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Authors: Teza, G.* 
Pesci, A.* 
Casula, G.* 
Title: SURMODERR: A MATLAB toolbox for estimation of velocity uncertainties of a non-permanent GPS station
Issue Date: 2-Mar-2010
Series/Report no.: /36(2010)
DOI: 10.1016/j.cageo.2010.03.003
Keywords: Non-permanent GPS
Episodic GPS
Campaign-style GPS
Velocity field
Strain rate
Survey optimization
Subject Classification04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy 
04. Solid Earth::04.03. Geodesy::04.03.09. Instruments and techniques 
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
Abstract: SURMODERR is a MATLAB toolbox intended for the estimation of reliable velocity uncertainties of a non-permanent GPS station (NPS), i.e. a GPS receiver used in campaign-style measurements. The implemented method is based on the subsampling of daily coordinate time series of one or more continuous GPS stations located inside or close to the area where the NPSs are installed. The continuous time series are subsampled according to real or planned occupation tables and random errors occurring in antenna replacement on different surveys are taken into account. In order to overcome the uncertainty underestimation that typically characterizes short duration GPS time series, statistical analysis of the simulated data is performed to estimate the velocity uncertainties of this real NPS. The basic hypotheses needed to apply the method are: i) the signal must be a long-term linear trend plus seasonal and colored noise for each coordinate; ii) the standard data processing should have already been performed to provide daily data series; iii) if the method is applied to survey planning, the future behavior should not be significantly different from the past behavior. In order to show the strength of the approach, two case studies with real data are presented and discussed (Central Apennine and Panarea Island, Italy). Keywords: Non-permanent GPS; Episodic GPS; Campaign-style GPS; Velocity Field; Strain Rate; Survey Optimization.
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