太赫兹引信面目标散射特性

doi:10.12382/bgxb.2021.0649

摘要/Abstract

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。

关键词: 太赫兹引信, 散射特性, 重排小波-伪魏格纳时频方法

Abstract:

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.

Key words: THz fuze, scattering characteristics, Mor-RPWVD

中图分类号:

TJ43⁺4.1

张广为, 栗苹, 张继豪, 章鸿运, 李国林, 贾瑞丽. 太赫兹引信面目标散射特性[J]. 兵工学报, 2023, 44(2): 360-367.

ZHANG Guangwei, LI Ping, ZHANG Jihao, ZHANG Hongyun, LI Guolin, JIA Ruili. Area Target Scattering Characteristics of Terahertz Fuze[J]. Acta Armamentarii, 2023, 44(2): 360-367.

图/表 9

图1 数据测量示意图

Fig.1 Data measurement diagram

图2 西藏地区典型面目标

Fig.2 Typical area target

图3 高寒干草地引信差频信号

Fig.3 Beat signal at alpine dry grassland

图4 高寒沼泽地引信差频信号

Fig.4 Beat signal at alpine swamp

图5 锯齿波调频频率时间关系

Fig.5 Sawtooth FM frequency-time relationship

图6 85°落角下高寒干草地时频分析

Fig.6 Alpine dry grassland time-frequency analysis under 85° fall angle

图7 85°落角下高寒沼泽地时频分析

Fig.7 Alpine swamp time-frequency analysis under 85° fall angle

图8 65°落角下高寒干草地Mor-RPWVD时频分析

Fig.8 Alpine dry grassland Mor-RPWVD time-frequency analysis under 85° fall angle

图9 65°落角下高寒沼泽Mor-RPWVD时频分析

Fig.9 Alpine swamp Mor-RPWVD time-frequency analysis under 65° fall angle

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