Abstract
Correlation algorithms for geodetic very long baseline interferometry (VLBI) can now be effectively implemented on parallel computers of modest size. We have undertaken a detailed comparison of the output from a trusted geodetic correlator, one that has supported global geodetic VLBI observations for many years, with the output of a software correlator implemented on a small parallel computing cluster. We show that the correlator outputs agree closely, within expected error bounds, after accounting for the differences in the adopted geometric delay models, and therefore that use of the software correlator is feasible for geodetic VLBI processing, as a first step toward routine geodetic data processing. Recent developments in software correlation for geodesy are discussed, including the possibility of real-time processing options.
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References
Alef W, Graham DA (2002) The New Bonn Mk IV – AIPS data export path. In: Ros E, Porcas RW, Lobanov AP, Zensus JA (eds) Proceedings of the 6th EVN symposium. MPifR, Bonn, pp 31–33
Deller AT, Tingay SJ, Bailes M, West C (2006) DiFX: a software correlator for very long baseline interferometry using multiprocessor computing environments. PASP 119: 318–336
Gordon D (2004) CALC: the next upgrade. In: Vandenberg NR, Baver KD (eds) International VLBI service for Geodesy and Astrometry 2004 general meeting proceedings. Ottawa, Canada, February 9–11, 2004. NASA/CP-2004-212255, pp 265–265
Gulyaev SA, Natusch TJ (2007) Collaboration and development of radio-astronomy in Australasia and the South-Pacific region: New Zealand perspectives. IAUSS 5: 137–140
Ma C et al (1998) The International Celestial Reference Frame as realized by very long baseline interferometry. AJ 116: 516–546
Phillips CJ et al (2007) Detection of compact radio emission from circinus X-1 with the first southern hemisphere e-VLBI experiment. MNRAS 380: L11–L14
Romney JD (1995) Theory of correlation in VLBI. In: Zensus JA, Diamond PJ, Napier PJ (eds) Very long baseline interferometry and the VLBA, Astronomical Society of the Pacific Conference Series, vol 82, pp 17–30
Sault RJ, Teuben PJ, Wright MCH (1995) A retrospective view of MIRIAD. In: Shaw RA, Payne HE, Hayes JJE (eds) Astronomical data analysis software and systems IV. PASP Conf Series 77:433–440
Schlüter W, Behrend D (2007) The international VLBI service for geodesy and astrometry (IVS): current capabilities and future prospects. J Geod 18(6–8): 379–387
Shapiro II (1976) Estimation of astrometric and geodetic parameters. Methods Exp Phys 12: 261–276
Thompson AR, Moran JM, Swenson GW (1986) Interferometry and synthesis in radio astronomy. Wiley-Interscience, NewYork
van Vleck JH, Middelton D (1966) The spectrum of clipped noise. Proc IEEE 54: 2–19
Whitney AR, Cappallo R, Aldrich W, Anderson B, Bos A, Casse J, Goodman J, Parsley S, Pogrebenko S, Schilizzi R, Smythe D (2004) Mark 4 VLBI correlator: architecture and algorithms. Radio Sci 39: 1007–1020
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Tingay, S.J., Alef, W., Graham, D. et al. Geodetic VLBI correlation in software. J Geod 83, 1061–1069 (2009). https://doi.org/10.1007/s00190-009-0324-3
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DOI: https://doi.org/10.1007/s00190-009-0324-3