| 基于Lomb算法的非等间距VLBI观测资料频谱分析研究 |
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| 引用本文： | 简念川,王广利,李金岭,张波.基于Lomb算法的非等间距VLBI观测资料频谱分析研究[J].天文学报,2006,47(3):336-347. |
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| 作者姓名： | 简念川 王广利 李金岭 张波 |
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| 作者单位： | 中国科学院上海天文台,上海,200030 |
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| 基金项目： | 国家自然科学基金(10473019,10173019)，中科院创新工程(KJCX2-SW-T1)资助项目 |
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| 摘 要： | 研究非等间距采样频谱分析中所发生的虚假信号问题．利用Lomb非等间距频谱分析方法对准多周期采样的模拟资料和VLBI实测资料进行频谱分析,得出了准多周期采样会产生虚假谱峰的结论．通过对频谱特征的分析,给出了虚假谱峰的位置分布的经验公式并从统计学角度证明了该公式．利用该公式可以确认准多周期采样频谱分析中的虚假谱峰位置,同时对公式的具体应用进行了讨论．其结论是基于VLBI的观测资料采样特征得到的,但同样适用于一般的准多周期采样资料的频谱分析．
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| 关 键 词： | 天体测量学 VLBI数据分析 频谱分析 |
| 修稿时间： | 2005年5月9日 |
A Study about the Formational Mechanism of Fake Signals in Spectrum Analysis of Unevenly Sampled Data from VLBI Measurements |
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| JIAN Nian-chuan,WANG Guang-li,LI Jin-ling,ZHANG Bo.A Study about the Formational Mechanism of Fake Signals in Spectrum Analysis of Unevenly Sampled Data from VLBI Measurements[J].Acta Astronomica Sinica,2006,47(3):336-347. |
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| Authors: | JIAN Nian-chuan WANG Guang-li LI Jin-ling ZHANG Bo |
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| Abstract: | A study of the problem about the fake signals derived from spectrum analysis on unevenly sampled data is presented. It concludes that fake signals will appear when using Lomb spectrum analysis of quasi-multi-period sampling data from VLBI experiments. An experiential formula to identify the fake peaks and a statistical proving are given. By this formula can identify the positions of fake signals. And it can also discuss how to use this formula in spectrum analysis. Although the conclusion is based on the VLBI data spectrum analysis, it can be used widely as well. |
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| Keywords: | Astrometry VLBI data analysis spectrum analysis |
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