The Variation Analysis Of CORS Height Time Series In China

CORS was born in the20th century, is product of the GPS/GNSS technology.After10years of continuous development, coordinate time series data of CORS networkare continuously accumulated, the single day solution of height component can bewidely used in many ways.But due to seasonal changes of the station coordinate,soperiod campaign of elevation time series need to be analyzed.In this paper, observations of eleven years (from1999.1to2009.12) are used fromCrustal Movement Observation Network Of China (Crustal Movement ObservationNetwork Of China, CMONOC). GPS data were calculated by the GAMIT/GLOBKbased on obtained GPS coordinate series. Trigonometric model is used to fit the periodpart of height time series according to the data of pre-processing,andanalyzing the frequency, amplitude of periodic motion.Research the seasonal changeof periodic motion in height component of CORS coordinates,revealing movement rulesof CORS in height component.The following work was done in this paper:1Analysis of impact on time series of missing data based on different interpolationmethodsGPS height time series are not continuous,so interpolation is needed for theapplication of spectrum analysis and wavelet analysis to obtain time series of uniformsampling.Lagrange,cubic spline and orthogonal polynomial fitting are used tointerpolate for missing point, comparing interpolation effect of the differentinterpolation methods, the comparison analysis have found that lagrange and cubicspline are suitable for continuous less missing point, Orthogonal polynomial fittingprovides time series data with a better solution for the continuous more missing point.2Spectral analysis and wavelet analysis of CORS height time seriesThrough the method of power spectrum and wavelet technology, we analyzeperiodic change law of the CORS height time series and the factors affecting the change.The CORS exists in semi-annual periodic motion and annual periodic motion mainly,especially with the annual periodic motion. 3Effect analysis of height velocity field in long spanThe polynomial function model established is used to calculate velocity field of theCORS height component, and Linear fitting is used to calculate velocity field of heightcomponent for site of regional network, According to vertical velocity of the referencestation and regional site, characteristic of crustal vertical deformation for large scale inChina is analyzed in this paper. Most area are in the rising movement trend in China, theSichuan-Yunnan block and Beijing region are in settlement mainly.