NDLI: Distributed metrology and active control for according stabilization of space telescopes

Content Provider	IEEE Xplore Digital Library
Author	Canuto, E.S. Musso, F.
Copyright Year	2004
Description	Author affiliation: Dipt. di Autom. e Informatica, Politecnico di Torino, Italy (Canuto, E.S.; Musso, F.)
Abstract	The paper is concerned with the active angular stabilization of the astrometric instrument of the scientific satellite GAIA (Global Astrometric Interferometer for Astrophysics). The ESA satellite, being an evolution of the HIPPARCOS mission, aims to provide a precise astrometric map of the Galaxy. The main mission requirement is the time stability of the basic angle between the line-of-sights of the two on-board telescopes. The residual angular perturbation shall be less than few picoradian. Only laser interferometric technology, and specifically active Fabry-Perot (FP) interferometry, is expected to favour such a requirement. The paper first mentions two alternative stabilization strategies, passive and active. Then it focuses to the active one, which is under development by a team led by Alenia Spazio, Italy. Active stabilization, operating in closed-loop, needs appropriate instruments to measure the basic angle variations and actuators to force them to zero. The former ones are provided by one-meter length FP interferometers locked to a frequency-stable laser beam and capable of picometer precision, the latter by piezo-electric translators. A complex digital control unit manages a set of 12 interferometers in addition to laser frequency and basic angle stabilization.
Sponsorship	IEEE Control Syst. Soc
Starting Page	316
Ending Page	321
File Size	414834
Page Count	6
File Format	PDF
ISBN	0780386353
ISSN	21589860
DOI	10.1109/ISIC.2004.1387702
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-04
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Metrology Telescopes Instruments Satellites Force measurement Frequency Astrophysics Stability Space technology Fabry-Perot
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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