西安电子科技大学学报（自然科学版）2016，Vol.43Issue(5)：147-152,6.DOI:10.3969/j.issn.1001-2400.2016.05.026
快速最大似然估计用于脉冲星时间延迟测量
Method of time delay measurement based on fast maximum likelihood for pulsar pulse profile
江若玫 1佘颜2
作者信息
- 1. 西安交通大学城市学院，陕西西安 710018
- 2. 西安电子科技大学微电子学院，陕西西安 710071
- 折叠
摘要
Abstract
The time delay of the pulsar integrated pulse profile relative to the standard pulse profile is one of the important observations in an X‐ray pulsar‐based navigation system , with the measuring accuracy directly affecting the the pulsar‐based navigation system . In order to improve the measuring accuracy of the time delay of the pulsar integrated pulse profile and reduce the computation complexity , a method called fast maximum likelihood ( FML) estimation is proposed in this paper , which first distills the pulse profile of the X‐ray pulsar by the epoch folding . Then , the likelihood function is estimated to obtain the time delay of the pulsar integrated pulse profile . This paper also improves the fast maximum likelihood time delay estimation by narrowing the phase interval of the standard pulse profile and combines rough estimation with accurate estimation to effectively compute the time delay . Real pulsar data observed by the Rossi X‐ray Timing Explorer ( RXTE) are used to validate the effectiveness of the proposed method from the aspects of the observed time and computational complexity . Compared with the Taylor FFT algorithm , the measurement accuracy of the proposed method can be significantly improved while keeping the total computational complexity .关键词
X射线脉冲星/脉冲轮廓/历元折叠/时间延迟量/快速最大似然估计Key words
X-ray pulsar/pulse profile/epoch folding/time delay/fast maximum likelihood estimation分类
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江若玫,佘颜..快速最大似然估计用于脉冲星时间延迟测量[J].西安电子科技大学学报（自然科学版）,2016,43(5):147-152,6.
