Area Target Scattering Characteristics of Terahertz Fuze

doi:10.12382/bgxb.2021.0649

Abstract

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

CLC Number:

TJ43⁺4.1

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.

Figures/Tables 9

Fig.1 Data measurement diagram

Fig.2 Typical area target

Fig.3 Beat signal at alpine dry grassland

Fig.4 Beat signal at alpine swamp

Fig.5 Sawtooth FM frequency-time relationship

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

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

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

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

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