用频装备带内多频电磁辐射阻塞干扰效应预测方法

Blocking jamming effect prediction method under multi-frequency in-band radiation environment for spectrum-dependent equipment

为解决用频装备复杂电磁环境效应准确评估的技术难题,从电磁辐射信号耦合传输的基本理论出发,推导揭示了射频前端线性不良和动态范围不足分别是导致用频装备电磁辐射效应对带内多频电磁辐射干扰场强有效值、幅值敏感的本质原因。在此基础上建立了2类用频装备的带内多频连续波电磁辐射效应模型,提出了通过正弦调幅波(调制深度100%)、单频连续波电磁辐射临界干扰场强有效值之比(Eame/Esine)确定受试装备电磁辐射敏感类型的方法。Eame/Esine>0.9时,受试装备对干扰场强有效值敏感,0.612<Eame/Esine<0.9时,受试装备对干扰场强幅值敏感。通信电台带内双频、三频电磁辐射效应试验验证表明:所提建模预测方法的误差小于10%,能够有效预测用频装备带内多频连续波电磁辐射效应。

In order to solve the technical problem of accurately evaluating radiation effects of spectrum-dependent equipment in complex electromagnetic environment,based on the basic theory of electromagnetic wave coupling transmission,this paper deduces and reveals that the poor linearity and insufficient dynamic range of RF front-end are the essential reasons why the electromagnetic radiation effect is sensitive to the effective value or amplitude of interference field strength.On this basis,two kinds of electromagnetic radiation effect models are established when the spectrum-dependent equipment is interfered by multi-frequency in-band continuous wave.And the method to judge the electromagnetic radiation sensitivity type of the tested equipment is proposed by the effective value ratio of critical interference field strength(Eame/Esine)of amplitude modulation wave(modulation depth 100%)and single-frequency continuous wave.When Eame/Esine>0.9,the tested equipment is sensitive to the effective value of interference field strength.And when 0.612<Eame/Esine<0.9,the tested equipment is sensitive to the amplitude of interference field strength.The dual-frequency and tri-frequency electromagnetic radiation tests are performed on difference communication equipment in this paper.The results show that the error of the forecasting method is less than 10%,and the proposed method can effectively predict electromagnetic radiation effect when the spectrum-dependent equipment is interfered by multi-frequency in-band continuous wave.