A Method for Adjusting the Integral Series of Space Camera

Abstract

The invention provides a method for adjusting the integral series of a space camera. The entrance pupil radiance of the camera used for automatically adjusting the integral series during orbit photography is obtained through simple calculation of a fitted function, which improves the real-time adjustment of the integral series. The adjustment process is automatically completed by the camera controller on the spacecraft without ground intervention, so it is more practical and efficient. The calculation of the integral series is based on the current real-time calculation line cycle, which can ensure that the camera works as much as possible at full line integral State, while meeting the requirements of image motion compensation, maximize the signal-to-noise ratio, using a large integral series can achieve energy multiplication from several times to tens of times, and automatically adjusting the integral series during orbit photography can greatly increase Significantly improve the dynamic range and working time of the space camera, and enhance the adaptability to photographic conditions.

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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