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采用蒙特卡罗法建立了各向异性散射介质中高斯脉冲激光的全链路瞬态辐射传输模型,构造并推导了散射方向概率模型及其坐标系变换过程。在此基础上,计算分析了高斯脉冲激光回波特性的时域分布及差异。研究结果表明:时域回波信号的脉冲增减来自于其他类别信号的转化和自身信号的超前或滞后;随着前向散射的增强,目标回波信号强度增大、峰值时刻前移、时间展宽减弱,散射回波信号响应与其相反且影响程度减弱;目标回波特性与[0°,90°]前向散射区域直接关联,散射回波特性与[90°,180°]后向散射区域直接关联。研究结论可为脉冲激光主动探测系统的性能提升及地物目标的反探测隐身提供理论指导。
A full-line transient radiative transfer model of Gaussian pulsed laser in anisotropic scattering medium was established by Monte-Carlo method. The probability model of scattering direction and its coordinate system transformation were constructed and deduced. On this basis, the time domain distribution and the difference of Gaussian pulse laser echo characteristics are calculated and analyzed. The results show that the pulse amplitudes of time-domain echo signals come from the transformation of other types of signals and the leading or lagging of their own signals. With the enhancement of forward scattering, the intensity of the target echo signal increases, the peak moment moves forward, the time The spread of the scattering signal is opposite to that of the scattering echo signal. The target echo characteristic is directly related to the [0 °, 90 °] forward scattering region. The characteristics of the scattering echo are similar to those of [90 °, 180 °] The scattering area is directly related. The research conclusion can provide theoretical guidance for the performance improvement of the active detection system of pulsed laser and the anti-detection stealth of the object.