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Pointing Control System Design and Performance Evaluation for TPF CoronagraphThe Terrestrial Planet Finder (TPF) program aims to detect and characterize extra-solar Earth-like planets. The coronagraph telescope is one of the four mission concepts being studied. In order to reject the star flux and detect the planet flux in the visible light range, the coronagraph telescope must achieve a rejection ratio on the order of a billion to one. Dynamic jitter, introduced by environmental and on-board mechanical disturbances, degrades the optical performance, as characterized primarily by contrast ratio. The feasibility of using passive vibration isolation combined with active attitude and line-of- sight control systems to stabilize the spacecraft and the optical components to the requisite level is being studied. The telescope is also required to slew between targets. The slew mode control law must be designed to balance the need for efficient large-angle maneuvers while simultaneously avoiding the excitation of flexible modes in order to minimize settling time.
Document ID
20040030478
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Liu, Kuo-Chia
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Blaurock, Carl
(Mide Technology Corp.)
Mosier, Gary
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Lunar And Planetary Science And Exploration
Meeting Information
Meeting: Astronomical Telescopes and Instrumentation 2004
Location: Glasgow, Scotland
Country: United Kingdom
Start Date: June 21, 2004
End Date: June 25, 2004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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