Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-28
Astronomy and Astrophysics
Astrophysics
12 pages, 7 figures; Invited talk given at IVS Symposium in Korea -- New Technologies in VLBI, Korea, Nov 2002; to appear in t
Scientific paper
Radio interferometric observations are less susceptible to radio frequency interference (RFI) than single dish observations. This is primarily due to : (1)fringe-frequency averaging at the correlator output and (2) bandwidth decorrelation of broadband RFI. Here, we propose a new technique to improve RFI suppression of interferometers by replacing the fringe-frequency averaging process with a different filtering process. In the digital implementation of the correlator, such a filter should have cutoff frequencies $< 10^{-6}$ times the frequency at which the baseband signals are sampled. We show that filters with such cutoff frequencies and attenuation $>$ 40 dB at frequencies above the cutoff frequency can be realized using multirate filtering techniques. Simulation of a two element interferometer system with correlator using multirate filters shows that the RFI suppression at the output of the correlator can be improved by 40 dB or more compared to correlators using a simple averaging process.
Anish Roshi D.
Perley Richard A.
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