Multistage cooperative control method based on active pointing ultra-quiet platform

Abstract

The invention relates to a multistage cooperative control method based on an active pointing ultra-quiet platform, which is suitable for the fields of astronomical observation, high-resolution earth observation and the like with load ultra-high precision determination requirements. On the basis of a two-stage control system of a star attitude control system and a fast reflecting mirror, an ultra-static platform with a pointing function is installed between a spacecraft star and a load, and a three-stage control system composed of first-stage star attitude control, second-stage load attitude control and a third-stage fast swing mirror is formed. And high-precision control of an expected attitude is realized. Aiming at a novel spacecraft platform three-level composite system, the invention provides the multistage cooperative control method based on the active pointing ultra-quiet platform, and designs a star first-level system control law, a load second-level system control law and a fast reflecting mirror third-level system control law; and on the premise that a system response requirement is met, multi-stage multi-bandwidth composite control is achieved, and a cooperative control problem among a star body, a load and a fast reflecting mirror is solved.

Description

technical field [0001] The invention belongs to the field of attitude control of spacecraft, and relates to a multi-level cooperative control method based on an active pointing ultra-quiet platform. Background technique [0002] Attitude tracking control is an important problem in the field of spacecraft control, and the demand for high-precision and high-stability attitude tracking control in engineering practice is increasingly urgent. Existing high-precision attitude tracking systems usually adopt a composite control strategy of rough tracking + fine tracking. By using the wide-angle measurement sensor to search for the target and roughly track the expected attitude, the narrow-field imaging closed-loop locks the target, and the high-bandwidth fast-swing mirror realizes closed-loop adjustment. Composite control requires two or more control systems to be implemented in series. [0003] The coarse tracking of the James Webb Telescope for astronomical observations is mainl...

AI Technical Summary

Problems solved by technology

[0004] On the one hand, constrained by the torque output and the large inertia of the whole star, the attitude control bandwidth of the star is low, the error of tracking and aiming is large, and there will be a long stabilization time at the end of the maneuver. Requirements, leading to the contradiction between the size of the field of view and the measurement accuracy

On the other hand, multi-source vibrations on the star lead to low stability during the maneuvering and aiming process of the payload, and it is urgent to install a vibration isolation platform between the star and the payload

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