Title :
On-board correction of systematic error of Earth sensors
Author :
Alex, T.K. ; Shrivastava, S.K.
Author_Institution :
Indian Space Res. Organ. Satellite Center, Bangalore, India
fDate :
5/1/1989 12:00:00 AM
Abstract :
Infrared Earth sensors are used in spacecraft for attitude sensing. Their accuracy is limited by systematic and random errors. Dominant sources of systematic errors are analyzed for a typical scanning infrared Earth sensor used in a remote-sensing satellite in a 900-km Sun-synchronous orbit. The errors considered arise from seasonable variation of infrared radiation; oblate shape of the Earth; ambient temperature of sensors; changes in spin/scan period; and misalignment of the axis of the sensors. Simple relations are derived using least-squares curve fitting for onboard correction of these errors. With these, it is possible to improve the accuracy of attitude determination by eight fold and achieve performance comparable to ground-based post-facto attitude computation
Keywords :
aerospace computing; aerospace instrumentation; artificial satellites; attitude control; digital simulation; infrared detectors; least squares approximations; measurement errors; remote sensing; 900×103 micron; 900-km Sun-synchronous orbit; aerospace instrumentation; ambient temperature; attitude sensing; digital simulation; least-squares curve fitting; misalignment; oblate shape; onboard correction; pitch angle; remote-sensing satellite; roll angle; scanning infrared Earth sensor; seasonable variation; spin/scan period; systematic errors; Earth; Error analysis; Error correction; Infrared sensors; Position measurement; Remote sensing; Satellites; Sensor systems; Space vehicles; Temperature sensors;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
