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Main Page of the
Journal
Main Page of the WSEAS
May 2007,
June 2007,
July 2007,
August 2007, September 2007,
October 2007,
November 2007,
December 2007,
2008
WSEAS TRANSACTIONS
on
APPLIED and THEORETICAL MECHANICS
Issue 8, Volume 2, August 2007
Print
ISSN: 1991-8747
E-ISSN: 2224-3429 |
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Title of the Paper: Analytic Solution of Nadir Attitude Pointing
for LEO Microsatellite
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Authors: A.M. SI Mohammed, M. Benyettou, A. Boudjemai
H. Benzeniar, Y. Hashida, M.N. Sweeting
Abstract: An Analytic solution of Nadir attitude pointing equation of gravity gradient satellite stabilised is
presented. The attitude equation is Euler linearised equation for near Nadir pointing axially symmetric satellite
including only gravity gradient torque and assuming other torques such as magnetic torque, aerodynamic torque,
solar radiation pressure torque and controller are constants. The obtained analytical solution was compared to
numerical solution of satellite attitude equation.
Keywords: LEO, Microsatellite, Alsat-1, Analytic, Nadir, Attitude, Simulation.
Title of the Paper: Yaw Phase Mode Attitude Control
Using Z Wheel for LEO Microsatellite
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Authors: A.M. Si Mohammed, M. Benyettou,
A. Boudjemai, Y. Hashida, M.N. Sweeting
Abstract: A control system is proposed for a low Earth orbit gravity gradient stabilised microsatellite using Z wheel.
The microsatellite is 3-axis stabilized using a yaw reaction wheel, with dual redundant 3-axis magnetorquers. Two
vector magnetometers and four dual sun sensors are carried in order to determine the full attitude.
The attitude was estimated using an Euler angles (small libration version) on based extended Kalman filter (EKF).
After the satellite has been detumbled and deploy the gravity gradient boom, in order to have the accurate Nadir
pointing we will use the Z zero-bias mode controller. The Z momentum wheel will be damped by the magnetorquers.
This paper describes the attitude determination and control system design of LEO microsatellite using Z reaction
wheel for yaw phase mode control.
Keywords: Modelling, Simulation, Microsatellite, LEO, Attitude, Yaw, Control, Z Wheel, Magnetorquer.
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