Simulation on Transmission Characteristics of Laser in Chaff Cloud Environment

doi:10.12382/bgxb.2023.1002

Abstract

Abstract:

The laser fuzes are easily affected by chaff clouds, but the interference characteristics of chaff clouds on laser have not been sufficiently studied, Therefore,a laser transmission characteristic model in the chaff cloud environment is established. The diffusion models of chaff clouds under no wind/wind conditions are developed, and the diffusion models of chaff clouds at stability stage under different environments are obtained. The similarity of the interference effects of main disturbing clouds of chaff cloud in the absence/possession of wind is determined based on the laser transmission characteristic models. The scattering characteristics of single chaff under different morphologies are studied based on Fresnel principle. The chaff cloud is segmented, and a propagation model of laser in chaff cloud environment is established by using the continuous field Monte Carlo radiation transfer model. In this propagation model, a laser echo model with or without target in the chaff cloud environment with different central concentrations can be obtained. The laser echo model is verified by comparing the simulated data with the measured data. It is concluded that the chaff cloud interference echo has the characteristics of narrow pulse width and high peak value, and the continuous frequency of chaff cloud interference echo is positively correlated with the concentration of chaff cloud. The laser echo model can provide support for research on anti-chaff cloud interference of laser fuze.

Key words: pulsed laser, chaff cloud, fresnel principle, monte carlo radiation transfer model, echo model

CLC Number:

TJ43+9.2

TAN Yuran, ZHA Bingting, ZHENG Zhen, ZHANG He, HE Rui. Simulation on Transmission Characteristics of Laser in Chaff Cloud Environment[J]. Acta Armamentarii, 2024, 45(12): 4597-4611.

Figures/Tables 34

Fig.1 Chaffs with different lengths

Fig.2 Chaff cloud interference

Fig.3 Schematic diagram of chaff dispersing

Fig.4 Decomposition diagram of chaff subjected to air resistance

Fig.5 The relationship between descent height and horizontal distance at different θ

Fig.6 Horizontal distance-time curves of chaffs with different lengths

Fig.7 Height-time curves of chaffs with different lengths

Fig.8 Stress analysis diagram of chaff

Fig.9 Analysis of fretting dynamics

Fig.10 Clumped chaffs

Fig.11 Motiontrajectories of chaff cloud

Fig.12 Diffusion of chaff cloud with different chaff lengths

Fig.13 Simulation diagram of chaff clusters

Fig.14 Schematic diagram of photon colliding with chaff cylinder

Table 1 Chaff basic characteristics and environmental information

物理变量	数值
空气折射率n₁	1
箔条折射率n₂	2.0522
θ_i/(°)	(0,90)

Fig.15 Relation between energy flow reflectivity amplitude and incident azimuth angle

Fig.16 Relation between energy flow transmittance amplitude and incident azimuth angle

Fig.17 Schematic diagram of photon path

Fig.18 Hierarchical chaff cloud

Fig.19 Photon scattering path

Table 2 Preliminary chaff bomb test results

序号	箔条弹发数	中心浓度/ (g·m^-3)	是否误发火
1	1	11.81	否
2	2	23.62	否
3	3	35.43	是

Table 3 Simulation parameter Settings

仿真参数	数值
光子数	10000
发射半角φ_t/mrad	5
接收视场半角φ_r/mrad	87
接收半径r_r/mm	14
收发间距d₀/mm	58
采样时间/ns	0.5
发射脉宽/ns	10
衰减系数/m^-1	0.031
散射系数/m^-1	0.032
中心浓度/(g·m^-3)	35.43

Fig.20 Normalized transmitted signal and received echo signal with 10ns pulse width

Fig.21 Echo signals with different transmitting pulse widths

Fig.22 Echo signals with different laser wavelengths

Fig.23 Relation between response amplitude and distance

Fig.24 Laser echo simulation of target and chaff cloud

Fig.25 Normalized transmitted signals and received echo signals

Fig.26 Heterogeneous chaff cloud echo simulation

Fig.27 Laser echo simulation of chaff cloud with target

Fig.28 Measured chaff cloud and target echo

Fig.29 Scene diagram of pulse laser echo characteristics test under chaff cloud condition

Table 4 Experimental result

序号	浓度/ (g·m^-3)	信号采集时间/ms	是否有箔条回波	有效回波数量	回波幅值均值/V
1	11.81	50	无	0
2	11.81	50	无	0
3	23.62	50	无	0
4	23.62	50	无	0
5	35.43	50	有	13	4.36
6	35.43	50	有	15	4.43

Fig.30 35.43g/m3 chaff cloud partial echo

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