Automatic magnetic control of a momentum-biased observatory in equatorial orbit

Details Automatic magnetic control of a momentum-biased observatory in equatorial orbit Automatic magnetic control of a momentum-biased observatory in equatorial orbit

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976stin...7712098s&link_type=abstract

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Astronomical Observatories, Equatorial Orbits, Magnetic Control, Electromagnets, Magnetometers, Momentum Transfer, Pointing Control Systems

Scientific paper

An equatorial astronomical observatory is stabilized by electromagnets and a single axial momentum wheel. Pointing and wheel speed errors combined with magnetometer outputs drive the magnets. Proportional laws and momentum dumping laws (gains quadratically weighted using magnetometer outputs) are compared. A new open-loop law uses the magnetometer alone to generate efficient slews and wheel dumps. Modified three axis dumping laws provide sub-degree pointing. Simple proportional laws provide arc minute pointing with occasional wheel dump interruptions and possible pointing excursions of a few arc minutes. The new proportional approach offers momentum control advantages for this and other missions.

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