基于模糊函数切割法的线性调频连续波引信抗干扰性能测度

Anti-jamming Performance Evaluation of Linear Frequency-modulated Continuous Wave Fuze Based on Ambiguity Function Incision

在分析有源干扰机理和模糊函数理论的基础上,提出用模糊函数切割法测度线性调频连续波无线电引信的抗干扰性能。即根据引信的工作原理及其接收机的信号处理方法切割一定高度下的模糊图,计算截面面积来测度无线电引信的抗干扰性能,面积越小说明其抗干扰性能越强。通过对调频引信模糊函数切割图面积随其特征参数变化规律的研究,得出:相同的调制带宽下锯齿调频连续波引信的抗干扰性能强于对称三角调频连续波引信的抗干扰性能,且随着调制带宽增大,两者的抗干扰性能差距缩小;调制周期对两者的抗干扰性能影响较小。计算实例表明该方法客观、合理,且具有可计算性,可应用于工程实践。

Based on the analysis of active jamming mechanism and ambiguity function,the methodology of ambiguity function incision evaluating the anti-active-jamming performance of linear frequency-modulated continuous wave（LFMCW） fuze was put forward.The area of the ambiguity function incision is computed at a certain height which is determined by the radio fuze principle and its receiver signal processing.The smaller the computed area becomes, the stronger the anti-jamming performance gets.This methodology was applied to the evaluation of the anti-jamming performance of linear frequency modulated continuous waveform ranging fuze.It demonstrates that the anti-jamming performance of saw-tooth frequency modulated continuous waveform ranging fuze is stronger than that of symmetrical frequency modulated continuous waveform ranging fuze,and the anti-jamming performance difference of them becomes smaller when the modulation bandwidth becomes wider;the effect of modulation time on LFMCW fuze is small.The computed results by an example show that the evaluation methodology is impersonal,reasonable and computable,which can be use for practical purposes.