Abstract
The refractive index structure constant (Cn2) is a key parameter in describing the influence of turbulence on laser transmission in the atmosphere. A new method for continuous Cn2 profiling with both high temporal and spatial resolution is proposed and demonstrated. Under the assumption of the Kolmogorov “2/3 law”, the Cn2 profile can be calculated by using the wind field and turbulent kinetic energy dissipation rate (TKEDR) measured by coherent Doppler wind lidar (CDWL) and other meteorological parameters derived from microwave radiometer (MWR). In the horizontal experiment, a comparison between the results from our new method and measurements made by a large aperture scintillometer (LAS) is conducted. Except for the period of stratification stabilizing, the correlation coefficient between them in the six-day observation is 0.8389, the mean error and standard deviation is 1.09 × 10−15 m−2/3 and 2.14 × 10−15 m−2/3, respectively. In the vertical direction, the continuous observation results of Cn2 and other turbulence parameter profiles in the atmospheric boundary layer (ABL) are retrieved. More details of the atmospheric turbulence can be found in the ABL owe to the high temporal and spatial resolution of MWR and CDWL (spatial resolution of 26 m, temporal resolution of 147 s).
Highlights
Turbulence analysis is meaningful in many fields, such as astronomy (Ma et al, 2020), aviation safety (Storer et al, 2019), optical communication technology (Ren et al, 2013), laser weapons (Extance, 2015), wind field retrieval (Kumer et al, 2016), air pollution (Wei et al, 2020b), oceanography (Nootz et al, 2016), etc
Under the assumption of the Kolmogorov “2/3 law”, the Cn2 profile can be calculated by using the wind field and turbulent kinetic energy dissipation rate (TKEDR) measured by coherent Doppler wind lidar (CDWL) and other meteorological parameters derived from microwave radiometer (MWR)
To analyse the atmospheric turbulence in high resolution, we proposed a new method according to Tartarski’s theory
Summary
Turbulence analysis is meaningful in many fields, such as astronomy (Ma et al, 2020), aviation safety (Storer et al, 2019), optical communication technology (Ren et al, 2013), laser weapons (Extance, 2015), wind field retrieval (Kumer et al, 2016), air pollution (Wei et al, 2020b), oceanography (Nootz et al, 2016), etc. In areas of Free-Space Optical (FSO) communications and laser ranging, the fluctuation of the refractive index caused by atmospheric turbulence will affect the coherence of the laser beam through the optical angle-of-arrival fluctuation, laser beam wander and scintillation (Libich et al, 2017), etc. These phenomena will bring uncertain variance and 30 reduce the detection efficiency of these systems. Five typical sets of 12-min continuous turbulent profiles
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