不足,即当一个电子设备工作时,与它会产生相互干扰的其它设备必须停止工作。进而提出了用陷波法和禁止信号法解决此问题的原理和实现方法,重点就禁止信号法分析了其效果和可能对设备性能产生的影响。通过实验分析得出用陷波法和禁止信号法可以较好地解决雷达和电子对抗设备之间的相互电磁干扰问题。其中,陷波法适用于频率稳定、窄带宽的脉冲多普勒(PD)雷达,禁止信号法对于精确测频系统效果更好。

The mutual interference problem between side lobe radiation of airborne fire control radar antenna and airborne electronic countermeasure equipment is introduced and analyzed. Limitations of traditional solution to this problem are also discussed. By using traditional method, when one of electronic equipment is operating, another must be stopped. Then principles and implementation methods of both ＂Notch Filter＂ and ＂Inhibit Signal＂ are discussed and the channel interference problem is solved by using these two methods. Especially, effects on equipment characteristics that may be caused by Inhibit Signal method are analysed. Through discussion and experiment analysis, the conclusion is drawn that ＂Notch Filter＂ and ＂Inhibit Signal＂ methods can be well used to solve EMC problems between airborne radar and electronic countermeasure equipment. ＂Notch Filter＂ is suitable for PD radar with stable frequency and wide narrowband, and the ＂Inhibit Signal＂ is more suitable for accurate frequency measurement system.