Spacecraft distributed load pose three-exceeding control method

Abstract

The invention relates to a spacecraft distributed load pose three-exceeding control method which is suitable for a large satellite platform with ultrahigh precision, ultrahigh stability and ultrahighagility for the relative attitude between two loads. The method is different from a traditional PID control algorithm. According to the method, combining the robustness characteristic of sliding modecontrol on a sliding mode surface and the characteristic that parameters can be estimated on line through self-adaptive control, a star attitude-load relative attitude two-stage composite control method is provided. A load relative attitude controller is used for fine control over the load relative attitude, a body attitude controller is used for achieving rapid attitude maneuver and restraining low-frequency vibration, and ultra-precise, ultra-stable and ultra-sensitive (three-super) control over the load relative attitude is achieved. The multi-stage cooperative control thought is as follows: 1) using a feedforward + feedback controller to realize high-precision pointing control of a load relative attitude, and giving a controller parameter design method through load inertia; and 2) designing a robust adaptive controller considering bandwidth constraints for the spacecraft body, ensuring that the spacecraft body controller can be effectively matched with the load controller through aparameter design method, and realizing two-stage composite control.

Description

technical field [0001] The invention belongs to the field of attitude control of spacecraft, and relates to a three-superior control method for distributed loads and attitudes of spacecraft. Background technique [0002] With the increasing demand for astronomical observation and on-orbit services, the design ideas and practices of contemporary large-scale satellite platforms have undergone revolutionary changes, the complexity of satellite control systems has continued to increase, and the attitude accuracy and stability requirements of satellite payloads are also moving towards individual In order to realize the development of specialization and refinement, imaging satellites usually carry two optical payloads. In order to realize imaging, the relative attitude between the two payloads needs to have extremely high accuracy and stability. Therefore, it is necessary to develop a new type of "super-precision , ultra-stable, and ultra-agile" performance of payload relative att...

AI Technical Summary

Problems solved by technology

[0004] The simple PID control algorithm can only achieve gradual stability of the system, and cannot guarantee the rapidity of state quantity convergence; adding feedforward control can increase the speed of attitude tracking error convergence, but it will additionally arouse the vibration of the flexible attachment, which requires active pointing In the control of the ultra-quiet platform, further feedback control is performed on this part of the vibration to increase additional energy consumption

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