On-satellite high-precision cross-calibration system

Abstract

The invention discloses an on-satellite high-precision cross-calibration system. The system comprises a one-dimensional pointing device, a calibration device, a control module, an optical system, a spectrograph, a detector, and a video module; the diffused light obtained by enabling the sun to irradiate a diffuse panel in the calibration device can be used for performing absolute radiometric calibration on itself; a scene image which is the same as other remote sensors can be acquired through the one-dimensional pointing device for the ground scene, and a cross-calibration method can be used for performing the cross-calibration on other remote sensors of the same platform. The photoelectric conversion is realized through the optical system, the spectrograph and the detector; an electric signal is output in a digital signal way after passing through the video module. The system disclosed by the invention can realize the acquisition of the diffused light of the diffuse panel and the acquisition of ground scene light in one set of system, and realize the higher precision absolute calibration on itself and the high-precision cross-calibration precision on other remote sensors.

Description

Technical field [0001] The invention relates to an on-board cross calibration system, which belongs to the technical field of aerospace optical remote sensors. Background technique [0002] With the rapid development of aerospace optical remote sensor technology, the demand for quantitative applications of remote sensors is also increasing. Affected by the space environment, the performance of the optical film and detectors of the optical remote sensor degrades with time. In order to ensure the validity of the output data, the aerospace remote sensor needs to be calibrated in orbit. The satellite-borne remote sensor adopts its own calibration device, cross calibration method or alternative calibration method for on-orbit calibration. Traditional cross-calibration uses high-precision remote sensors that are in orbit at the same time and match the bands as the cross-calibration reference. The data update rate is low, its timeliness is poor, and the period is long. At the same tim...

AI Technical Summary

Problems solved by technology

This method requires an integrated design with the camera, which will lead to complex optical paths and bulky cameras; most built-in calibration sources can only perform radiometric calibration on remote sensors, but cannot perform spectral calibration; built-in calibration boards and detectors are degraded Cannot be corrected; only a single remote sensor can be calibrated, and the ability to calibrate other remote sensors on the same platform cannot be realized

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