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为系统客观地评价某通信系统的抗电磁干扰能力,提出一种以误码率为评价指标的电磁干扰效应实验方法,确定了不同干扰信号对该通信系统的作用规律,分析了干扰机理,结果表明:同频干扰时,在产生误码功率的前2 d Bm,误码率逐渐增大,而后1 d Bm范围内,误码率迅速增加到0.47,干扰功率与发射功率呈线性变化;误码率达到10-2数量级,话筒发出吱吱声,达到0.47时显示屏出现死机现象;偏离发射频率2 MHz范围内的信号易产生干扰;带外强干扰信号会使通信系统减敏,干扰功率与信号频偏呈正比;互调干扰的两路信号同步变化时,其功率与发射功率呈线性关系,反之功率与信号频率之间的关系相同;扩频或RS编码可提高通信系统对同频小信号的抑制效果,而对邻频干扰,扩频反而使系统更易受到干扰,且产生干扰的功率区间变宽。
In order to systematically evaluate the anti-electromagnetic interference ability of a communication system, an experimental method of electromagnetic interference with bit error rate as the evaluation index is proposed to determine the effect of different interference signals on the communication system. The interference mechanism is analyzed. The result The results show that the bit error rate increases gradually in the first 2 d Bm when the co-channel interference occurs and the bit error rate increases rapidly to 0.47 in 1 d Bm range, and the interference power changes linearly with the transmission power. The code rate of 10-2 order of magnitude, the microphone squeaks, reaching 0.47 when the screen appears dead phenomenon; deviation from the launch frequency of 2 MHz range of signals prone to interference; with strong interference signal will make the communication system desensitization, interference power and The frequency deviation of the signal is proportional to the intermodulation interference of the two signals simultaneously changes, the power and transmit power was linear relationship, whereas the power and signal frequency of the same relationship between the spread spectrum or RS code can improve the communication system for the same frequency small Signal suppression effect, and the adjacent frequency interference, spread spectrum but make the system more susceptible to interference, and the interference power range becomes wider.