On-satellite radiometric calibration system and method for deep space exploration imaging spectrometer

Abstract

The invention discloses an on-satellite radiation calibration system and method for a deep space detection imaging spectrometer. The system comprises a cosine corrector, an integrating sphere, a calibration lamp, a baffle, an optical fiber, a control line and a controller. According to the system, a satellite-borne imaging spectrometer is designed and developed in the step (1), and after a satellite is launched and reaches an imaging target area, sunlight on-satellite radiometric calibration and integrating sphere light on-satellite radiometric calibration are carried out in sequence respectively; (2) on-satellite radiometric calibration coefficients for guiding sunlight and integrating sphere light arerespectively calculated toobtain two on-satellite radiometric calibration coefficients; (3) the difference between the two radiometric calibration coefficients is compared, and the optical radiometric calibration coefficient of the integrating sphere is corrected by using the sunlight radiometric calibration coefficient; and (4) the imaging data signal value isconverted into radiation brightness according to the on-satellite radiation calibration coefficient. According to the system and the method, the on-satellite radiometric calibration has timeliness and reliability, and the continuity and the effectiveness of the on-satellite radiometric calibration are ensured.

Description

technical field [0001] The invention relates to the technical field of deep space exploration, in particular to an on-board radiation calibration system and method for a deep space exploration imaging spectrometer. Background technique [0002] Hyperspectral imaging technology has the characteristic of map-spectrum integration, which can not only obtain two-dimensional image information related to the spatial characteristics of the imaging target, but also obtain spectral information related to the material composition of the target. Imaging spectroscopy technology is not only widely used in the fields of earth observation, medical identification, chemical analysis and testing, but also in the field of deep space exploration. A number of satellites have been launched at home and abroad for the detection of the material composition of celestial bodies such as the moon, Mars, and asteroids. These satellites are equipped with imaging spectrometers with different performances, a...

AI Technical Summary

Problems solved by technology

However, in the field of deep space exploration, due to various factors such as orbital period, imaging angle, and satellite load design limitations, it is impossible to continuously implement on-board radiation calibration with the sun as the light source, so that the on-board radiation calibration Timeliness and reliability cannot be guaranteed at the same time

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