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兵工学报 ›› 2006, Vol. 27 ›› Issue (1): 32-36.

• 论文 • 上一篇    下一篇

基于分数阶傅立叶变换的伪码体制引信线性调频干扰抑制技术

张淑宁1,赵惠昌1,吴兵2   

  1. 1.南京理工大学电光学院,江苏南京210094;2.山东理工大学物理学院,山东淄博255000
  • 收稿日期:2004-12-07 上线日期:2014-12-25
  • 通讯作者: 张淑宁
  • 基金资助:
    国防“十五”重点预先研究项目(413050305)

LFM Interference Excision Technique in Pseudo-random Code Fuse Based on Fractional Fourier Transform

ZHANG Shu-ning1, ZHAO Hui-chang1, WU Bing2   

  1. I.School of Electronic and Optoelectronic, Nanjing University of science and Technology, Nanjing 210094, Jiangsu, China; School of Physics, Shandong University of Science and Technology, Zibo 2)5000,Shandong, China
  • Received:2004-12-07 Online:2014-12-25
  • Contact: ZHANG Shu-ning

摘要: 分析线性调频( LFM)干扰对伪码体制引信相关检测性能的影响,结果表明当LFM干扰超出伪码体制引信自身抗干扰容限时,相关输出严重恶化,因此必须在相关检测前对LFM干扰进行抑制。通过对LFM干扰信号分数阶傅立叶变换计算结果的分析,提出在分数阶域进行LFM干扰抑制的方法;为避免固定门限方法在强干扰情况下造成有用信号的损失,提出了自适应门限的干扰抑制方法。通过仿真分析发现该方法能够有效消除LFM干扰,相关输出曲线明显改善,信干比得到显著提高。

关键词: 信息处理技术 , 伪码体制引信 , 分数阶傅立叶变换 , LFM干扰 , 自适应门限

Abstract: The influence of LFM interference on correlation detection performances of the pseudo-ran?dom code fuse was analyzed. It is found that the correlation output is deteriorated when the LFM in?terference power exceeds the anti-jamming limitation of the fuse itself. Thus, the LFM interference must be excised before correlation. By analyzing the fractional Fourier transform (FRFT) result of LFM signal, a method of excising LFM interference in fractal domain was put forward. To avoid the disadvantage of useful signal loss with the fixed threshold when strong interference exists, a method of adaptive threshold was proposed. Simulation results show that it can excise the LFM interference ef?fectively, ameliorate the correlation output and improve signal to jamming ratio.

Key words: information processing technique , pseudo-random code fuse , FRFT , LFM interference , adaptive threshold

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