摘要
The radio telescope possesses high sensitivity and strong signal collection capabilities.While receiving celestial radiation signals,it also captures Radio Frequency Interferences(RFIs)introduced by human activities.RFI,as signals originating from sources other than the astronomical targets,significantly impacts the quality of astronomical data.This paper presents an RFI fast mitigation algorithm based on block Least Mean Square(LMS)algorithm.It enhances the traditional adaptive LMS filter by grouping L adjacent time-sampled points into one block and applying the same filter coefficients for filtering within each block.This transformation reduces multiplication calculations and enhances algorithm efficiency by leveraging the time-domain convolution theorem.The algorithm is tested using baseband data from the Parkes 64 m radio telescope's pulsar observations and simulated data.The results confirm the algorithm's effectiveness,as the pulsar profile after RFI mitigation closely matches the original pulsar profile.
基金
supported by the National Key R&D Program of China(Nos.2021YFC2203502 and 2022YFF0711502)
the National Natural Science Foundation of China(NSFC)(12173077 and 12073067)
the Tianshan Innovation Team Plan of Xinjiang Uygur Autonomous Region(2022D14020)
the Tianshan Talent Project of Xinjiang Uygur Autonomous Region(2022TSYCCX0095)
the Scientific Instrument Developing Project of the Chinese Academy of Sciences(grant No.PTYQ2022YZZD01)
China National Astronomical Data Center(NADC)
the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments,budgeted from the Ministry of Finance of China(MOF)and administrated by the Chinese Academy of Sciences(CAS)
Natural Science Foundation of Xinjiang Uygur AutonomousRegion(2022D01A360)
the CAS“Light of West China”program under No.2022-XBQNXZ-012
supported by Astronomical Big Data Joint Research Center,cofounded by National Astronomical Observatories,Chinese Academy of Sciences。
