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arXiv 2007.14996astro-ph.IMcs.LG
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用于RFI标记的监督神经网络

Supervised Neural Networks for RFI Flagging

University of Cape Town(开普敦大学)

Kyle Harrison, Amit Kumar Mishra

摘要:

将基于神经网络的方法应用于后相关、后校准时间/频率数据中的射频干扰(RFI)检测。虽然校准不影响RFI为了这项工作,减少数据集后校准使用。使用现有的RFI标记技术AOFlagger作为基础事实,展示了两种用于标记真实测量数据的机器学习方法。结果表明,以各极化的幅值、相位和斯托克斯速度为特征,利用各时频样本可以训练出单层全连接网络。该方法能够预测每个基线的布尔标志图,达到高度的准确性,召回率为0.69,精度为0.83,F1分数为0.75。

英文摘要:

Neural network (NN) based methods are applied to the detection of radio frequency interference (RFI) in post-correlation,post-calibration time/frequency data. While calibration doesaffect RFI for the sake of this work a reduced dataset inpost-calibration is used. Two machine learning approachesfor flagging real measurement data are demonstrated usingthe existing RFI flagging technique AOFlagger as a groundtruth. It is shown that a single layer fully connects networkcan be trained using each time/frequency sample individuallywith the magnitude and phase of each polarization and Stokesvisibilities as features. This method was able to predict aBoolean flag map for each baseline to a high degree of accuracy achieving a Recall of 0.69 and Precision of 0.83 and anF1-Score of 0.75.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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