Area-array camera in-orbit relative radiation calibration method based on satellite attitude adjustment

Abstract

The invention discloses an area-array camera in-orbit relative radiation calibration method based on satellite attitude adjustment, and the method comprises the steps: enabling the setting of CCD imaging parameters of a focal plane of a satellite to be consistent before the satellite carries out the attitude adjustment to-ground imaging; selecting a ground uniform dark target, wherein the uniformdark target can be covered by satellite imaging in multiple rows; adjusting the satellite to a normal posture under the condition that the uniform dark target can be covered by multiple rows of satellite imaging to obtain an image of the uniform dark target, counting the DN value of the image, and taking the average DN value as a system dark signal; adjusting the attitude of the satellite, enabling the long-side direction of the CCD area array of the satellite to be consistent with the flight direction of the satellite, imaging to the ground to obtain a ground image, and enabling the satelliteto return to the normal attitude of the satellite; carrying out image processing on a ground image, carrying out in-orbit relative calibration on the processed image, dynamically obtaining a relativeradiation calibration coefficient according to the satellite operation and the response consistency of an area array optical camera, and ensuring the in-orbit relative calibration precision.

Description

technical field [0001] The invention relates to an on-orbit relative radiation calibration method for an area array camera based on satellite attitude adjustment, and belongs to the technical field of radiation calibration. Background technique [0002] Imaging optical cameras will be calibrated on the ground before the satellite is launched, but they must be recalibrated after they are in orbit to eliminate the degradation of imaging performance caused by the drift of calibration coefficients and particle pollution. Since these scaling changes are more or less independent between probes, on-orbit relative scaling is necessary. Relative calibration, as the name implies, does not require the transfer or calibration of absolute radiation values, but only focuses on the radiation response performance differences between the detectors of each channel of the photoelectric imaging / detection system and between the array detector pixels and how to eliminate such differences . The ...

AI Technical Summary

Problems solved by technology

In the sunlit area, the ocean is an ideal uniform field but the brightness is not enough to calibrate the entire dynamic range of the device well

There are many relatively uniform desert targets in North Africa, but not large enough for on-orbit relative calibration of most optical cameras

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