Radio-Frequency Interference

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The radio spectrum is used by many non-astronomers, so techniques for dealing with radio-frequency interference (RFI) are very important for conducting successful observations, especially at low frequencies.

A brief discussion of RFI characteristics and basic excision techniques from the 2010 summer school can be found here: PDF of lecture slides

Planning observations around RFI

The NRAO maintains a database of known RFI lines, available as both lists and spectra : RFI which can be used to select RFI-free spectral windows when planning the correlator setup for your observations.

Recognizing RFI

Flagging RFI