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Wheel control small satellite adaptive integral sliding mode attitude controller

An attitude controller and integral sliding mode technology, applied in attitude control and other directions, can solve the problem of sacrificing control accuracy, achieve high robustness, reduce chattering amplitude, and optimize control torque

Inactive Publication Date: 2019-03-08
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology

However, the above two methods have certain limitations. The former requires a certain understanding of the disturbance torque, while the latter can handle unknown disturbance torque, but it will sacrifice a certain control accuracy.

Method used

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  • Wheel control small satellite adaptive integral sliding mode attitude controller
  • Wheel control small satellite adaptive integral sliding mode attitude controller
  • Wheel control small satellite adaptive integral sliding mode attitude controller

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Such as figure 1 As shown, the attitude controller designed by the present invention is applied to the small satellite attitude tracking control system. The working process of the small satellite attitude tracking control system is as follows: firstly, the small satellite receives the command sent from the ground, and the star computer calculates the current attitude and the expected The attitude difference is transmitted to the designed attitude controller. The attitude controller calculates the control voltage according to the error information and transmits it to the flywheel mechanism. The flywheel mechanism generates torque to act on the small satellite, and the attitude sensor calculates the current attitude of the small satellite. And the information is passed to the posture detection computer to complete a closed-loop control cycle.

[0034] The present...

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Abstract

The invention provides a wheel control small satellite adaptive integral sliding mode attitude controller. For the influence of the flywheel friction torque and the external disturbance torque on theattitude control precision of the small satellite, a disturbance observer is designed to compensate the flywheel friction torque, and a sliding mode variable structure is introduced to achieve the control of the uncertain external disturbance robust. Aiming at the chattering problem of sliding mode controller, the adaptive law is designed for the switching gain to weaken the chattering, and an adaptive integral sliding mode controller is designed based on the disturbance observer and the adaptive law, and the controller is high in precision and small in chattering.

Description

technical field [0001] The invention relates to an adaptive integral sliding mode attitude controller for wheel-controlled small satellites, belonging to the technical field of spacecraft control. Background technique [0002] In recent years, with the development and maturity of micro-electromechanical technology and space technology, small satellites have attracted more and more attention. The tasks performed by small satellites have a lot to do with their attitude control. For example, to realize the observation task of ground targets, small satellites are required to have a high-precision staring attitude toward the ground; to realize the task of charging solar panels on small satellites, it is necessary Small satellites are required to have a sun-oriented attitude. [0003] In order to achieve high-precision attitude control, flywheels are generally used as torque actuators on small satellites. For small satellites, the disturbance torque is the main reason affecting ...

Claims

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Application Information

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IPC IPC(8): G05D1/08
Inventor 杨新岩倪淑燕廖育荣张亚坤曹永奎杨玉敏陈世淼
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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