An automatic full-spectrum radiation calibration reference target device

Abstract

The invention discloses a novel automatic full-spectrum radiation calibration reference target device, which relates to the technical field of aviation remote sensing, and may include a reflector assembly, a sun sensor assembly, an attitude control assembly and an electric control system; the attitude control assembly is connected to the The reflector assembly is connected to drive the reflector assembly to run; the sun sensor assembly is mounted on the reflector assembly, and the optical axis of the sun sensor assembly is aligned with the reflector normal of the reflector assembly parallel; the sun sensor assembly and the attitude control assembly are all connected to the electric control system. The present invention is applicable to full-spectrum radiation calibration of high-orbit and low-orbit optical remote sensing satellites, so as to realize absolute radiation calibration of satellite loads in different orbits in the solar reflection band, mid-infrared band and thermal infrared band (0.35 μm-12.5 μm). standard and image quality evaluation.

Description

technical field [0001] The invention relates to the technical field of aerospace remote sensing, in particular to an automatic full-spectrum radiation calibration reference target device. Background technique [0002] Radiometric calibration and imaging quality evaluation are the premise and basis for the quantitative application of optical remote sensing satellite image data, and one of the key links to promote the breadth and depth of remote sensing information product applications. [0003] Although the performance of the optical sensor has been strictly tested in the laboratory before launch, its imaging performance will decline to a certain extent due to the influence of many factors such as satellite launch vibration and acceleration, space operating environment changes, and component aging. It is necessary to conduct regular or irregular tracking and monitoring of the radiation characteristics and imaging quality of the satellite during its operation. [0004] Althou...

AI Technical Summary

Problems solved by technology

The French Space Research Center uses a high-energy spotlight as a reference target light source to perform on-orbit radiation calibration for SPOT satellites. However, the spotlight not only needs a high-power power supply, but also requires radiation calibration. In addition, there is a spectral difference between the spotlight light source and sunlight. Consistency, only able to cover the visible-near-infrared band, unable to achieve full-spectrum calibration and bring large errors to the test results

The United States uses convex mirrors to reflect sunlight to calibrate and evaluate Quickbird satellites. The convex mirror design as a reference target requires remote sensing load radiation calibration parameters, which are contradictory to their functions and have certain limitations. They are only applicable to solar reflection bands.

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