Bulletin des sciences géographiques de l'INCT
Volume 13, Numéro 2, Pages 29-36
2009-11-30
New Products Of The Epn Time Series Special Project: Status Report
Authors : Kenyeres Arnbrus .
Abstract
The main task of the Time Series Analysis Special Project is the monitoring of the EPN weekly combined SINEX solutions in order to fur1her improve the quality of the EPN products. The routine monitoring involves cleaning of the individual station coordinate time series and the maintenance and publication of the detected coordinate offsets and out liers. This infonnation has also been used for the computation of the ITRF2005 and its regional densification. Using the CATREF software (Altamimi et al 2004) cleaned cumulative solutions are also computed and analyzed. The estimated coordinates and velocities, together with the outlier and offset database are regularly updated and published on the EPN CB website. Beyond the routine monitoring the noise and hatmonic analysis of the EPN coordinate series has been started. The analysis is being done with the CATS software (Williams SD, Proudman Oceanographie Laboratory), which uses the MLE (Maximum Likelihood Estimator) approach to determine the noise characteristic and seasonal variation of the coordinate time series. The noise analysis proved the presence of the coloured noise in the EPN time series. The use of the right noise characteristics allowed the computation of more realistic station velocity uncertainties. The hatmonic analysis covered the estimation of the amplitudes and phase lags of the seasonal signal may present in the time series. The analysis bas shown moderate seasonal amplitudes, 1-2 mm for the horizontal and 2-4 mm for the vertical component. The phase lag distribution for the horizontal cornponents are not random, well determined phase lag values were found. The up component phase lag distribution is totally different, it is more uniforn1 without peaks. The physical reality of the phase lag values is not yet studied. The results and products are published and regularly updated at the TimeSeries section of the EPNCB website.
Keywords
New Products of the EPN Time Series Special Project: Status Report
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