Comparison between Windowed FFT and Hilbert-Huang Transform for Analyzing Time Series with.pdfVIP

下载本文档

4
0
约2.72万字
约 16页
2017-04-11 发布于江苏
举报
版权申诉

Comparison between Windowed FFT and Hilbert-Huang Transform for Analyzing Time Series with.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Comparison between Windowed FFT and Hilbert-Huang Transform for Analyzing Time Series with

a r X i v : a s t r o - p h / 0 6 0 9 0 1 2 v 1 1 S e p 2 0 0 6 Comparison between Windowed FFT and Hilbert-Huang Transform for Analyzing Time Series with Poissonian Fluctuations: A Case Study Dong Han1 and Shuang-Nan Zhang2, 3 ABSTRACT Hilbert-Huang Transform (HHT) is a novel data analysis technique for non- linear and non-stationary data. We present a time-frequency analysis of both simulated light curves and an X-ray burst from the X-ray burster 4U 1702-429 with both the HHT and the Windowed Fast Fourier Transform (WFFT) meth- ods. Our results show that the HHT method has failed in all cases for light curves with Poissonian fluctuations which are typical for all photon counting in- struments used in astronomy, whereas the WFFT method can sensitively detect the periodic signals in the presence of Poissonian fluctuations; the only draw- back of the WFFT method is that it cannot detect sharp frequency variations accurately. Subject headings: —methods: data analysis—stars: oscillations (including pulsations)— X-rays: bursts 1. INTRODUCTION In X-ray binaries, matter flows onto the neutron star or black hole through an accretion disk and X-rays are emitted by the accretion flow from inner regions that host the strongest gravitational fields in the Universe. The space time characteristics of the X-ray emitting regions lead to the conclusion that the dynamical time scale for the accretion process of X-ray emitting is millisecond. That means, the millisecond X-ray variability is caused by 1Department of Engineering Physics Center for Astrophysics, Tsinghua University, Beijing 100084; handong@mail.tsinghua.edu.cn 2Department of Physics Center for Astrophysics, Tsinghua University, Beijing 100084; zhangsn@mail.tsinghua.edu.cn 3Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 – 2 – orbital motion, neutron-star spin, disk- and neutron-star oscillations. So the millisecond X- ray variabilities are imp