A Simple Method to Estimate the Refractive Index Structure Parameter (${C}_{n}^{2}$) in the Atmosphere
Wu Su, Changdong Su, Xiaoqing Wu, Tao Luo, Xuebin Li
Abstract
This paper proposes a simple physics-based method for estimating the profile in the lower atmosphere, using the Ellison scale as a measure of the outer turbulence scale. The new approach only Requires the temperature profile as an input to obtain the profile of the outer turbulence scale, followed by the profile. Using sounding data from Lhasa (Tibet) profiles were estimated using three outer scale models (Thorpe, HMNSP99, and Ellison) and compared with the measured profile. Results show that the Ellison scale method offers better results as a profile estimator than the other two methods. Compared with the measured profile, the average relative error of the Ellison scale method is generally lower than 8%, with a correlation coefficient larger than 0.5.