On-track space camera gain regulating method

A technology of a space camera and an adjustment method, which is applied in the direction of a photographic device, etc., can solve the problems of large difference in image grayscale, insufficient image layers, and overall dark image, and achieves the effects of high accuracy, high precision, and improved processing efficiency.
CN103322982AActive Publication Date: 2013-09-25CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Publication Date
2013-09-25

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Abstract

The invention discloses an on-track space camera gain regulating method, which relates to an on-track gain regulating method of a space camera for earth observation, and aims to the solve the problems that at present, a space camera adopts a fixed gain so as to lead to overall dimming of part of images, poor image gradation, low signal to noise ratio and the like. The regulating method comprises the following steps of: before a spacecraft is launched, acquiring a gain factor corresponding to the maximal digital quantification output value of images under maximal radiance through laboratory radiometric calibration; after the spacecraft is launched, simulating the track of the spacecraft with high accuracy, and outputting the solar altitude of sub-satellite points at different shooting time; converting the solar altitude into the solar zenith angle, thereby obtaining the radiance of an entrance pupil part by an MODTRAN atmospheric radiation transfer tool when the space camera forms images of a ground feature corresponding to the maximal object reflectivity at different time; calculating gain factors of the space camera at different shooting time; combining the code values corresponding to the gain factors obtained through calculation with the shooting time into a program control instruction, and sending the program control instruction from a ground measurement and control station to the spacecraft to execute through a measurement and control antenna.
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Description

technical field

[0001] The invention relates to a space camera for observing the earth by using a remote sensing satellite or a space station as a platform, in particular to an on-orbit adjustment method for the gain of the space camera. Background technique

[0002] When the space camera is photographing the ground, there are significant differences in the reflectivity of ground objects, such as the reflectivity of sea water is about 0.05, while the reflectivity of ice and snow can reach up to 0.8. At the same time, the lighting conditions in different seasons and latitudes are different, resulting in large changes in the radiance at the entrance pupil of the space camera. In order to avoid the saturation of the target of interest in the remote sensing image acquired by the space camera and make it impossible to distinguish, the user requires the space camera to meet the maximum radiance requirement, that is, the output image under the maximum radiance condition is close to...

Claims

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