【作者】 张磊；

【导师】 张兴敢；

【作者基本信息】 南京大学 ， 信号与信息处理（专业学位）， 2014， 硕士

【摘要】 在复杂的电子环境中,雷达抗干扰性能已经成为电子对抗研究领域的一个重要课题。研究雷达有源干扰的抑制算法以及技术,可以提高已方雷达的抗干扰性能。本文针对现阶段国内外电子对抗技术现状,分析并了研究舰载雷达抗干扰的有效方法,主要内容如下：第一,分析了国内外典型干扰机参数,分析了典型的干扰类型。针对目前主要干扰机的参数,阐述了应答式干扰、转发式干扰、复合灵巧式干扰和分布式干扰产生的原理。研究了在出现以上干扰的情况下,雷达在截获目标时排除干扰的原理和方案。第二,在对干扰目标进行详细分析的基础上,对比分析了WVD时频分析、循环平稳分析、高阶统计量分析等低截获概率信号的截获方法,同时分析了循环平稳方法在截获低截获概率信号中的应用优势。第三,研究了常用的雷达反干扰信号波形以及在反干扰方面的巨大作用,并对这几种波形进行了详细的分析和对比。在以上分析的基础上,研究了线性调频信号、非线性调频信号、相位编码、频率编码和复合编码等编码方式,并对这几种编码方式的截获性能进行了对比分析。第四,研究了四种干扰抑制算法：副瓣连续波干扰抑制、副瓣脉冲干扰抑制、主瓣转发式假目标干扰抑制、主瓣连续波干扰抑制。并进行了对比分析和仿真验证。以上理论方法均通过仿真实验进行对比研究,最后通过反干扰试验进行了充分的验证,验证结果表明所述算法是非常有效的反干扰算法更多还原

【Abstract】 As the electronic circumstance is becoming complex, the study of ECCM(Electronic counter-countermearsures) is becoming much more important, and it’s one of the most important subject in EW. So it’s of great significant in national defense. In this dissertation, a study is performed about ECCM methods based on the circumstance in the world.Firstly, all the parameters of jammer and the way it obstructed are analyzed. Four kinds of theory are composed, including responder interference, forwarding interference, composite dexterous interference and distributed interference. Based on the theory above, some precepts are composed to solve the problems of interference.Secondly, based on the comparison and analysis of the jammer, some principles of intercepting low probability of intercept signal:WVD time-frequency analysis, smooth cycle analysis, higher order statistics analysis and so on. The advantages of smooth cycle analysis are analyzed.Thirdly, the signals of ECCM are put forward and compared. Some methods of keying are proposed, such as:LFM signal, nonlinear frequency signal, PSK, FSK, and complex keying.Fourthly, four kinds of interference suppression algorithm are put forward, including:side lobe continuous wave interference suppression, side lobe pulse interference suppression, main lobe interference suppression and forwarded the false target, main lobe continuous wave interference suppression. There are four ways to realize main lobe interference suppression and forwarded the false target, including: based on pulse edge detection of false target interference suppression, based on the dual separation of false target interference suppression, based on subspace projection airspace-polarization domain of radar active decoy interference suppression and based on fractional domain subspace projection of radar active decoy interference suppression.Lastly, all the thesis above are simulated. The experiment made lastly confirm that the effectiveness and of the theory.更多还原