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Robust RFI Excision for Pulsar Signals by a Novel Nonlinear M-type Estimator with an Application to Pulsar Timing

文献类型：期刊论文

作者Shan,Hao1,2
刊名The Astrophysical Journal
出版日期2023-07-01
卷号952期号:1页码:70
关键词frequency interference mitigation radio telescope regression transient representations removal noise
ISSN号0004-637X
DOI10.3847/1538-4357/acd170
产权排序1
英文摘要Abstract Radio frequency interference (RFI) mitigation for pulsar signals is a long perplexing issue in astrophysical measurements. Linear mitigation methods are often criticized for limited RFI excision range and weakness of RFI modeling. Meanwhile, thresholding methods (e.g., the SumThreshold) suffer from empirical factors. In our opinion, the main defect of the current status is the lack of a concise definition to distinguish signals from RFI with the aid of certain techniques, e.g., sparse representation. This point is the root cause of these problems and also forms our motivation. This paper aims to expand the excision range (e.g., the on-pulse and quasiperiodic RFI) and cut down some empirical factors. The main contribution is that we give a definition and derive a widely practicable nonlinear framework for RFI excision. This framework can overcome the susceptibility of the least-square criterion to RFI, and excise almost all types of RFI once and for all. A robust LnCosh criterion based nonlinear maximum likelihood-type (M-type) penalized smoothing estimator is introduced. The novelty is that this estimator is first embedded into the iterative shrinkage-thresholding algorithm (ISTA) and the fast ISTA. Nonlinearity highlights this method. Curvelet sparsity gives satisfying approximation for pulsar signals containing dispersion feature. Finally, useful signal details will be retrieved from the excision residual by a morphological component analysis. This method is applied to the time-frequency signals collected by the Nanshan 26 m Radio Telescope. The numerical experiments can persuasively prove that it has desired application prospects.
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:2023APJ...952...70S
出版者The American Astronomical Society
源URL[http://ir.xao.ac.cn/handle/45760611-7/6291]  
专题研究单元未命名
通讯作者Shan,Hao
作者单位1.Xinjiang Astronomical Observatory, Chinese Academy of Sciences 150, Science Street 1st, Urumqi 830011, People's Republic of China
2.Xinjiang Key Laboratory of Radio Astrophysics 150, Science Street 1st, Urumqi 830011, People's Republic of China
推荐引用方式
GB/T 7714		 Shan,Hao. Robust RFI Excision for Pulsar Signals by a Novel Nonlinear M-type Estimator with an Application to Pulsar Timing[J]. The Astrophysical Journal,2023,952(1):70.
APA Shan,Hao.(2023).Robust RFI Excision for Pulsar Signals by a Novel Nonlinear M-type Estimator with an Application to Pulsar Timing.The Astrophysical Journal,952(1),70.
MLA Shan,Hao."Robust RFI Excision for Pulsar Signals by a Novel Nonlinear M-type Estimator with an Application to Pulsar Timing".The Astrophysical Journal 952.1(2023):70.

入库方式： OAI收割

来源：新疆天文台

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