脉冲星VLBI观测软件相关处理进展

发布时间：2018-07-24 08:44

【摘要】：VLBI是进行高分辨率脉冲星观测研究的重要手段。脉冲星信号是非常微弱的脉冲序列,其VLBI观测面临多种挑战。在数据相关过程中采用有效技术提取脉冲星信号可提高观测成功率和精度。DiFX(Distributed FX-style Software Correlator)是目前国际上流行的开源软件相关处理机,它采用非相干消色散技术和"脉冲星数据分箱技术"(Pulsar Binning),在脉冲星VLBI观测数据的相关处理方面具有优异的性能。介绍了DiFX的构架,安装、调试方法,并对利用DiFX处理脉冲星VLBI观测数据的进展情况进行论述。利用单机环境下的DiFX,在普通模式和Pulsar Binning模式下对中国VLBI网(CVN)第一次脉冲星观测数据进行相关处理;利用德国马普射电天文研究所集群计算环境下的Bonn-DiFX,在PulsarBinning模式下对流量仅有2.6 mJy的毫秒脉冲星PSRJ1022+1001的欧洲VLBI网(EVN)观测数据成功进行相关处理。最后,对使用DiFX处理脉冲星观测数据情况进行总结,并展望了今后CVN开展脉冲星观测研究的前景。
[Abstract]:VLBI is an important method for high resolution pulsar observation. Pulsar signal is a very weak pulse sequence, its VLBI observation faces many challenges. In the process of data correlation, using effective technology to extract pulsar signal can improve the success rate and precision of observation. DiFX (Distributed FX-style Software Correlator) is a popular open source software correlation processor in the world. It uses incoherent dedispersion technique and pulsar data splitting technique (Pulsar Binning), which has excellent performance in the correlation processing of pulsar VLBI observation data. This paper introduces the framework, installation and debugging method of DiFX, and discusses the progress of using DiFX to deal with the VLBI observation data of pulsar. The first pulsar observation data of (CVN) in China VLBI net are processed by using DiFX in the common mode and Pulsar Binning mode. Using Bonn-DiFX in the cluster computing environment of the Maple Institute of Radio Astronomy in Germany, the (EVN) data of the European VLBI network (PSRJ1022 1001) with a flow rate of only 2.6 mJy are successfully processed in the PulsarBinning mode. Finally, the application of DiFX to the processing of pulsar observation data is summarized, and the prospect of pulsar observation by CVN in the future is prospected.
【作者单位】：中国科学院上海天文台;中国科学院射电天文重点实验室;中国科学院研究生院;中国科学院新疆天文台;
【基金】：国家自然科学基金(10625314、10821302,10633010) 中国科学院知识创新工程重要方向项目(KJCX2-YW-T03)
【分类号】：TP319;P111

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