High-precision imaging attitude pointing control method based on agile satellite

Abstract

A high-precision imaging attitude pointing control method based on the agile satellite is provided. The method comprises that: an attitude maneuvering process is planned according to the specified ground imaging target and time; in the maneuvering process, the attitude prediction information and the corresponding time are calculated and transmitted to a star sensor according to a fixed frequency;the star sensor predicts the sky window according to the time and attitude data, and keeps trying to extract the attitude in a window tracking mode; the satellite moves to the vicinity of the target and gradually decelerates, the star sensor captures the satellite attitude information quickly in a high-precision manner, and the system uses double star-sensitive optical axis vectors to compete attitude reset; and finally, closed-loop correction is performed by using the difference between the reset attitude and the target attitude to complete the high-precision attitude pointing control. According to the method provided by the present invention, the star-sensitive high-precision attitude information available only at small angular velocities is fully used to compensate for the influence ofgyro measurement information with nonlinear and drift variation characteristics on imaging pointing precision.

Description

technical field [0001] A high-precision pointing control method for imaging attitude based on agile satellites proposed by the present invention is suitable for the pointing control algorithm of low-orbit remote sensing satellites with agile attitude maneuverability for ground imaging. approach to precision issues. Background technique [0002] With the continuous development of remote sensing satellites, especially detailed survey satellites, agile mobile imaging is a technology that is more concerned at present. Agile maneuvering means that the satellite platform has the capability of rapid attitude maneuvering in a wide range, and the control scheme of controlling the moment gyro group is generally adopted to realize rapid scanning and high-resolution imaging of hotspot areas. The system requirements and design concept of detection integration also require the satellite to have high attitude pointing accuracy. [0003] The GF-11 agile detailed survey remote sensing sate...

AI Technical Summary

Problems solved by technology

During the maneuvering process, the measurement error of the large-range gyro accumulates, which affects the pointing accuracy of the system; the system uses star-sensitive information to correct the attitude and performs feedback control according to the correction amount, and the corrected angular velocity of the system during the correction reduces the stability of the system attitude

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