Inversion method for in-orbit polarization radiation characteristics of non-polarization satellite sensor

Abstract

The embodiment of the invention provides a non-polarization satellite sensor in-orbit polarization radiation characteristic inversion method. The method comprises the following steps: acquiring satellite observation data of an ocean surface scene area obtained after an unpolarized satellite sensor is in orbit as a ground object observation target; preprocessing the satellite observation data; acquiring environmental data of the ocean surface scene area and preprocessing the environmental data to obtain ocean surface environmental data; utilizing the ocean surface environment data to construct an ocean surface three-dimensional model; based on the ocean surface three-dimensional model, the polarization radiation state of the ocean surface is simulated by combining the Fresnel reflection law. According to the method, the polarization radiation characteristics of the in-orbit non-polarization satellite sensor can be inverted and analyzed to obtain the polarization radiation state of the atmosphere top; the method analyzes the polarization sensitivity of the instrument along with observation geometry and environmental conditions to obtain a change rule of polarization radiation of the instrument along with different conditions, and has guiding significance for subsequent polarization correction and radiometric calibration of a non-polarization satellite sensor.

Description

technical field [0001] The invention relates to the technical field of satellite remote sensing, in particular to an inversion method for on-orbit polarized radiation characteristics of a non-polarized satellite sensor. Background technique [0002] In remote sensing detection, the radiation polarization state of ground objects can be used to retrieve wind speed, aerosol type and optical thickness, etc. There are related radiation polarization detectors at home and abroad that are mounted on satellites to detect and analyze polarization information. However, for non-polarized satellite sensors, polarization is a kind of interference information, and the polarization sensitivity of the radiation transfer link will affect the accuracy of remote sensing observation data and its subsequent applications. Inversion analysis and quantitative removal of the polarization sensitivity of the instrument are required to improve the radiation Calibration accuracy. [0003] The on-orbit p...

AI Technical Summary

Problems solved by technology

However, since some domestic satellite instruments in the past did not measure the polarization sensitivity of the laboratory before launch, and the characteristics of the instrument on orbit often deviate from the state of the laboratory before launch, it is necessary to use the specific remote sensing scene acquired by the non-polarized satellite sensor after the orbit Perform on-orbit polarized radiation characteristic inversion of the instrument, and analyze its polarization sensitivity, so as to more accurately correct and calibrate the on-orbit polarized radiation of the instrument

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