Home » Attitude Model of a Reaction Wheel/Fixed Thruster Based Satellite Using Telemetry Data by Jason E. Smith
Attitude Model of a Reaction Wheel/Fixed Thruster Based Satellite Using Telemetry Data Jason E. Smith

Attitude Model of a Reaction Wheel/Fixed Thruster Based Satellite Using Telemetry Data

Jason E. Smith

Published October 9th 2012
ISBN : 9781249594130
Paperback
142 pages
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 About the Book 

Attitude determination of satellites is normally the job of inertial instruments, such as gyroscopes, or through sensing instruments, such as star trackers orGlobal Positioning Satellites (GPS). Satellite health monitoring systems watch and determineMoreAttitude determination of satellites is normally the job of inertial instruments, such as gyroscopes, or through sensing instruments, such as star trackers orGlobal Positioning Satellites (GPS). Satellite health monitoring systems watch and determine if the satellite deviates from its normal operating attitudeorientation. Knowing the orientation of a satellite is essential in being able to control it in order to complete the satellites designated mission. While there area multitude of ways to determine a satellites orientation, very little research has been done on determining if the attitude of a satellite can be determineddirectly from telemetry data of the attitude control systems and an accurate spacecraft model. The fidelity of a satellite attitude determination model requiredto get reasonable predictions from using only telemetry data of the attitude controllers, such as thruster on/off indicators and reaction wheel rotor speeds, isinvestigated. Experimental tests using telemetry data received from the Air Force Institute of Technologys (AFIT) Simulated Satellite, SimSat, is used inverifying a Matlab model which outputs SimSats orientation from SimSats reaction wheel and thruster telemetry data. Software modeling results showed thatit is possible to determine a satellites attitude from only the attitude controllers telemetry data when the satellites dynamic model is known.