移频转发密集假目标干扰效应分析与应用研究

Effect analysis and application of dense false target jamming using frequency shift repeater

以线性调频脉冲压缩雷达为干扰对象,深入分析移频转发干扰对其干扰机理,建立起失配干扰峰值、假目标时延、假目标主峰宽度等干扰效应与干扰参数的解析表达式,然后从工程应用角度出发,设计出阶梯波移频、线性函数移频、分段线性函数移频三种典型移频方法,并通过仿真实验逐一进行验证和对比分析。结果表明,采用阶梯波移频方法,移频干扰可产生多个距离假目标;采用线性移频方法,移频干扰可产生单个遮盖假目标;采用分段线性移频方法,移频干扰可产生多个遮盖假目标;组合其中2种或更多种方法,还会产生更复杂的干扰效果。通过完成移频转发密集多假目标干扰影响效应的定量表征,为其工程应用奠定基础。

The LFM pulse compression radar is taken as the jamming object,and the jam mechanism of frequency shift repeater jamming(FSRJ)is deeply analyzed. The analytical expressions of jamming effect and jamming parameters such as mismatch jamming peak value,false target delay,false target main peak width are also established. From the perspective of engineering,three typical types of frequency shift method are designed,including stepped wave frequency shift,linear function frequency shift and segmented linear function frequency shift. The influence of frequency shift is verified and compared by simulation. Results show that FSRJ can produce multiple range false targets using the stepped wave frequency shift method,a single blocked false target using linear frequency shift method,and multiple covered false targets using segmented linear frequency shift method. The combination of two or more methods will produce more complex effects. Through the quantitative characterization of the effect of FSRJ over dense multiple false target interference,it can lay the foundation for its engineering application.