典型通信电台带内干扰辐射效应研究

针对通信电台易受电磁干扰的问题,实验用正弦波作为干扰信号对正常工作的某型号通信电台进行带内电磁辐射的效应研究.根据GJB中对电台受干扰等级划分的相关规定,确定各种干扰程度的干扰等级.实验中通过改变各种影响因素,测试各种条件下电台干扰门限值.实验结果表明:电台受到带内干扰时,干扰信号频率与电台工作频差为15kHz以内,被试电台干扰门限值很小,且变化很小；当频差超过15kHz时,干扰门限值随着频差的增大急剧增大,干扰频率与电台工作频率越接近,电台受到的干扰随场强的变化越敏感.并且,电台的功率对电台带内干扰的门限值也有一定影响.

Effects Research of Typical Communication Radio Radiated by Intraband Interference

Due to the vulnerability of a communication radio to electromagnetic interference,an experiment is carried out by using sine wave as jamming signal for a communication radio.According to the relevant regulations of the interference hierarchy in GJB,the interference degree level is determined.In the experiment,we change the various factors which can affecting the radio communication,and measure interference threshold when the radio is operating under various conditions.Experimental results show that when the interference signal frequency and radio’s working frequency difference is within 15kHz,the interference threshold is small,and variation is very little.When the difference exceed 15kHz,the interference threshold will change sharply.When the interference frequency approximates to the radio’s working frequency,the radio is more sensitive to the electromagnetic change.Besides,the radio’s working power has influence on interference threshold too.