Precision Attitude Control for the BETTII Balloon-Borne Interferometer

被引:2
作者
Benford, Dominic J. [1 ]
Fixsen, Dale J. [1 ]
Rinehart, Stephen A. [1 ]
Rizzo, Maxime J. [1 ]
Maher, Stephen F. [1 ]
Barry, Richard K. [1 ]
机构
[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
来源
GROUND-BASED AND AIRBORNE TELESCOPES IV | 2012年 / 8444卷
关键词
Precision Pointing; Balloon-borne telescope; Infrared interferometry; Attitude determination; Attitude control; TELESCOPE;
D O I
10.1117/12.927224
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is an 8-meter baseline far-infrared interferometer to fly on a high altitude balloon. Operating at wavelengths of 30-90 microns, BETTII will obtain spatial and spectral information on science targets at angular resolutions down to less than half an arcsecond, a capability unmatched by other far-infrared facilities. This requires attitude control of the gondola at the several arcsecond level, and phase correction of the gondola attitude at a level of less than a tenth of an arcsecond, great challenges for a lightweight balloon-borne system. We have designed a precision attitude determination system to provide gondola attitude knowledge at a level of 2 milliarcseconds at rates up to 100 Hz, with accurate absolute attitude determination at the half arcsecond level at rates of up to 10 Hz. A multi-stage control system involving rigid body motion and tip-tilt-piston correction provides precision pointing stability to the level required for the far-infrared instrument to perform its spatial/spectral interferometry in an open-loop control. We present key aspects of the design of the attitude determination and control and its development status.
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页数:11
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