How Do VLBI Correlators Work?

Details How Do VLBI Correlators Work? How Do VLBI Correlators Work?

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ivsg.conf..187w&link_type=abstract

International VLBI Service for Geodesy and Astrometry 2000 General Meeting Proceedings, edited by Nancy R. Vandenberg and Karen

Astronomy and Astrophysics

Astronomy

Scientific paper

The VLBI correlator is the “glue” that brings the data from separate antennas together and processes it to form the basic observables used in astronomy and geodesy. In this introductory tutorial, we will examine the operations that the correlator executes by following through a set of simple examples from raw data to multi-band delay estimates. What we will find is that the operations performed inside a correlator are really quite simple and understandable. What is not so simple are the practical realities of dealing with tapes, the precise control of huge torrents of data from tape, and the complicated bookkeeping to keep track of everything. Four our purposes, however, we will completely ignore these difficulties and examine the correlator as a simple machine.

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