GRIDflag : A UV Plane Flagging Algorithm for High Fidelity Interferometric Imaging

We present a UV-plane based flagging algorithm called GRIDflag that enables sensitive radio frequency interferemce (RFI) flagging, and hence high fidelity imaging, in the presence of strong, persistent RFI in radio interferometric observations. RFI is becoming increasingly common, particularly for observations in the 100 MHz - 10 GHz range, due to the proliferation of new communication technologies and satellites, as well as emitters such as power lines, electric motors etc.