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Proceedings Paper

Ground performance of the High-Energy Focusing Telescope (HEFT) attitude control system
Author(s): Kurt S. Gunderson; C. M. Hubert Chen; Finn Erland Christensen; William W. Craig; Todd A. Decker; Charles James Hailey; Fiona A. Harrison; Ryan McLean; Ronald E. Wurtz; Klaus Ziock
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Paper Abstract

The High Energy Focusing Telescope (HEFT) is a balloon-borne, hard x-ray/gamma ray (20-70 keV) astronomical experiment. HEFT's 10 arcminute field of view and 1 arcminute angular resolution place challenging demands on its attitude control system (ACS). A microprocessor-based ACS has been developed to manage target acquisition and sidereal tracking. The ACS consists of a variety of sensors and actuators, with provisions for 2-way ground communication, all controlled by an on-board computer. Ground based pointing performance measurements indicate 1σ jitter of 7" and gyro drift rates of <1" s-1. Jitter is expected to worsen in the flight environment, but star tracker data are expected to reduce drift rates significantly, enabling a predicted 1σ absolute attitude determination of ≥4.7". HEFT is scheduled for flight in Spring 2004.

Paper Details

Date Published: 3 February 2004
PDF: 11 pages
Proc. SPIE 5165, X-Ray and Gamma-Ray Instrumentation for Astronomy XIII, (3 February 2004); doi: 10.1117/12.513439
Show Author Affiliations
Kurt S. Gunderson, Lawrence Livermore National Lab. (United States)
C. M. Hubert Chen, California Institute of Technology (United States)
Finn Erland Christensen, Danish Space Research Institute (Denmark)
William W. Craig, Lawrence Livermore National Lab. (United States)
Todd A. Decker, Lawrence Livermore National Lab. (United States)
Charles James Hailey, Columbia Univ. (United States)
Fiona A. Harrison, California Institute of Technology (United States)
Ryan McLean, California Institute of Technology (United States)
Ronald E. Wurtz, Lawrence Livermore National Lab. (United States)
Klaus Ziock, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 5165:
X-Ray and Gamma-Ray Instrumentation for Astronomy XIII
Kathryn A. Flanagan; Oswald H. W. Siegmund, Editor(s)

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