Post-Correlation RFI Excision with the VLA and the EVLA
R. Perley, National Radio Astronomy Observatory
T. Cornwell, National Radio Astronomy Observatory
S. Bhatnagar, National Radio Astronomy Observatory
K. Golap, National Radio Astronomy Observatory
To a synthesis interferometer, a source of RFI differs from a distant unresolved astronomical source primarily in its rapid differential phase rate. Providing that the correlator sampling is sufficiently rapid, and that the RFI emissions do not drive the signal transmission or processing components to non-linear behavior, the well-established methods of self-calibration and source subtraction which are commonly employed to remove the responses from unwanted astronomical sources should be applicable to sources of RFI. We will discuss the applicability of this approach to RFI excisions,and give examples of its effectiveness on data taken with the VLA.