Multi-baseline chain bootstrapping with new classic at the NPOI
| Autor: | J. T. Armstrong, G. T. van Belle, H. R. Schmitt, D. Mozurkewich, Anders M. Jorgensen, Ellyn K. Baines |
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| Rok vydání: | 2016 |
| Předmět: |
Time delay and integration
Computer science business.industry Bootstrapping (linguistics) Navy Precision Optical Interferometer 01 natural sciences Phaser 010309 optics Interferometry Optics 0103 physical sciences Astronomical interferometer business Baseline (configuration management) 010303 astronomy & astrophysics Algorithm |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2234389 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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