| X射线脉冲星导航中脉冲轮廓的频偏和时延算法 |
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| 引用本文： | 费保俊,潘高田,姚国政,杜健. X射线脉冲星导航中脉冲轮廓的频偏和时延算法[J]. 测绘学报, 2011, 0(Z1): 126-132 |
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| 作者姓名： | 费保俊 潘高田 姚国政 杜健 |
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| 作者单位： | 装甲兵工程学院基础部; |
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| 摘 要： | 观测轮廓与标准轮廓的频率偏差和时间延迟是X射线脉冲星导航的两个观测量,讨论其计算方法并提出如下改进意见:①对探测器的最小分辨时间作进一步的时间细分,在每一个小的时间间隔内接收的光子数可以假设满足二项分布,再对观测轮廓叠加可以求得更高精度的频偏;②将实际观测轮廓分为理想轮廓及其偏差两部分,而TOA是指理想轮廓与标准轮廓的时延,Sala等人提出的用相关函数求TOA方法仅对理想轮廓成立;③如果实际轮廓在测量过程中形状不变,则偏差产生的TOA估计误差为一常数。在此基础上提出实际观测轮廓的TOA估计方法,其计算精度小于探测器的最小分辨率。
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| 关 键 词： | X射线脉冲星自主导航 频率偏差 时间延迟 光子到达时间 |
Arithmetic of frequency drift and time delay between pulse profiles in XNAV |
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| FEI Baojun,PAN Gaotian,YAO Guozheng,DU Jian. Arithmetic of frequency drift and time delay between pulse profiles in XNAV[J]. Acta Geodaetica et Cartographica Sinica, 2011, 0(Z1): 126-132 |
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| Authors: | FEI Baojun PAN Gaotian YAO Guozheng DU Jian |
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| Affiliation: | FEI Baojun,PAN Gaotian,YAO Guozheng,DU Jian Department of Foundation,Academy of Armored Force Engineering,Beijing 100072,China |
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| Abstract: | The frequency drift and time delay are two measurement variables of XNAV.Here we systematically discuss the computation method and propose some modifications.First,we further divide the bin into smaller time-interval,and presume photons received in each interval comply with binomial distribution.The folding of observed profile on such interval results in more accurate frequency drift.The second,the observe profile can be divided into ideal profile and the bias,and the time-of-arrival(TOA) is time lag betwee... |
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| Keywords: | X-ray pulsar-based autonomous navigation(XNAV) frequency drift time delay photon time of arrival(TOA) |
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