Sky Noise Limited Snapshot Imaging in the Presence of RFI with Lofar's Initial Test Station

Details Sky Noise Limited Snapshot Imaging in the Presence of RFI with Lofar's Initial Test Station Sky Noise Limited Snapshot Imaging in the Presence of RFI with Lofar's Initial Test Station

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004exa....17...35w&link_type=abstract

Experimental Astronomy, Volume 17, Issue 1-3, pp. 35-42

Astronomy and Astrophysics

Astronomy

3

Clean, Lofar, Peeling, Phased Array, Rfi, Rfi Mitigation, Snapshot Imaging

Scientific paper

The initial test station (ITS) is the first full scale prototype of a low frequency array (LOFAR) station. It operates in the 10 40 MHz range and consists of 60 sky noise limited dipoles arranged in a five-armed spiral structure offering an instantaneous synthesized aperture of almost 200 m diameter. We will present all sky snapshot images demonstrating sky-noise limited imaging capability in the presence of a strong RFI source that exceeds the all sky power by 27 dB. This result is obtained with a two stage self-calibration procedure. First, the RFI source near the horizon is used as calibrator and then subtracted, after which Cas A shows up at a level that is a factor 2000 lower and then dominates the picture with its side lobes. A second self calibration on Cas A then reveals the same extended galactic emission as found in a RFI free adjacent spectral channel. This demonstrates that a single 10 kHz channel of a 6.7 s snapshot of a single LOFAR station already provides a dynamic range of over 104.

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