某型雷达连续波电磁环境效应研究

Effects of Continuous Wave Electromagnetic Environment on Radar Equipment

为有效评估雷达装备在复杂电磁环境下的作战效能,以某型雷达为研究对象,研究连续波电磁干扰对雷达目标回波电平的阻塞效应。基于接收机的非线性理论,开展电磁辐照试验,试验过程中发现当干扰频偏超出一定范围后,现有试验条件不足以压制有用信号,为此采用注入与辐照相结合的方法研究雷达装备电磁敏感度特性。以雷达目标回波电平受到同等压制效果作为等效依据,从雷达接收信号角度出发,理论分析电磁辐照法和注入法的等效性,试验验证连续波电磁辐照和注入法的可行性和准确性。结果表明,在同等压制效果下,接收机接收到的辐射场强与注入场强比值均约等于1,注入法与辐照法具有良好的等效性,为研究装备电磁环境效应奠定了基础,具有一定的工程实用价值。

In order to effectively evaluate the combat effectiveness of radar equipment in complex electromagnetic environment,taking a certain type of radar as the research object,the blocking effect of continuous wave(CW)electromagnetic interference(EMI)on radar target echo level was studied.Based on receiver nonlinear theory,the electromagnetic irradiation test was carried out.It is found that when the interference frequency offset exceeds a certain range,the existing test conditions are not enough to suppress the useful signal.Therefore,the method of combining injection with irradiation was used to study the characteristics of electromagnetic sensitivity of radar equipment.Based on the equivalent suppression effect of radar target echo level,from the perspective of radar receiving signal,the equivalence of electromagnetic radiation and injection was theoretically analyzed,and the feasibility and accuracy of CW electromagnetic radiation and injection method were verified by experiments.The results show that under the same suppression effect,the ratio of the radiation field strength received by the receiver to the injection field strength is constant about 1;injection method and irradiation method have good equivalence.The results lay a foundation for studying the electromagnetic environment effect on equipment and have certain engineering practical value.