Computer Science – Performance
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1111...44g&link_type=abstract
IN: Acquisition, tracking, and pointing III; Proceedings of the Meeting, Orlando, FL, Mar. 27-29, 1989 (A90-39001 17-17). Bellin
Computer Science
Performance
Mirrors, Performance Tests, Pointing Control Systems, Space Infrared Telescope Facility, Control Stability, Control Systems Design, Cryogenic Equipment, Infrared Telescopes, Servocontrol
Scientific paper
The Space Infrared Telescope Facility (SIRTF), a NASA 'Great Observatory' to be launched in the late 1990s, is a superfluid helium-cooled one meter class IR telescope with a sophisticated chopping facility provided by a dynamic two-axis tilt control capability of the secondary mirror. This paper describes the pointing performance analysis of the Prototype Secondary Mirror Assembly (PSMA) design. The two-axis PSMA tilt control system employs four linear actuators and four pairs of position eddy current sensors, and a reaction mass system to isolate the servo loops from the structural modes. The actuators and sensors operate in the 4 K environment of the secondary mirror assembly, while the control electronics reside in the 'warm' electronics box outside the dewar. The PSMA design meets stringent pointing performance requirements over a range of discrete chop amplitudes and frequencies, for three different dynamic chop modes. The analysis of the pointing performance utilizes a detailed dynamic model of the PSMA in time and frequency domains, including the discretization and quantization effects in the servo-controllers, the sensor noise, and the structural modes. The servo stability issues are also addressed.
Duffy Michael A.
Gullapalli Sarma N.
Rockwell Richard A.
Sileo Francis R.
Stier Mark T.
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