Integration grade adjustment method of space camera

Abstract

The invention provides an integration grade adjustment method of a space camera. When the integration grade is adjusted automatically during the orbital photographing process, a needed camera entrancepupil radiance value is calculated simple by a fitted function, so that the real-time performance of the integration grade adjustment is improved. The adjustment process is completed automatically bya camera controller at an aircraft without ground intervention, so that the practicability and efficiency are improved. The integration grade calculation is based on a current real-time calculation row cycle, so that the camera is able to work in a full-row integration state as much as possible; and thus the signal-to-noise ratio is maximized while the image shift compensation requirement is met.With a large integration grade, the energy can be increased by several times or dozens of times. Because the integration grade is adjusted during the orbital photographing process, the dynamic rangeand working time of the space camera can be improved substantially and the adaptability to the photographic conditions can be enhanced.

Description

technical field [0001] The invention relates to the field of space cameras that use remote sensing satellites or space stations as platforms to observe the earth, in particular to a method for adjusting the integral series of space cameras. Background technique [0002] With the improvement of the pixel resolution of space cameras on the ground, the focal length of space cameras is getting longer and longer. At the same time, in order to avoid the size and weight of space cameras being too large, a larger F number and smaller pixel size are usually used, while the long The focal length of the camera leads to a shorter line period of the camera, which leads to less light energy entering the unit pixel of the space camera detector. For this reason, the current high-resolution space cameras usually use the Time Delay Integration (TDI) method to work. . The TDI method will perform multi-level superposition of energy signals of the same scene to solve the problem of insufficient...

AI Technical Summary

Problems solved by technology

Since a single photography may cover thousands of kilometers and span a large latitude, the lighting conditions at different ground objects vary greatly

Since the type and reflectivity of the ground objects to be photographed at the next moment are unknown, the integral series obtained by statistical analysis of the analog voltage or image data output by the imaging sensor acquired at the previous moment may not be applicable to the next step. The object of the ground object at any time, and the phenomenon that the integral series should be reduced but increased, resulting in the failure to achieve the adjustment purpose

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