太赫兹引信面目标散射特性  

Area Target Scattering Characteristics of Terahertz Fuze

作　　者：张广为 栗苹[1] 张继豪 章鸿运 李国林[1] 贾瑞丽[1] ZHANG Guangwei;LI Ping;ZHANG Jihao;ZHANG Hongyun;LI Guolin;JIA Ruili(Science and Technology on Electromechanical Dynamic Control Laboratory,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机电动态控制重点实验室,北京100081

出　　处：《兵工学报》2023年第2期360-367,共8页Acta Armamentarii

基　　金：军委科技委基础加强项目(202020201062)。

摘　　要：采用多种时频方法研究了西藏地区两种典型面目标(高寒干草地和高寒沼泽)回波信号的时频特性,揭示常规弹药太赫兹引信在经典落角65°、85°下的面目标双点散射现象。分析小波、WVD时频方法在引信面目标回波实际应用中的局限性,并进行理论说明。针对频率成分提取过程中的成分丢失和频率成分能量聚集性差问题,提出一种新的重排小波-伪魏格纳时频(Mor-RPWVD)方法。Mor-RPWVD采用距离加权和时频信息融合,进一步提高时频方法的交叉项干扰抑制能力和能量聚集性。实测数据验证结果表明,重排小波-伪魏格纳(Mor-RPWVD)时频方法对面目标多点散射回波信号的良好时频分析能力。Multiple time-frequency analysis methods are used to study the echo signal scattering characteristics of two typical area targets(semi-desert grassland and alpine swamp) in Tibet. The results reveal the two-point scattering phenomenon of area targets of the terahertz fuze under the typical angle of falls of 65°and 85°. Based on Geometrical Theory Diffraction(GTD), the area target echo model of a terahertz fuze is established. The echo signal characteristics of multi-point scattering area targets and the application limitations of multiple time-frequency methods are analyzed. To address the problems of the loss of frequency components and the poor frequency component energy concentration in the analysis process, a new wavelet-rearrangement pseudo-Wigner time-frequency analysis method(Mor-RPWVD) is proposed. Distance weighting and time-frequency information fusion are employed to further improve the cross-term interference suppression ability and energy concentration of the time-frequency method. The analysis of the measured data has verified the good time-frequency analysis ability of wavelet-rearrangement pseudo-Wegener(Mor-RPWVD) under multi-point scattering conditions.

关 键 词：太赫兹引信 散射特性 重排小波-伪魏格纳时频方法 

分 类 号：TJ434.1[兵器科学与技术—火炮、自动武器与弹药工程]