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As radio telescopes become sensitive, radio frequency interference (RFI) ismore and more serious for interesting signals of radio astronomy. There existdemands for developing an automatic, accurate and efficient RFI mitigationmethod. Therefore, this work investigated the RFI detection algorithm. Firstly,we introduced an Asymmetrically Reweighted Penalized Least Squares (ArPLS)method to estimate baseline more accurately. After removing the estimatedbaseline, several novel strategies were proposed based on the SumThresholdalgorithm for detecting different types of RFI. The threshold parameter in theSumThreshold can be determined automatically and adaptively. The adaptivenessis essential for reducing human interventions and the online RFI processingpipeline. Applications to FAST (Five-hundred-meter Aperture SphericalTelescope) data show that the proposed scheme based on the ArPLS andSumThreshold is superior to some typically available methods for RFI detectionwith respect to efficiency and performance.

Radio Frequency Interference Mitigation based on the ArPLS and SumThreshold Method