带内双频电磁辐射对频率步进连续波雷达的虚警干扰规律

False alarm interference laws of dual frequency electromagnetic radiation in band to stepped frequency continuous wave radar

为掌握带内双频电磁辐射对雷达的虚警干扰规律,以频率步进连续波雷达为研究对象,基于理论分析与效应试验,研究了虚警目标的电平变化规律、波形特征以及出现位置规律。结果表明:受试雷达在带内双频电磁辐射作用下,不考虑互调干扰时,至多产生两个位置随机的“山丘型”虚警目标,两者距离差与双频干扰频差有关。双频干扰中两分量互相压制,即当任一干扰分量强度恒定时,随着另一个分量的增强,前者形成的虚警目标电平缓慢下降,最终降速基本恒定,而后者形成虚警目标电平逐渐升高,直至电平恒定;若双频干扰信号两分量同比例增强,则两个虚警目标电平均在初期近似线性上升,而后增速逐渐降低至零。

In order to master the false alarm laws of dual frequency electromagnetic radiation in band to radar,the stepped frequency continuous wave radar was taken as the research object,based on the theoretical analysis and effect test,the level change law,waveform characteristics and location law of false alarm target were studied.Results show that:under the effect of dual frequency electromagnetic radiation in the band,the tested radar can generate at most two“hill type”false alarm targets with random positions without considering intermodulation interference,and the distance difference is related to the frequency difference of dual frequency interference.The two components of the dual frequency interference signal suppress each other,that is,if the intensity of one component is constant,with the enhancement of another component,the level of the false alarm target formed by the former decreases slowly and the final deceleration is basically constant,while the level of the false alarm target formed by the latter increases gradually until the level is constant.If the strength of the two components of the dual frequency interference signal increases in the same proportion,the levels of both two false alarm targets rise approximately linearly at the initial stage,and then the growth rate gradually decreases to zero.