Multivariate analysis of GPS position time series of JPL second reprocessing campaign
Autor: | Alireza Amiri-Simkooei, Donald F. Argus, Tannaz H. Mohammadloo |
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Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Multivariate statistics
010504 meteorology & atmospheric sciences Meteorology business.industry GPS position time series Flicker assessment JPL second reprocessing campaign 010502 geochemistry & geophysics Random walk 01 natural sciences Geophysics Amplitude Geochemistry and Petrology Global Positioning System Environmental science Phase center Flicker noise Multivariate power spectrum Computers in Earth Sciences business Noise (radio) 0105 earth and related environmental sciences |
Zdroj: | Journal of Geodesy |
ISSN: | 0949-7714 |
DOI: | 10.1007/s00190-016-0991-9 |
Popis: | The second reprocessing of all GPS data gathered by the Analysis Centers of IGS was conducted in late 2013 using the latest models and methodologies. Improved models of antenna phase center variations and solar radiation pressure in JPL’s reanalysis are expected to significantly reduce errors. In an earlier work, JPL estimates of position time series, termed first reprocessing campaign, were examined in terms of their spatial and temporal correlation, power spectra, and draconitic signal. Similar analyses are applied to GPS time series at 89 and 66 sites of the second reanalysis with the time span of 7 and 21 years, respectively, to study possible improvements. Our results indicate that the spatial correlations are reduced on average by a factor of 1.25. While the white and flicker noise amplitudes for all components are reduced by 29–56 %, the random walk amplitude is enlarged. The white, flicker, and random walk noise amount to rate errors of, respectively, 0.01, 0.12, and 0.09 mm/yr in the horizontal and 0.04, 0.41 and 0.3 mm/yr in the vertical. Signals reported previously, such as those with periods of 13.63, 14.76, 5.5, and 351.4 / n for $$n=1,2,{\ldots },8$$ days, are identified in multivariate spectra of both data sets. The oscillation of the draconitic signal is reduced by factors of 1.87, 1.87, and 1.68 in the east, north and up components, respectively. Two other signals with Chandlerian period and a period of 380 days can also be detected. |
Databáze: | OpenAIRE |
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