We also use the clustering algorithms to remove more RFI and select candidates. We detect the persistent narrowband RFI by setting a threshold of the signals' sky separation and detect the drifting RFI (and potentially other types of RFI) using the Hough transform. In this paper, we propose several new techniques for RFI mitigation and use our procedure to search for ETI signals from the archival data of FAST's first SETI commensal survey. The mitigation of radio frequency interference (RFI) is an important step, especially for the most sensitive Five-hundred-meter Aperture Spherical radio Telescope (FAST), which can detect more weak RFI. The search for extraterrestrial intelligence (SETI) commensal surveys aim to scan the sky to find possible technosignatures from an extraterrestrial intelligence (ETI). National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of ChinaĬollege of Command and Control Engineering, Army Engineering University, Nanjing 210017, People's Republic of China Listen, University of California Berkeley, Berkeley, CA 94720, USA Sciences Laboratory, University of California Berkeley, Berkeley, CA 94720, USA Institute for Astronomical Science, Dezhou University, Dezhou 253023, People's Republic of China Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, People's Republic of China Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of Chinaĭepartment of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of Chinaĭepartment of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China
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