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Origins Testbed: capturing the dynamics and control of future space-based telescopes

Origins Testbed: capturing the dynamics and control of future space-based telescopes We describe a laboratory test article developed to capture the dynamics and control problems anticipated for future space-based telescopes: the Space Interferometry Mission (SIM) and the Next Generation Space Telescopes (NGST). We motivate the design of the Origins Testbed (OT) by identifying three operational events common to space-based telescopes and requiring the OT to simulate them in a laboratory: large-angle slew, optical capture (alignment), and observation. The OT is the first spacecraft-like testbed to include nanometer phasing and a large-angle slew capability in the presence of spacecraftlike disturbances. The OT is discussed in detail, including the testbed’s dynamics and control sensors and actuators, with particular emphasis on the optical system. We present the necessary optics to capture the phasing of SIM and NGST using three interferometer channels. Pointing optics are detailed, with a description of an implemented spiral-based autoalignment algorithm. Initial slew control is discussed, and experimental results are presented. Future experiments performed on the OT will provide critical heritage for control techniques to be implemented on SIM and NGST. © 2000 Society of Photo-Optical Instrumentation Engineers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Optical Engineering SPIE

Origins Testbed: capturing the dynamics and control of future space-based telescopes

Optical Engineering , Volume 39 (6) – Jun 1, 2000

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References (9)

Publisher
SPIE
Copyright
Copyright © 2000 Society of Photo-Optical Instrumentation Engineers
ISSN
0091-3286
eISSN
1560-2303
DOI
10.1117/1.602544
Publisher site
See Article on Publisher Site

Abstract

We describe a laboratory test article developed to capture the dynamics and control problems anticipated for future space-based telescopes: the Space Interferometry Mission (SIM) and the Next Generation Space Telescopes (NGST). We motivate the design of the Origins Testbed (OT) by identifying three operational events common to space-based telescopes and requiring the OT to simulate them in a laboratory: large-angle slew, optical capture (alignment), and observation. The OT is the first spacecraft-like testbed to include nanometer phasing and a large-angle slew capability in the presence of spacecraftlike disturbances. The OT is discussed in detail, including the testbed’s dynamics and control sensors and actuators, with particular emphasis on the optical system. We present the necessary optics to capture the phasing of SIM and NGST using three interferometer channels. Pointing optics are detailed, with a description of an implemented spiral-based autoalignment algorithm. Initial slew control is discussed, and experimental results are presented. Future experiments performed on the OT will provide critical heritage for control techniques to be implemented on SIM and NGST. © 2000 Society of Photo-Optical Instrumentation Engineers.

Journal

Optical EngineeringSPIE

Published: Jun 1, 2000

Keywords: space-based telescopes; flexible structure test article; SIM; NGST; flexible space structures; pointing; phasing; spacecraft control; ground-based testbed

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