DocumentCode :
2910008
Title :
Attitude control of a piezo-strut mounted camera on a spacecraft with deployed solar panels
Author :
Kayastha, Sharmila ; Akbulut, Burak ; Tekinalp, Ozan ; Ozgoren, Kemal
Author_Institution :
Aerosp. Eng. Dept., Middle East Tech. Univ., Ankara, Turkey
fYear :
2011
fDate :
5-12 March 2011
Firstpage :
1
Lastpage :
14
Abstract :
A nonlinear two loop quaternion based state dependent Ricatti equation (QSDRE) control and an LQR control based on linearized system equations are designed to improve the pointing performance of a large Earth Observation camera carried by a spacecraft with deployed solar panels. The system is modeled as eight bodies, a spacecraft, a high resolution camera, four solar panels, two in each side, and two yokes for connecting solar panels to spacecraft. The spacecraft and camera is connected by piezoelectric actuators to damp out vibrations, and a satellite mounted reaction wheel cluster to realize slew maneuvers. The Newton-Euler method is employed for the derivation of the multi-body equations of motion. Different pointing metrics such as accuracy, jitter and stability are used to evaluate the pointing performance of the camera. The effectiveness of this two loop QSDRE control as well as LQR control for improving the pointing performance of the camera are examined through simulations. The simulation results of both controllers are then compared and discussed from pointing performance point of view.
Keywords :
Riccati equations; aircraft control; attitude control; cameras; control system synthesis; linear quadratic control; linear systems; nonlinear control systems; piezoelectric actuators; Earth Observation camera; LQR control; Newton-Euler method; attitude control; deployed solar panels; linearized system equations; loop QSDRE control; nonlinear two loop quaternion based state dependent Ricatti equation control; piezoelectric actuators; piezostrut mounted camera; satellite mounted reaction wheel cluster; spacecraft; state dependent Ricatti equation control; Cameras; Equations; Joints; Mathematical model; Quaternions; Space vehicles; Vibrations;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Aerospace Conference, 2011 IEEE
Conference_Location :
Big Sky, MT
ISSN :
1095-323X
Print_ISBN :
978-1-4244-7350-2
Type :
conf
DOI :
10.1109/AERO.2011.5747478
Filename :
5747478
Link To Document :
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