Computer Science – Performance
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ohio.rept.....i&link_type=abstract
Technical Report, Ohio Univ. Athens, OH United States Dept. of Electrical and Computer Engineering.
Computer Science
Performance
Controllers, Hubble Space Telescope, Line Of Sight, Mimo (Control Systems), Pointing Control Systems, Solar Arrays, Control Systems Design, Errors, Frequency Response, Functional Design Specifications, Stability, Temperature Effects, Vibration
Scientific paper
The Pointing Control System (PCS) onboard the Hubble Space Telescope (HST) is required to maintain line of sight pointing error less than 0.007 arc-seconds for observations lasting as long as 24 hours. Since deployment, an unanticipated disturbance source has resulted in line of sight jitter far exceeding this requirement. Detailed analysis has indicated that this disturbance is most likely due to thermally induced in-plane and out-of-plane flexing of the solar arrays (SA) at frequencies of roughly 0.6 Hz and 0.11 Hz, respectively. NASA efforts to redesign the HST PCS have led to significant, yet insufficient, pointing error attenuation 1. The purpose of this report is to detail efforts in applying Multi-Input, Multi-Output (MIMO) analysis and design techniques to the PCS redesign problem. In particular, the notion of singular value frequency response (i.e., H(infinity) specifications) is used extensively in formulating performance specifications and performing stability analyses for coupled MIMO systems such as the HST.
Follett Randolph F.
Frazier Garth W.
Glenn Russell D.
Irwin Dennis R.
Lawrence Douglas A.
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