Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jspro..32..344p&link_type=abstract
Journal of Spacecraft and Rockets (ISSN 0022-4650), vol. 32, no. 2, p. 344-352
Astronomy and Astrophysics
Astrophysics
Control Systems Design, Grazing Incidence, Imaging Spectrometers, Pointing Control Systems, Space Probes, Spaceborne Astronomy, Spacecraft Control, X Ray Astrophysics Facility, Astronomical Spectroscopy, Computerized Simulation, Radiation Detectors, Spacecraft Guidance, System Identification, Systems Stability, X Ray Imagery, X Ray Spectroscopy
Scientific paper
The Advanced X-Ray Astrophysics Facility Spectrometry is an orbiting astronomical observatory using grazing-incidence optics to focus x-ray images on a liquid-helium-cooled imaging x-ray spectrometer (XRS). It will be launched on a Delta-2 launch vehicle into a 650-km, circular, sun-synchronous orbit and will be operated as a national observatory for an expected period of 5 years. This paper describes the conceptual design of the pointing control system (PCS), whose function is to acquire x-ray targets on the XRS detector and maintain a pointing stability of 5.5 seconds (rms) per axis over any 10-min period that excludes a day-night or night-day terminator crossing. The proposed PCS design attempts to use the best features of previous PCS designs, but has several new features not found on other spacecraft. Hence, it can serve as a good starting point and reference for PCS designers of future spacecraft. Error budgets and preliminary simulation results show the soundness of the design approach.
Calhoun Philip C.
Lightsey William D.
Nurre Gerald S.
Polites Michael E.
Sharkey John P.
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