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基于Mie散射理论利用偏振相关的Monte Carlo仿真方法对圆偏振光在水平大气中传输进行建模仿真。仿真结果表明:在大气能见度为5 km、传输距离为11.16 km条件下,接收光斑中心处保偏性能很好,且优于接收光斑边缘处保偏性能。进行了11.16 km水平大气链路左旋圆偏振光退偏实验,实验结果表明:在大气能见度为5~10 km,大气折射率结构常数C2n=1.825×10-13m-2/3条件下,左旋圆偏振光经过长距离水平大气信道传输后偏振旋向不发生改变;接收光斑中心处保偏性能良好,优于接收光斑边缘处,和仿真结果趋势一致。
Based on the Mie scattering theory, the polarization-dependent Monte Carlo simulation is used to simulate the transmission of circularly polarized light in the horizontal atmosphere. The simulation results show that the polarization maintaining performance at the center of the receiving spot is good at the distance of 5 km and the transmission distance is 11.16 km, which is better than the polarization maintaining performance at the edge of the receiving spot. The experimental results show that under the conditions of atmospheric visibility of 5 ~ 10 km and atmospheric refractive index structure constant C2n = 1.825 × 10-13m-2/3, the left-hand circular polarization The polarization rotation does not change when the polarized light passes through the long-distance horizontal atmospheric channel. The polarization maintaining performance at the center of the receiving spot is better than that at the edge of the receiving spot, which agrees with the simulation results.