Publication Date:
2023-08-09
Description:
Optical turbulence in the atmosphere is one of the most important factors that cause blurring in satellite images. To express the impact of this turbulence on satellite imaging payloads, the optical turbulence modulation transfer function (MTF)has been used. The main focus of the current research is to provide a specific model to make it possible to estimate MTF caused by turbulence and error compensation in recorded satellite images. Due to the extremely variable nature of atmospheric turbulence, it is not possible to provide a comprehensive model for estimating the strength coefficient of turbulence. In this research, due to the lack of a specific model to determine the atmospheric turbulence of Tehran city, in Iran, some models for the three levels close to the ground, the boundary layer, and the free atmosphere have been specifically calibrated. To this end, models and satellite meteorological data of the European Center for Weather Forecasting (ECMWF) validated by the radiosonde data have been used to estimate atmospheric turbulence and boundary layer height for some case studies in 2021 over the Tehran area, Iran. Results show the effective (estimation of the entire imaging path) had its maximum value of about 1.5x10〈sup〉-11〈/sup〉 in the warm season and a minimum of 5.6x10〈sup〉-13〈/sup〉 in winter. The simulation results of the index have been used to directly estimate the MTF of atmospheric optical turbulence assuming isotropic Kolmogorov turbulence and short exposure. MTF results also vary from 0.86 in summer to 0.94 in winter due to direct dependence.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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