文章基本信息

标题：VOLKS2: A Transient Search and Localization Pipeline for VLBI Observations
本地全文：下载
作者：Lei Liu ; Zhijun Xu ; Zhen Yan 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2021
卷号：162
期号：4
页码：1-8
DOI：10.3847/1538-3881/ac1d44
语种：English
出版社：American Institute of Physics
摘要：We present VOLKS2, the second release of "VLBI Observation for transient Localization Keen Searcher." The pipeline aims at transient search in regular VLBI observations as well as detection of single pulses from known sources in dedicated VLBI observations. The underlying method takes the idea of geodetic VLBI data processing, including fringe fitting to maximize the signal power and geodetic VLBI solving for localization. By filtering the candidate signals with multiple windows within a baseline and by cross matching with multiple baselines, RFIs are eliminated effectively. Unlike the station autospectrum-based method, RFI flagging is not required in the VOLKS2 pipeline. EVN observation (EL060) is carried out, so as to verify the pipelines detection efficiency and localization accuracy in the whole FoV. The pipeline is parallelized with MPI and further accelerated with GPU, so as to exploit the hardware resources of modern GPU clusters. We can prove that, with proper optimization, VOLKS2 could achieve comparable performance as autospectrum-based pipelines. All the code and documents are publicly available, in the hope that our pipeline is useful for radio transient studies.