群体雾粒子散射模型及散射角谱研究
Light scattering model and angular spectrum of scattering intensity in fogs
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摘要: 如何提高制导精度是研制制导系统所要关心的问题，在有雾的天气情况下，群体雾粒子的散射是影响制导精度的重要因素之一。在Mie理论的基础上，从单个球形粒子的散射效率因子出发，得到了1～6μm群体粒子的散射系数。根据布格尔定律导出了群体粒子对激光束的散射光强表达式，然后在接收器视场角范围内，模拟了散射光强的分布情况。结果表明，沿着激光束的传播方向，散射光强存在比较大的起伏，并且越靠近接收器的视场中轴线，散射光强有减少的趋势。Abstract: Scattering of the atmosphere particles such as fogs is one of the important factors which limit the precision of laser control and guide. Based on Mie's theory,the scattering efficiency factor of a spherical particle is analyzed, the scattering coefficient of spherical particles 1~6 μm in radius is presented. According to Bouguer's theory the expression of the scattering intensity of particles is obtained. Then in the field of view of the receiver, the distribution of scattering intensity is simulated. The simulation results show that, in the orientation of propagation, the scattering intensity exhibits undulation, and approaching the axial orientation, the scattering intensity tends to decrease．
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