Processing system for coherent dedispersion of pulsar radio emission

IF 1.9 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Astronomy and Computing Pub Date : 2023-10-01 DOI:10.1016/j.ascom.2023.100754

I.A. Girin, S.F. Likhachev, A.S. Andrianov, M.S. Burgin, M.V. Popov, A.G. Rudnitskiy, V.A. Soglasnov, V.A. Zuga

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Abstract

Our study provides pulsar researchers with the possibility to utilize VLBI data for looking at pulsar radio emission with the extreme time resolution typical for broad band VLBI recorders. Pulsars emit micropulses and giant pulses shorter than a microsecond. The short pulse durations indicate high brightness temperatures. This constrains the physical nature of the pulsar radio emission mechanism, whose theory is not yet completely understood.

Our paper describes a system for converting VLBI observation data using coherent dedispersion and compensation algorithms for two-bit signal sampling. Coherent dedispersion is the key to processing pulsar observations to obtain the highest temporal resolution. Correction for signal sampling makes it possible to eliminate parasitic effects that interfere with the analysis of pulsar diffraction patterns. A pipeline has been established that uses the developed converter and the Astro Space Center software correlator. It allows us to reprocess all Radioastron pulsar observations and conduct a search for giant pulses, which requires the highest temporal resolution possible.

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脉冲星射电发射相干去色散处理系统

我们的研究为脉冲星研究人员提供了利用VLBI数据来观察脉冲星射电发射的可能性，这些数据具有宽带VLBI记录仪典型的极端时间分辨率。脉冲星会发射短于一微秒的微脉冲和巨脉冲。短脉冲持续时间表示高亮度温度。这限制了脉冲星射电发射机制的物理性质，其理论尚未完全理解。本文介绍了一种利用相干去色散和补偿算法对VLBI观测数据进行转换的系统。相干去色散是处理脉冲星观测以获得最高时间分辨率的关键。信号采样的校正使得消除干扰脉冲星衍射图分析的寄生效应成为可能。利用所研制的变换器和宇航中心软件相关器，建立了相应的管道。它允许我们重新处理所有射电天星脉冲星观测，并进行巨大脉冲的搜索，这需要尽可能高的时间分辨率。

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来源期刊

Astronomy and Computing ASTRONOMY & ASTROPHYSICSCOMPUTER SCIENCE,-COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

CiteScore

4.10

自引率

8.00%

发文量

期刊介绍： Astronomy and Computing is a peer-reviewed journal that focuses on the broad area between astronomy, computer science and information technology. The journal aims to publish the work of scientists and (software) engineers in all aspects of astronomical computing, including the collection, analysis, reduction, visualisation, preservation and dissemination of data, and the development of astronomical software and simulations. The journal covers applications for academic computer science techniques to astronomy, as well as novel applications of information technologies within astronomy.