An attitude and orbit determination and control system for a small geostationary satellite
Date
2006-12
Authors
Thopil, G. A.
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : University of Stellenbosch
Abstract
An analysis of the attitude determination and control system required for a
small geostationary satellite is performed in this thesis. A three axis quaternion
feedback reaction wheel control system is the primary control system used to meet the
stringent accuracy requirements. A momentum bias controller is also evaluated to
provide redundancy and to extend actuator life.
Momentum dumping is preformed by magnetic torque rods using a crossproduct
controller. Performance of three axis thruster control is also evaluated. A full
state Extended Kalman filter is used to determine attitude and body angular rates
during normal operation whereas a Multiplicative Extended Kalman Filter is used
during attitude manoeuvres.
An analytical orbit control study is also performed to calculate the propellant
required to perform station-keeping, for a specific sub-satellite location over a ten
year period. Finally an investigation on the effects caused by thruster misalignment,
on satellite attitude is also performed.
Description
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
Keywords
Geostationary satellites, Orbit control, Attitude determination and control system, Dissertations -- Electronic engineering, Theses -- Electronic engineering