22–25 Mar 2010
University of Manchester
Europe/London timezone
SKA 2010 Science and Engineering meeting

LOFAR offline interference detection

24 Mar 2010, 17:05
15m
Whitworth Hall (University of Manchester)

Whitworth Hall

University of Manchester

Oxford street Manchester M139PL
Signal Transport, Signal Processing, Software, and Data Management Signal Transport, Signal Processing, Software, & Data Management

Speaker

Mr André Offringa (Kapteyn Astronomical Institute)

Description

The LOFAR telescope embeds various techniques to deal with radio frequency interference (RFI). One of these techniques is a completely automated post-correlation flagger. For this purpose, several post-correlation classification methods for efficient detection and flagging of RFI have been designed and compared. Currently, the selected flagging strategy is the “SumThreshold” method, which consists of an iterative surface fit in the time frequency plane and a new combinatorial thresholding technique. Several tweaks can enhance speed, quality and purpose, for example, to allow pulsar data to be flagged. Scaling various RFI flagging methods, such as flagging on auto instead of cross-correlations, to the large number of stations projected for the SKA, requires some further thoughts. Some ideas about this will be presented.

Primary author

Mr André Offringa (Kapteyn Astronomical Institute)

Co-authors

Prof. Ger de Bruyn (Astron & Kapteyn Astronomical Institute Groningen) Dr Michael Biehl (Institute for Mathematics and Computing Science, University of Groningen) Prof. Saleem Zaroubi (Kapteyn Astronomical Institute Groningen)

Presentation materials