A multi-axis maneuvering imaging satellite yaw attitude control method considering the ellipticity of the earth

Abstract

According to a yaw attitude control method of a multi-axis maneuver imaging satellite with ellipticity of the earth considered, satellite rolling and attitude maneuver conducted in pitching are considered, misalignment of an optical axis of optical load and a collimation axis of the optical load are also considered, and the defect that a traditional control method can be adapted only to satellite side wing maneuver and the optical axis is aligned with the collimation axis is overcome. In the process of obtaining a linear speed of a ground target point relative to a satellite, the speed is divided into three parts of a linear speed caused by earth rotation, a satellite orbit operation speed and an operation speed of the ground target point relative to the satellite caused by satellite orbit angular velocity. In the solving process of the satellite optical axis pointing to a ground target point vector, the rotating ellipsoid feature of an actual earth model is considered, coordinate transformation is introduced, simpleness and convenience of the method are guaranteed, and obtaining of high precision drift angle attitude is achieved. The yaw attitude control method of the multi-axis maneuver imaging satellite with ellipticity of the earth considered is suitable for simultaneous maneuver of the multi-axis of the satellite, and meets the usage requirements of most high precision to-earth imaging satellites at present.

Description

technical field [0001] The invention belongs to the field of satellite attitude control, and relates to a yaw attitude control method in the satellite attitude maneuvering process. Background technique [0002] When the camera on the satellite remotely senses the image of the ground target, due to the relative motion between the captured target point and the camera, the image formed by the target point on the camera image plane is not static, and this phenomenon is called image motion. Image motion will degrade image quality and reduce resolution, so image motion must be compensated. The process of image motion compensation involves two concepts: bias angle and speed-to-height ratio. [0003] The bias angle is the angle between the moving direction of the image motion compensation system and the direction of the image motion velocity. For film-type remote sensing satellites, mechanical image motion compensation is usually used, and the drift angle is the angle between the ...

AI Technical Summary

Problems solved by technology

[0004] The traditional drift angle acquisition method generally simply regards the earth as an ideal sphere, and only considers the calculation of the drift angle when the satellite has a roll attitude, so this drift angle acquisition method is not suitable for the simultaneous maneuvering of the satellite on two axes

At the same time, due to the lack of consideration of the influence of the earth's ellipticity, when the satellite attitude angle is large, the calculation of the drift angle has a maximum calculation error of more than 0.5 degrees, which can no longer meet the current control and use requirements of high-precision satellites

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