On-orbit multi-traceability spectral radiometric calibration method for deep space exploration imaging spectrometer

Abstract

The invention discloses an on-orbit multi-traceability spectral radiometric calibration method for a deep space exploration imaging spectrometer. The method comprises the following steps of: (1) carrying out sun-oriented calibration when a surrounding device reaches a far celestial body orbit of a surrounding device orbit; (2) after the sun-oriented calibration data is acquired, calibrating a cold space and an integrating sphere; (3) deducting dark backgrounds in the sun-oriented calibration radiation data and the integrating sphere calibration radiation data, respectively calculating spectral radiometric calibration coefficients, and calibrating a radiometric calibration coefficient for integrating sphere calibration by using the spectral radiometric calibration coefficients for sun-oriented calibration; (4) when the surrounding device arrives at a near-celestial-body orbit, acquiring imaging spectrum data and dark background data at the same time; and (5) converting imaging spectrum data into radiation brightness by using an obtained on-orbit spectral radiometric calibration coefficient. According to the on-orbit multi-traceability spectral radiometric calibration method, the calibration coefficient deviation caused by the radiation intensity of the integrating sphere is overcome, and the real-time performance, the continuity and the data accuracy of on-orbit radiation calibration are ensured.

Description

technical field [0001] The invention relates to the technical field of deep space detection, in particular to an on-orbit multi-traceable spectral radiation calibration method suitable for deep space detection imaging spectrometers. Background technique [0002] Hyperspectral imaging technology is an imaging technology that can obtain not only the two-dimensional spatial information of the detection target, but also the multi-spectral spectral information of the detection target. Imaging spectroscopy technology has the advantages of strong detection ability and strong recognition ability. It is not only widely used in food safety, medical diagnosis, mineral resources, military defense and other fields, but also in the field of deep space detection. In recent years, a number of orbiters equipped with imaging spectrometers have been launched at home and abroad. These orbiters have played an irreplaceable role in the detection of the material components of the moon, asteroids, ...

AI Technical Summary

Problems solved by technology

However, due to the influence of factors such as the orbital period of the orbiter, the imaging angle, and the load design of the orbiter, the imaging spectrometer cannot continuously calibrate the sun

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