Computer Science – Performance
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995fmet.symp..115b&link_type=abstract
In NASA. Goddard Space Flight Center, Flight Mechanics/Estimation Theory Symposium 1995 p 115-126 (SEE N95-27763 09-13)
Computer Science
Performance
Calibrating, Computer Systems Performance, Hubble Space Telescope, Magnetic Moments, Magnetometers, Orbit Calculation, Orbital Position Estimation, Position Errors, Space Shuttle Missions, Torquers, Algorithms, Alignment, Data Acquisition, Geocentric Coordinates, Parameter Identification, Position (Location), Satellite Orientation, Telemetry
Scientific paper
The two magnetometers recently replaced on the Hubble Space Telescope during the STS-61 Servicing Mission are now being used successfully for Coarse Attitude Determination during spacecraft vehicle safemode recovery operation. The magnetometer alignments relative to the spacecraft's vehicle's reference frame and the magnetic coupling of the sensors to the four magnetic torquer bars were determined. Coarse Attitude determination errors are now reduced to an average of 0.6 deg. Magnetometer Sensing System calibration and Coarse Attitude determination testing with the new calibration parameters is a geometrical problem. Telemetered earth magnetic field data was collected at twenty-six different vehicle attitudes. The spacecraft attitudes selected were distributed as widely apart as possible throughout the Geocentric Inertial Coordinate reference frame. It is also desirable to sample the Earth's magnetic field over as many different locations of the spacecraft's passage over the Earth as possible, within the limitation of the +/- 28.5 deg orbital inclination. A full range of magnetic moment outputs from the torquer bars needs to be sampled, +/- 3600 ampmeters squared, as well as data when the torquer bars have zero current. Graphic utilities were also developed to visually aid in optimizing the data collection process. Finally, a brief discussion of a method for collecting data for future calibrations is suggested.
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