Interference Mitigation with a Modified ASKAP Phased Array Feed on the 64 m Parkes Radio Telescope

摘要

We present results from a first attempt to mitigate radio frequencyinterference in real-time during astronomical measurements with a phased arrayfeed on the 64 m Parkes radio telescope. Suppression of up to 20 dB wasachieved despite errors in estimating the interference spatial signature. Bestresults were achieved in the clean excision of a narrowband and stationaryclock signal that originates from the receiver's digital back-end system. Wealso contribute a method to interpolate valid beamformer weights atinterference-affected channels. Correct initial beam weights are required toavoid suppressing the desired signal.