准直光束上行传输稳态热晕的全局敏感性分析

Global Sensitivity Analysis of Uplink Steady-State Thermal Blooming for a Collimated Beam

引入全局敏感性分析方法,研究典型传输场景下113个输入参数的不确定性对热畸变参数(ND)数值模型的影响。通过主效应检测将输入参数分为对ND影响重要的参数和不重要的参数;把主效应检测筛选出的不重要参数固定后,采用基于方差的敏感性分析方法定量评估20个重要输入参数对ND的影响。结果表明,低空大气参数的影响较大,它们既可以直接对ND产生影响,也可以通过和其他参数相互作用对ND产生影响;对ND影响最重要的参数是低空大气吸收系数。所得结果能够指导实际工作中大气参数的测量和模式的构建。

Herein,global sensitivity analysis is performed to analyze the numerical model of the thermal blooming distortion parameter（ND）with 113 uncertain input factors in typical transmission scenarios.First,the elementary effect test ranks factors in order of their importance and screens insensitive factors.Next,variance-based sensitivity analysis quantifies the sensitivity of the important factors and investigates the interactions between factors.Our results reveal that the atmospheric characteristics in the propagation paths first few kilometers affect NDthe most.These characteristics can either affect NDalone as well as with other factors.The most important parameters are atmospheric absorption coefficients at low attitude.These findings can guide the measurement and model construction of atmospheric parameters.