Method for verifying on-orbit absolute radiometric calibration result of optical load

Abstract

The invention discloses a method for verifying an optical load on-orbit absolute radiometric calibration result. The method comprises the following steps: selecting an underlying surface and a calibration field based on calibration field target characteristics and atmospheric measurement data; synchronously measuring target reflection characteristic parameters and atmospheric parameters of the calibration field on the ground, and processing the synchronously measured data on the ground; the method comprises the following steps: acquiring image data based on a satellite-borne optical sensor, processing the image data, and extracting a corresponding channel calibration coefficient of the sensor; calculating a radiance simulation value at the entrance pupil of the satellite-borne optical sensor of the calibration field by using an atmospheric radiation transmission model; calculating the relative difference between the equivalent radiance simulation value and the equivalent radiance observation value at the entrance pupil of the satellite-borne optical sensor of the calibration field; based on the error transfer theory, carrying out single-field verification uncertainty evaluation, and obtaining single-field verification uncertainty; and based on an international measurement basis comparison result analysis method, determining a weight coefficient of each field by taking single-field verification uncertainty as a component, and synthesizing a multi-test-field comprehensive foundation verification result and total uncertainty.

Description

technical field

[0001] The invention relates to the technical field of remote sensing, in particular to a method for verifying the on-orbit absolute calibration results of optical loads. Background technique

[0002] After the satellite is launched, due to the vibration and changes in the working environment during the launch process, especially the impact of mechanical shock, weightlessness, vacuum, space radiation, etc., as well as the interference of the instrument itself and external factors, the radiation performance of the optical load is often different from the performance of the pre-launch test. There are obvious deviations, and simply using the laboratory calibration results before launch cannot reflect the real radiation performance of the payload during its orbital operation. For example, the United States conducted a ground radiation calibration on the Coastal Zone Color Scanner (CZCS) launched in 1979, and found that the performance of its short-wave part dropp...

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