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On-board correction of systematic error of Earth sensors

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2 Author(s)
T. K. Alex ; Indian Space Res. Organ. Satellite Center, Bangalore, India ; S. K. Shrivastava

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

Published in:

IEEE Transactions on Aerospace and Electronic Systems  (Volume:25 ,  Issue: 3 )