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

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

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000opten..39.1665m&link_type=abstract

Optical Engineering 39(06), 1665-1676, Roger A. Lessard; Ed.

Physics

Optics

1

Scientific paper

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.

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