Adaptive DFT-based fringe tracking and prediction at IOTA

Edward Wilson; Ettore Pedretti; Jesse Bregman; Robert W. Mah; Wesley Arthur Traub

doi:10.1117/12.552979

20 October 2004 Adaptive DFT-based fringe tracking and prediction at IOTA

Edward Wilson, Ettore Pedretti, Jesse Bregman, Robert W. Mah, Wesley Arthur Traub

Proceedings Volume 5491, New Frontiers in Stellar Interferometry; (2004) https://doi.org/10.1117/12.552979
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

An automatic fringe tracking system has been developed and implemented at the Infrared Optical Telescope Array (IOTA). In testing during May 2002, the system successfully minimized the optical path differences (OPDs) for all three baselines at IOTA. Based on sliding window discrete Fourier transform (DFT) calculations that were optimized for computational efficiency and robustness to atmospheric disturbances, the algorithm has also been tested extensively on off-line data. Implemented in ANSI C on the 266 MHz PowerPC processor running the VxWorks real-time operating system, the algorithm runs in approximately 2.0 milliseconds per scan (including all three interferograms), using the science camera and piezo scanners to measure and correct the OPDs. Preliminary analysis on an extension of this algorithm indicates a potential for predictive tracking, although at present, real-time implementation of this extension would require significantly more computational capacity.

Citation Download Citation

Edward Wilson, Ettore Pedretti, Jesse Bregman, Robert W. Mah, and Wesley Arthur Traub "Adaptive DFT-based fringe tracking and prediction at IOTA", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); https://doi.org/10.1117/12.552979

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KEYWORDS

Algorithm development

Detection and tracking algorithms

Data centers

Composites

Infrared telescopes

Convolution

Signal to noise ratio

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