Online fringe tracking and prediction at IOTA

Details Online fringe tracking and prediction at IOTA Online fringe tracking and prediction at IOTA

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3749..691w&link_type=abstract

Proc. SPIE Vol. 3749, p. 691-692, 18th Congress of the International Commission for Optics, Alexander J. Glass; Joseph W. Goodma

Physics

Optics

Scientific paper

The Infrared/Optical Telescope Array (IOTA) is a multi- aperture Michelson interferometer located on Mt. Hopkins near Tucson, Arizona. To enable viewing of fainter targets, an on-line fringe tracking system is presently under development at NASA Ames Research Center. The system has been developed off-line using actual data from IOTA, and is presently undergoing on-line implementation at IOTA. The system has two parts: (1) a fringe tracking system that identifies the center of a fringe packet by fitting a parametric model to the data; and (2) a fringe packet motion prediction system that uses characteristics of past fringe packets to predict fringe packet motion. Combined, this information will be used to optimize on-line the scanning trajectory, resulting in improved visibility of faint targets. Fringe packet identification is highly accurate and robust (99% of the 4000 fringe packets were identified correctly, the remaining 1D were either out of the scan range or too noisy to be seen) and is performed in 30 - 90 milliseconds (depending on desired accuracy) on a Pentium II-based computer. Fringe packet prediction, currently performed using an adaptive linear predictor, delivers a 10% improvement over the baseline of predicting no motion.

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