Accession Number : ADA408545


Title :   Design and Testing of Three-Axis Satellite Attitude Determination and Stabilization Systems That Are Based on Magnetic Sensing and Actuation


Descriptive Note : Final technical rept. 1 Jan 2001-31 Aug 2002


Corporate Author : CORNELL UNIV ITHACA NY


Personal Author(s) : Psiaki, Mark L ; Guelman, Moshe


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a408545.pdf


Report Date : 27 Nov 2002


Pagination or Media Count : 55


Abstract : Three-axis satellite attitude determination and active stabilization systems have been designed and tested using both flight experiments and simulation studies. These are being developed for use on low-Earth-orbiting name- satellites. Such satellites can be used as elements of constellations that implement synthetic aperture radar or that serve as nudes in a communications network. The research has addressed the problems of under-sensing and under-actuation that are present in magnetic-based systems. Magnetometer outputs are insensitive to rotation about the local Earth magnetic field, and magnetic torque coils cannot produce torque slump the field direction. A new attitude representation and a special globally-convergent extended Kalman filter have been used to solve the 3-axis attitude estimation problem. The efficacy of this system has been demonstrated using data from the missions, the Hubble Space Telescope and the Far-Ultraviolet Spectroscopic Explorer. Semi-active global 3-axis stabilization has been demonstrated using a simplified magnetometer output feedback control law in combination with weak passive stabilization of the axes. The passive stabilization can come from a very small momentum wheel or from a new aerodynamic system. The momentum-wheel-based concept has been successfully tested on the TechSat Gurwin II spacecraft.


Descriptors :   *ARTIFICIAL SATELLITES , *STABILIZATION SYSTEMS , *ATTITUDE(INCLINATION) , OUTPUT , FLIGHT TESTING , MAGNETIC FIELDS , SPACE SYSTEMS , PASSIVE SYSTEMS , SYNTHETIC APERTURE RADAR , COMMUNICATIONS NETWORKS , ROTATION , TORQUE , MOMENTUM , TELESCOPES , AERODYNAMICS , MAGNET COILS , MAGNETIC FORCES , MAGNETOMETERS


Subject Categories : Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE