我国地区8～12μm波段大气透过率的MATLAB多项式拟合计算

Polynomial Fitting Calculation of Atmospheric Transmittance for the Areas of China in 8～12 μm with MATLAB

利用MATLAB提供的多项式拟合函数,对不同气象条件下我国地区8～12μm波段的LOWTRAN大气透过率数据进行拟合,给出了相应的多项式拟合系数。计算表明当多项式阶次取6时,拟合曲线与原始数据几乎完全重合,两者之间的误差绝对值绝大多数都在10-4数量级,甚至更小。拟合函数构造简单,使用方便,容易与各种软件平台集成。

Based on LOWTRAN computation, the atmospheric transmittance, under various weather conditions for different areas of China in 8-12 μm is fitted with MATLAB polynomial. Polynomial coefficients of the fitting function are presented. The results indicate that the fitting curves are in very good agreement with LOWTRAN calculations when the polynomial coefficient is 6. Most of the absolute errors between them are at 10--4 level, or even smaller. The fitting function of atmospheric transmittance is simple and can easily be integrated into different software platforms.