Full-view-field column radiation ratio determining method of spaceborne optical remote sensor

Abstract

The invention relates to a full-view-field column radiation ratio determining method of a spaceborne optical remote sensor. The method comprises steps that 1) simulated input data including observation time, observation point coordinates, a geomagnetic activity parameter, a solar activity index, an observation area parameter and an atomic physics parameter is modeled by obtaining all essential factors; 2) a universal radiation transmission model is established and simulated; and 3) data of the radiation transmission model is obtained and processed, and the full-view-field column radiation rateof the optical remote sensor is calculated. According to the observation time, observation point coordinates, observation direction angle, geomagnetic activity parameter, solar activity index and thelike, a spherical geometric method is used, factors including atmosphere density change and solar elevating angle change of a target area are considered in an integrated manner, the column radiationrates corresponding to different observation directions of the full-view-field of the optical remote sensor are calculated accurately, and basis is provided for analysis on the radiation characteristic of the observation area and researches on image simulation and image reversion algorithms.

Description

technical field [0001] The invention relates to a method for determining the column radiance rate of the full-field of view of a space-borne optical remote sensor, in particular to a push-broom or scanning-type space-borne optical remote sensor for observing far-ultraviolet band spectral radiation signals in the upper atmosphere. The field of optical remote sensing radiation algorithm. Background technique [0002] In the field of optical remote sensing, it is increasingly becoming mainstream to observe the far-ultraviolet spectral radiation in the upper atmosphere from space with spaceborne optical remote sensors. The spectral radiation signals in the far ultraviolet band obtained by optical remote sensors can not only monitor changes in the density components of atoms and molecules in the upper atmosphere, but also obtain space weather information such as magnetic storms and ionospheric storms in the upper atmosphere. Therefore, it is of great significance to observe the ...

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Problems solved by technology

[0007] The conventional radiation determination method in the visible light band is to stratify the observation area using the parallel plane geometry method, and usually use a relatively coarse layer to describe the atmospheric density change in the observation area, because the radiative transmission of visible light is mainly affected by the lower atmosphere of the earth, while The radiative transmission of far-ultraviolet radiation is mainly affected by the upper atmosphere of the earth. If the method of parallel plane geometry is still used for layering processing, the density change of the upper atmosphere of the earth cannot be described in detail. Second, the traditional radiation determination method in the visible light band not only needs to consider the change of atmospheric density, but also needs to consider the influence of atmospheric aerosol, water vapor and other factors, so the influence of multiple scattering needs to be considered in the calculation of radiation transfer, and the calculation amount is relatively large, and the radiative transmission of far-ultraviolet radiation is mainly affected by the absorption of some major atmospheric components in the upper atmosphere of the earth, and there is no need to consider the multiple scattering effect

At present, there is no relevant research on the method of determining the radiance rate of the far-ultraviolet radiation column in the upper atmosphere of the earth in China, and only a small amount of research work on the calculation principle of radiative transfer has been published abroad

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