Noise Model Establishment and Analysis of IGS Reference Station Coordinate Time Series inside China
QU Xiaochuan · Acta Geodaetica et Cartographica Sinica · 2012
Focusing on the coordinate time series of 11 IGS reference stations in China mainland and Taiwan region during period of 1995 to 2010 under ITRF2005,noise analysis has been implemented using different noise model combination.Meanwhile,impacts of different surface mass loadings on station displacement have been calculated,such as atmospheric pressure loading,nontidal ocean loading,snow depth and soil moisture loading.From these analyses,optimal noise models of different station components before and after surface mass loading correction have been obtained.Conclusion is drawn that noise model of IGS station coordinate time series in China represent diversity characteristics with different noise feature among different components,mainly behaving as flicker noise plus white noise model as well as band pass plus power law plus white noise model.Other complicated noise models also account for a certain proportion,which is different from the existing results.Furthermore,relationship has been analyzed quantitatively among noise model,surface mass loading together with station's linear velocity and its uncertainty respectively.It is found that different complicated noise models would influence station's linear velocity and its uncertainty with maximum discrepancy larger than 1 mm/a.Besides,the calculated four kinds of surface mass loading could introduce noise changes mainly representing as band pass and random walk characteristics.