Arcetri Technical Report 4/2014

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SKA Project Series
Structure and processing of the F section for SKA

G. Comoretto

INAF Osservatorio Astrofisico di Arcetri

Abstract

The three (Low, Mid and Survey) SKA correlators share a similar structure, with a FX architecture. The F part has a total of the order of 2 18 channels, with a dual stage filter-bank. The first stage provides channelization with overlapping channels, while the second provides non overlapping channels with good channel-to-channel insulation.

The channelization parameters (filter shape vs. filter complexity, overlapping amount, etc) are similar for the correlators, despite important differences in bandwidth, physical implementation, etc. We discuss these parameters, with considerations on the specificity of the three correlators.

The delay and fringe compensation functions are also implemented inside the channelizer, and are discussed here.

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