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非均匀湍流路径光传播数值模拟中相位屏间C_n^2的选取 被引量:6
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作者 钱仙妹 朱文越 饶瑞中 《光学学报》 EI CAS CSCD 北大核心 2008年第10期1856-1860,共5页
针对非均匀湍流路径光传播的数值模拟,为减小相位屏间湍流强度均匀的假设所引起的模拟误差,数值分析了五种选择相位屏间折射率结构常数Cn2的可能方案。通过计算平面波和球面波的Rytov指数和Fried参数,对比五种方案得到的Rytov指数和Frie... 针对非均匀湍流路径光传播的数值模拟,为减小相位屏间湍流强度均匀的假设所引起的模拟误差,数值分析了五种选择相位屏间折射率结构常数Cn2的可能方案。通过计算平面波和球面波的Rytov指数和Fried参数,对比五种方案得到的Rytov指数和Fried参数与理论结果的相对误差。结果表明,当相位屏间C2n选择为相位屏间湍流大气实际的折射率结构常数的路径平均值时,模拟误差最小,该选择方案为相位屏间C2n选取的最佳方案;当根据相位屏间湍流大气的Rytov指数相等的原则来设置相位屏分布时,选择相位屏间C2n为两相邻相位屏处折射率结构常数的几何平均值时,在一定的误差允许范围内,该选择方案具有可取性。 展开更多
关键词 大气光学 光传播 折射率结构常数cn^2选取 数值模拟 非均匀湍流路径
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PRELIMINARY RESULTS OF ATMOSPHERIC TURBULENCE OBSERVATION WITH XIANGHE MST/ST RADAR 被引量:2
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作者 李卫 吕达仁 《Acta meteorologica Sinica》 SCIE 1998年第4期394-399,共6页
It has already been known by the meteorological community that MST radar is a powerful tool for wind profiling of the middle atmosphere.In fact,MST radar observation may also supply the temporal and spatial informatio... It has already been known by the meteorological community that MST radar is a powerful tool for wind profiling of the middle atmosphere.In fact,MST radar observation may also supply the temporal and spatial information of atmospheric turbulence in the middle atmosphere which is significant to our understanding the function and effect of turbulence in vertical transport of mass, energy,and momentum.Xianghe MST/ST radar was established in 1995 in its ST mode.This radar has the fast scanning ability which is favorable to reveal the structure of middle atmospheric turbulence.Preliminary results are described in this paper. 展开更多
关键词 MST radar turbulence scattering Fresnel reflection turbulence structure constant c_π~2
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