Comparison Of Ppp And Double Differencing Solutions Case Study Campaign Gps Stations In Tanzania

Satellite Positioning systems are world-wide precise positioning systems and very useful for geodeticrnsurveys, crustal deformation studies, station coordinates, absolute and relative station velocities.rnTwo techniques for GPS data processing to obtain station position coordinates exist. The two methodsrnare Differencing of observations, and Zero differencing techniques, known as Precise PointrnPositioning.rnThe main aim of this study was to assess the accuracy of PPP Solution, using the already knownrnaccurate Double differencing solution.rnThe data used in this study are three episodes’ campaign GPS stations in Tanzania established in 2006,rn2008 and 2010. The data sets are available in RINEX format from the UNAVCO website.rnDouble differencing was done using GAMIT_GLOBK software, in this case, the campaign data wererncombined in a solution experiment with reference GPS data for IGS stations in Africa, active fromrn2006-2010.rnThe PPP solution was obtained from APPS (online-GIPSY/OASIS). Other available online PPPrnsolution services were also used for comparison purposes. The results from APPS PPP solution wererncompared with GAMIT/GLOB DGPS solution in order to assess the accuracy of PPP.rnFrom 330, 24hours epochs of observations the results show that the range of the difference betweenrnGAMIT/GLOBK and APPS PPP solution is -3.7 to 5.6cm in X component, -3.8 to 5.0cm in Yrncomponent and -1cm to 3.4cm in the Z component. The residuals of coordinates (δX, δY and δZ) fromrnthe two solutions have mean value of 5.9mm in X component, 1.2mm in Y component and 0.4mm in Zrncomponent. Also the standard deviations in δX, δY and δZ are 11mm, 10mm and 4mm respectively.rnFrom the results analysis it has been shown that in most cases, for the data set used, PPP solution isrnvery close to DGPS solution.rnKey words: Precise Point Positioning (PPP) Differential GPS (DGPS)

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