Attitude compensation method of agile satellite imagery in reverse push-broom mismatch

Abstract

The invention discloses an attitude compensation method of agile satellite imagery in reverse push-broom mismatch. Aiming at the defect (only considering the drift current effect brought by earth rotation) of the attitude compensation method in the traditional imagery mode (the satellite directing over the ground is fixed), through analyzing the generation reason of a drift angle under the imagery mode of constantly changing satellite reverse push-broom attitude directing over the ground (constantly changing attitude directing over the ground under the condition of mismatch between the substellar point speed and the camera push-broom speed), the drift current effect of imagery is considered from three aspects (orbital motion, earth rotation and camera push-broom speed), a drift current angle calculation formula under the mode is obtained according to the orbital attitude parameters combining the basic definition of the drift angle, on the basis, the satellite attitude compensation method is obtained by combining the basic principle of TDICCD (time delayed and integration charge coupled device) imagery and the yaw control principle, and the imagery requirement of agile satellite reverse push-broom can be satisfied.

Description

technical field [0001] The invention relates to an attitude compensation method for agile satellite imaging. Background technique [0002] During the imaging process of optical remote sensing satellites, there will be a certain deviation between the target imaging point and the actual imaging point due to factors such as orbital movement, earth rotation, attitude maneuvering, and camera working push-broom mode. measure. [0003] For the sub-satellite point imaging mode, the calculation formula of the drift angle has been mature; for the deviation from the sub-satellite point imaging mode, in "Calculation and Compensation of the Drift Angle of Spaceborne TDI-CCD Push-broom Camera" (Shanghai Aerospace Science and Technology, 6th issue of 2006) In this paper, Yuan Xiaokang deeply deduced the formula for calculating the drift angle of the camera during azimuth offset and elevation offset imaging, and proposed a method of using satellite yaw control to compensate the camera drif...

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Problems solved by technology

[0004] (1) In the imaging mode mentioned in the article, the imaging width of the spaceborne remote sensor is small, and the imaging range is small, usually a small circular or rectangular area, which cannot effectively cover the regional target. The imaging task is single; the attitude compensation technology in the above mode is based on the drift angle attitude control when the attitude is fixed to the ground pointing, but the drift angle attitude compensation technology under the condition that the attitude is constantly changing to the ground pointing in the reverse push-broom imaging of the satellite has not yet been implemented. give specific measures

[0005] (2) In this paper, it is assumed that the moving speed of the sub-satellite point matches the surface push-broom speed of the camera, and the attitude compensation of the drift angle only considers the drift angle caused by the rotation of the earth, and the attitude compensation has great limitations: in the above mode The attitude compensation method is only suitable for the case where the moving speed of the sub-satellite point is consistent with the speed of the camera push-broom, that is, the situation where the satellite is pushing-broom along the orbit, and cannot meet the situation when the moving speed of the sub-satellite point of the agile satellite does not match the speed of the camera push-broom

The satellite attitude compensation method based on the drift angle in the traditional mode (the moving speed of the sub-satellite point is consistent with the camera push-broom speed) can no longer meet the attitude adjustment requirements of agile satellite imaging

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