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Novel RFI Mitigation Methods in the Square Kilometre Array 1 Mid Correlator Beamformer

Journal
Date Issued
2019
Author(s)
Gunaratne, Thushara
•
Carlson, Brent
•
DOI
Abstract
The Square Kilometre Array (SKA) Phase 1 Mid Correlator Beamformer (Mid.CBF) adopts two novel methods to mitigate radio frequency interference (RFI) at the various stages of its signal chains. First, the pioneering Sample Clock Frequency Offset (SCFO) sampling suppresses interference which leaks into individual ‘Frequency-Slice’ (FS) (sub-bands) in the cross-correlations. Second, the ‘Shift-Resample-Shift-Back’ method minimizes the addition of noise due to strong clustered RFI. Empirical studies conducted with simulation of the systems confirm that the proposed methods significantly reduce the impact of RFI on the output of the radio telescope.
Volume
08
Issue
01
Start page
1940011
Uri
Url
Issn Identifier
2251-1725
Ads BibCode
2019JAI.....840011G
Rights
open.access
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