Spatiotemporal Signal and Noise Analysis of GPS Position Time Series of the Permanent Stations in China
This paper aims to analyze the signal and noise characteristics of the GPS position time series of the permanent stations in China. We first extract the Common Mode Components (CMC) from the position series of regional GPS stations using principal component analysis and separate the GPS station position time series into CMC and the filtered series of each station. Then we detect the Unmodeled Common Signals (UCS) and Common Noises (CN) in CMC using power spectrum analysis, and analyze the noise characteristics of CN using a MINQUE (Minimum Norm Quadratic Unbiased Estimation) method of variance component estimation. We also detect periodic signals using power spectrum analysis and analyze different noise components using MINQUE method from the filtered series. Total 7-year GPS station position time series of the 24 permanent stations in China have been processed. The results show that the CMC accounts for 38.8 %, 39.1 % and 32.7 % from the total variances in north, east and up, respectively. CMC are dominated by CN. The dominant periods of UCS are about 792 days in north and up and about 594 days in east. In CN, the flicker noise is slightly larger than the white noise, and the random walk noise is very small. The periodic signals are all significant in the filtered series of all stations, especially the annual signals in up direction. Furthermore, the flicker noise of filtered series is also slightly larger than the white noise; however random walk noise is significantly large in most stations and even larger than white or flicker noise in few stations.
KeywordsGPS station position time series Common mode component Spatial filtering MINQUE Noise component
The work was major supported by the National Natural Science Funds of China (Grant No. 41074018) and National key Basic Research Program of China (973 Program, Projects:2012CB957703), and partially supported by the National Natural Science Funds of China (Grant No. 40874016) and Kwang-Hua Fund for College of Civil Engineering, Tongji University. Dr. Bofeng Li from Curtin University is appreciated for polishing English for the paper. The coordinate series data was download from CMONOC, which is accessible at http://www.igs.org.cn:8080/.
- Dong D, Fang P, Bock Y, Webb F, Prawirodirdjo L, Kedar S, Jamason P (2006) Spatiotemporal filtering using principal component analysis and Karhunen-Loeve expansion approaches for regional GPS network analysis. J Geophys Res 111:3405–3421Google Scholar
- Huang Z (1983) Spectral analysis method and its application in hydrology meteorology. China Meteorological Press, Beijing (in Chinese)Google Scholar
- Nikolaidis R (2002) Observation of geodetic and seismic deformation with the global positioning system. University of California, San DigeoGoogle Scholar
- Wdowinski S, Bock Y, Baser G, Prawirodirdjo L, Bechor N, Naaman S, Knafo R, Forrai Y, Melzer Y (2004) GPS measurements of current crustal movements along the Dead Sea Fault. J Geophys Res 109, B05403. doi: 10.1029/2003JB002640
- Williams SDP, Bock Y, Fang P, Jamason P, Nikolaidis RM, Prawirodirdjo L, Miller M, Johnson DJ (2004) Error analysis of continuous GPS position time series. J Geophys Res 109, B03412. doi: 10.1029/2003JB002741