NDLI: Advanced fringe tracking algorithms for low-light level ground-based stellar interferometry

Content Provider	IEEE Xplore Digital Library
Author	Padilla, C.E. Karlov, V.I. Matson, L. Chun, H.M.
Copyright Year	1998
Description	Author affiliation: Moldyn Inc., Cambridge, MA, USA (Padilla, C.E.)
Abstract	Advanced nonlinear fringe tracking algorithms are used to improve the state-of-the-art in ground-based optical stellar interferometric fringe tracking by allowing the tracking of stars one to two bolometric magnitudes dimmer than currently possible. Even more significantly, the authors demonstrate active fringe locking for dim stars with less than 10% loss of lock probability. Enabling fringe locking through the atmosphere for dim stars has significant implications for ground-based interferometric stellar imaging. These results are a consequence of the powerful estimation framework in which the discrete Bayesian algorithm (DBA) is developed. This framework makes it possible to incorporate all the available nonlinear model and statistical information, including the known statistics of atmospheric variations, into the tracking algorithm and thus results in the highest performing fringe tracker. The authors made use of Zernike polynomial representations in order both to simulate atmospheric variations for algorithm evaluation and comparison, and also to incorporate the atmospheric information into the statistical mechanism of the nonlinear filters developed. All simulations are performed using parameters for the CHARA Array of Georgia State University. The formulation of the DBA for ground-based fringe tracking is presented. The nature of the data structures in the DBA makes it especially well suited to the incorporation of experimental data. A detailed formulation and preliminary evaluation is carried out on the Variation-Invariant Subspace Tracking Algorithm (VISTA). VISTA offers the possibility of making the interferometric measurements invariant to atmospheric disturbances through the optimal projection of many "sub-aperture interferometers" onto one invariant subspace. The DBA can fringe lock dim stars with a 50% loss of lock probability where state-of-the-art fringe tracking techniques fail. The use of VISTA in the fringe locking regime resulted in an improvement on the DBA results by up to one bolometric magnitude dimmer stars.
Starting Page	1585
Ending Page	1589
File Size	557548
Page Count	5
File Format	PDF
ISBN	0780345304
ISSN	07431619
DOI	10.1109/ACC.1998.707273
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-06-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Atmospheric modeling Optical interferometry Nonlinear optics Optical filters Optical losses Probability Atmosphere Optical imaging Bayesian methods Statistics
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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