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题名:
脉冲星信号相干消色散与非相干消色散的比较研究
其他题名: Comparative Study between the Coherent De-dispersion and the Incoherent De-dispersion of Pulsar Signal
作者: 黄玉祥1,2; 汪敏1; 郝龙飞1; 李志玄1; 徐永华1
刊名: 天文研究与技术(Astronomical Research & Technology)
出版日期: 2018-05
DOI: 10.14005/j.cnki.issn1672-7673.20180504.001
分类号: TN911.71
学科分类: 天文学::射电天文学
产权排序: 第1完成单位
收录类别: CSCD
关键词: 脉冲星 ; 相干消色散 ; 非相干消色散
中文摘要: 脉冲星信号在星际空间传播的过程中,由于星际介质的存在会造成观测到的脉冲星信号发生色散,因此我们需要对接收到的脉冲星信号进行消色散,以获得原始的脉冲星信号。目前,消色散方法主要分为两种,相干消色散和非相干消色散。相对来说相干消色散效果彻底,算法较简单,而且能保留原始数据的时间分辨率,不过计算量较大,但是现在快速进步的计算机技术已经使计算量的问题得到很好的解决。为了精确了解两种消色散方法的区别,本文利用相关系数的方法定量地比较了相干消色散、非相干消色散两种方法的效果:在一定的频率值之下,前者得到消色散效果优于后者。同时确定两种消色散方法在效果相同时的观测频率。
英文摘要: Spreadingthroughinthe interstellar space,pulsar signals, due to the existence of the
interstellar medium, would be observed dispersively, therefore we need to remove dispersion ofthe received pulsar signals for obtaining the original pulsar signals. The current de-dispersion methods are mainly divided into two types, coherent de-dispersion and incoherent de-dispersion. Relatively speaking,the former is able to eliminate dispersion completely, which has simpler algorithm, and preserves the time resolution of the original signal, but has the larger amount of calculation. But the rapid progress of computer technology has already solved the problem of calculated amount. In order to accurately understand the difference between the two methods of de-dispersion, this paper, adoptingthe method of coherence coefficient, quantitatively compares the effects of coherent de-dispersion and incoherent de-dispersion:below a certain frequency, the former is better than the latter in obtaining the de-dispersion effects. Meanwhile, the observed frequency of the two de-dispersion methods at the same effect is determined.
项目资助者: 国家自然科学基金资助项目(U1631237)
语种: 中文
ISSN号: 1672-7673
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12159
Appears in Collections:射电天文研究组_期刊论文

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作者单位: 1.中国科学院云南天文台,云南,昆明,650011
2.中国科学院大学,北京,100049

Recommended Citation:
黄玉祥,汪敏,郝龙飞,等. 脉冲星信号相干消色散与非相干消色散的比较研究[J]. 天文研究与技术(Astronomical Research & Technology),2018.
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文件名: 脉冲星信号相干消色散与非相干消色散的比较研究_黄玉祥.pdf
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