| GPS时间序列噪声特性分析——尼泊尔与藏南为例 |
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| 引用本文： | 许伟,司延发.GPS时间序列噪声特性分析——尼泊尔与藏南为例[J].测绘工程,2020(1):23-30. |
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| 作者姓名： | 许伟 司延发 |
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| 作者单位： | 青海省第二测绘院;中国地质大学（武汉） |
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| 摘 要： | 选取喜马拉雅地震带上尼泊尔与藏南地区16个IGS台站近三年的GPS时间序列数据,通过编程计算进行详细分析。利用GPS单站、单日解观测序列James L.Davis周期模型对所有IGS台站进行线性变化速率,周期、半周期系数及残差序列的提取。对残差序列中存在数据缺失的时间段,采用3次样条差值拟合方法补齐缺失数据,按照3倍中误差限差原则剔除孤立点。对提取的残差序列所包含的非构造运动引起的时空相关噪声,应用主成分PCA/KLE方法对整个测区的共模误差(CME)进行分析,对剔除CME后的噪声采用功率谱分析方法确定该地区的噪声类型为"闪烁噪声+白噪声"。
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| 关 键 词： | 时间序列 CME PCA/KLE分析 功率谱分析 |
Analysis of the noise characteristics of GPS time series about Nepal and Southern Tibet |
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| XU Wei,SI Yanfa.Analysis of the noise characteristics of GPS time series about Nepal and Southern Tibet[J].Engineering of Surveying and Mapping,2020(1):23-30. |
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| Authors: | XU Wei SI Yanfa |
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| Institution: | (Oinghai Provincial 2nd Institute of Surveying&Mapping,Xining 810001,China;China University of Geosciences,Wuhan 430074,China) |
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| Abstract: | This paper has made a detailed analysis by programming on GPS time series data for 16 IGS stations in Himalaya earthquake belt Nepal and Southern Tibet region during the past three years. The linear velocity, periodic, semi periodic coefficient and residual sequence of the all IGS stations are extracted by using GPS and single day log model L.Davis James. Three order spline interpolation is used to fit up the data in which time the data is missing. According to the error margin of three times, the outliers are eliminated. The spatio-temporal correlation noise, is extracted from the residual sequence and caused by the non tectonic movement. The method of principal component PCA/KLE is used to analyze the common mode error(CME) of the entire survey area. Besides, the paper concludes the noise type of this region is "flicker noise + white noise " by using the power spectrum analysis while the noise after CME is removed. |
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| Keywords: | time series CME PCA/KLE analysis power spectrum analysis |
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