Novel automatic full-spectrum radiometric calibration reference target device

Abstract

The invention discloses a novel automatic full-spectrum radiometric calibration reference target device, and relates to the technical field of the aerial remote sensing. The device comprises a reflector module, a sun sensor module, an attitude regulation and control module and an electric control system; the attitude regulation and control module is connected with the reflector module and used for driving the reflector module to rotate; the sun sensor module is arranged on the reflector module, and an optical axis of the sun sensor module is parallel to a reflector normal of the reflector module; and the sun sensor module and the attitude regulation and control module are connected with electric control system. The device disclosed by the invention is suitable for the full-spectrum radiometric calibration of high-orbit and low-orbit optical remote sensing satellites, thereby realizing the absolute radiometric calibration and image quality assessment of satellite loads at different orbits at the sun reflection waveband, the middle infrared waveband and the hot infrared waveband (0.35 micron to 12.5 micron).

Description

technical field [0001] The invention relates to the technical field of aerospace remote sensing, in particular to a novel 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] A...

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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