Multi-baseline chain bootstrapping with new classic at the NPOI

A. M. Jorgensen; D. Mozurkewich; J. T. Armstrong; H. R. Schmitt; E. K. Baines; G. T. van Belle

doi:10.1117/12.2234389

4 August 2016 Multi-baseline chain bootstrapping with new classic at the NPOI

A. M. Jorgensen, D. Mozurkewich, J. T. Armstrong, H. R. Schmitt, E. K. Baines, G. T. van Belle

Proceedings Volume 9907, Optical and Infrared Interferometry and Imaging V; 99072C (2016) https://doi.org/10.1117/12.2234389
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

Imaging with optical interferometers requires fringe measurements on baseline long enough to resolve the target. These long baselines typically have low fringe contrast. Phasing them requires fringe tracking on shorter baselines which typically have greater fringe contrast and combining the fringe-tracking signals on the short baselines to phase the long baselines in a baseline bootstrapping configuration. On long resolving baselines coherent integration also becomes necessary in order to shorten the integration time. This paper addresses both the baseline bootstrapping and the coherent integration. The Navy Precision Optical Interferometer (NPOI) is laid out in a way which permits long-baseline phasing from shorter baselines in a multi-baseline scheme. The New Classic instrument for NPOI was designed specifically to implement the multi-baseline bootstrapping capability and multi-baseline observations can now be carried out routinely at the NPOI. This paper provides details about the bootstrapping scheme at NPOI and shows some initial results. We also discuss the bootstrapping error budget, describe our new Bayesian coherent integration algorithm and compare its performance to theory.

Citation Download Citation

A. M. Jorgensen, D. Mozurkewich, J. T. Armstrong, H. R. Schmitt, E. K. Baines, and G. T. van Belle "Multi-baseline chain bootstrapping with new classic at the NPOI", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99072C (4 August 2016); https://doi.org/10.1117/12.2234389

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