| Analysis on the noises from continuously monitoring GPS sites |
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| 作者姓名： | 黄立人 符养 |
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| 作者单位： | First Crust Monitoring and Application Center China Earthquake Administration，Beijing Institute of Applied Meteorology，Tianjin 300180，China，Beijing 100029，China |
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| 基金项目： | Special project of China Earthquake Administration“Study on the Integrated Observation of Vertical Crustal Move-ment and Deformation of South-North Seismic Zone on the Chinese Mainland”. |
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| 摘 要： | In this paper,we analyze the time series of site coordinates of 27 continuously monitoring GPS sites covered bythe Crustal Movement Observation Network of China over the whole country.The data are obtained in the periodfrom the beginning of the observation to the November of 2005.On the basis of data processing,we analyze thepower spectrum density of coordinate component noise at each site and calculate the spectral indexes manifestingthe noise property of each component.The spectral indexes indicate that for most sites,the noise of time series ofeach coordinate component can be addressed by the model of white noise flicker noise;and for a small amountof sites,it can be described by the model of white noise flicker noise random walk noise.We also quantita-tively estimate each noise component in the model by using the criterion of maximum likelihood estimation.Theresult shows that the white noise in the time series of GPS site coordinates does not constitute the main part ofnoise.Therefore,the error estimation of site movement parameters is usually too small,or too optimistic if weconsider the white noise only.Correspondingly,if this factor is not fully considered in explaining these movementparameters,it might mislead the readers.
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| 关 键 词： | 连续监测GPS站点 噪声分析 时间序列 最大似然估计 地壳变形 观测数据分析 |
| 文章编号： | 1000-9116（2007）02-0206-06 |
| 收稿时间： | 2006-07-06 |
| 修稿时间： | 2007-01-18 |
Analysis on the noises from continuously monitoring GPS sites |
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| Huang Li-ren,and Fu Yang.Analysis on the noises from continuously monitoring GPS sites[J].Acta Seismologica Sinica(English Edition),2007,20(2):206-211. |
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| Authors: | Huang Li-ren and Fu Yang |
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| Institution: | (1) First Crust Monitoring and Application Center, China Earthquake Administration, Tianjin, 300180, China;(2) Beijing Institute of Applied Meteorology, Beijing, 100029, China |
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| Abstract: | In this paper,we analyze the time series of site coordinates of 27 continuously monitoring GPS sites covered by the Crustal Movement Observation Network of China over the whole country.The data are obtained in the period from the beginning of the observation to the November of 2005.On the basis of data processing,we analyze the power spectrum density of coordinate component noise at each site and calculate the spectral indexes manifesting the noise property of each component.The spectral indexes indicate that for most sites,the noise of time series of each coordinate component can be addressed by the model of white noise flicker noise;and for a small amount of sites,it can be described by the model of white noise flicker noise random walk noise.We also quantita-tively estimate each noise component in the model by using the criterion of maximum likelihood estimation.The result shows that the white noise in the time series of GPS site coordinates does not constitute the main part of noise.Therefore,the error estimation of site movement parameters is usually too small,or too optimistic if we consider the white noise only.Correspondingly,if this factor is not fully considered in explaining these movement parameters,it might mislead the readers. |
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| Keywords: | continuously monitoring GPS sites time series spectral index noise component maximum likelihood estimation |
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