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• W4367172562 abstract "Abstract In the neutral hydrogen (H i ) galaxy survey, a significant challenge is to identify and extract the H i galaxy signal from the observational data contaminated by radio frequency interference (RFI). For a drift-scan survey, or more generally a survey of a spatially continuous region, in the time-ordered spectral data, the H i galaxies and RFI all appear as regions that extend an area in the time-frequency waterfall plot, so the extraction of the H i galaxies and RFI from such data can be regarded as an image segmentation problem, and machine-learning methods can be applied to solve such problems. In this study, we develop a method to effectively detect and extract signals of H i galaxies based on a Mask R-CNN network combined with the PointRend method. By simulating FAST-observed galaxy signals and potential RFI impact, we created a realistic data set for the training and testing of our neural network. We compared five different architectures and selected the best-performing one. This architecture successfully performs instance segmentation of H i galaxy signals in the RFI-contaminated time-ordered data, achieving a precision of 98.64% and a recall of 93.59%." @default.
• W4367172562 created "2023-04-28" @default.
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• W4367172562 date "2023-10-04" @default.
• W4367172562 modified "2023-10-06" @default.
• W4367172562 title "Detecting HI Galaxies with Deep Neural Networks in the Presence of Radio Frequency Interference" @default.
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• W4367172562 doi "https://doi.org/10.1088/1674-4527/acd0ed" @default.
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