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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(More)
This paper presents an analysis and comparison of attitude control systems on-board Low Earth Orbit (LEO) microsatellites based on different reaction wheel configurations. Two configurations are presented, four reaction wheels configuration named tetrahedral configuration and classical three reaction wheels configuration. Three control algorithms,(More)
Information on battery problems can be useful in guiding research to improve battery technology. Problems that are serious or reoccur are the obvious ones to concentrate on. Observed problems can be caused by more than one phenomenon. However the problem that was observed on the Alsat-1 battery module where some cells were damaged, and the damage was caused(More)
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(More)
A communication satellites play a large role in the socio-economic development of a country, however the satellite communication system design trade-offs increase with the complexity of the payload requirements. For reliable and dynamic in-orbit satellite operations, the payload receiver must have the capability to adapt to emergent mission and post-mission(More)
Unscented Kalman filter (UKF) has been proven to be a superior alternative to the extended Kalman filter (EKF) when solving the nonlinear system in previous literatures. In order to explore the application of the UKF in the attitude estimation and control system (ADCS) on board low earth orbit (LEO) microsatellite, a comparison study is performed of the UKF(More)
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