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为提高Monte Carlo激光传输模型中散射过程的处理精度,依据散射相函数的变化特征,提出了相函数分段加权采样方案,验证了其准确性与可行性。采用Monte Carlo方法模拟了在非球形沙尘气溶胶中,1.06μm红外激光透射率、反射率随传播距离的变化规律,并将Henyey-Greenstein(H-G)相函数采样与相函数均匀采样方案的Monte Carlo模拟结果进行了比较。仿真结果表明;相函数分段加权采样方案可显著降低相函数抽样误差,提高空间散射角抽样精度;与H-G相函数抽样的模拟结果相比,采用H-G相函数模拟的透射率偏低,反射率偏高,且随距离增大,两者结果偏差随之增大。与相函数均匀采样的模拟结果相比,两者计算的透射率偏差值随距离增大而增大,反射率反之。
In order to improve the processing accuracy of the scattering process in the Monte Carlo laser transmission model, a phase-weighted piecewise weighted sampling scheme is proposed based on the variation characteristics of the scattering phase function. The accuracy and feasibility of the proposed method are verified. Monte Carlo method was used to simulate the variation of transmittance and reflectivity of 1.06μm infrared laser in non-spherical sand aerosol. The Monte-Carlo method was used to simulate the Monte-Carlo method. Carlo simulation results were compared. The simulation results show that the segmentation function of phase function can significantly reduce the sampling error of phase function and improve the sampling precision of space scattering angle. Compared with the simulation results of HG phase function sampling, the HG phase function simulation shows that the transmittance is low and the reflectivity High, and with the distance increases, the resulting deviation between the two increases. Compared with the simulation results of uniform sampling of phase functions, the deviation of transmittance calculated by the two increases with the increase of distance, and the reflectivity conversely.