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

## TL;DR

This paper demonstrates real-time radio frequency interference mitigation on the Parkes Telescope using a modified ASKAP phased array feed, achieving up to 20 dB suppression despite estimation errors.

## Contribution

It introduces a novel method for interpolating beamformer weights at interference-affected channels to improve RFI mitigation.

## Key findings

- Up to 20 dB interference suppression achieved.
- Effective removal of a stationary clock signal.
- Method for weight interpolation improves mitigation accuracy.

## Abstract

We present results from a first attempt to mitigate radio frequency interference in real-time during astronomical measurements with a phased array feed on the 64 m Parkes radio telescope. Suppression of up to 20 dB was achieved despite errors in estimating the interference spatial signature. Best results were achieved in the clean excision of a narrowband and stationary clock signal that originates from the receiver's digital back-end system. We also contribute a method to interpolate valid beamformer weights at interference-affected channels. Correct initial beam weights are required to avoid suppressing the desired signal.