Blar i NTNU Open på forfatter "Soltanpour, Ali"
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Improved determination of heights using a conversion surface by combining gravimetric quasi-geoid/geoid and GPS-levelling height differences
Nahavandchi, Hossein; Soltanpour, Ali (Peer reviewed; Journal article, 2006)The quasi-geoid/geoid can be determined from the Global Positioning System (GPS) ellipsoidal height and the normal/orthometric heights derived from levelling (GPS-levelling). In this study a gravimetric quasigeoid and ... -
Local ionospheric modelling of GPS code and carrier phase observations
Nahavandchi, Hossein; Soltanpour, Ali (Peer reviewed; Journal article, 2008)A limiting factor for successful ambiguity resolution in precise GPS positioning is the existence of un-modelled ionospheric errors in both the carrier phase and the pseudorange measurements. In this study, the ionospheric ... -
Recovery of marine gravity anomalies from ERS1, ERS2 and ENVISAT satellite altimetry data for geoid computations over Norway
Soltanpour, Ali; Nahavandchi, Hossein; Ghazavi, Kourosh (Peer reviewed; Journal article, 2007)Free-Air Anomalies (FAA) for the Norwegian marine area including some parts of the North Sea, the Norwegian Sea and the Barents Sea are computed from satellite altimetry data. A total of 84 cycles of ERS2 along-track data, ... -
The Use of Second-generation Wavelets to Combine a Gravimetric Quasigeoid Model with GPS-levelling Data
Soltanpour, Ali; Nahavandchi, Hossein; Featherstone, Will (Peer reviewed; Journal article, 2006)The merging of a gravimetric quasigeoid model with GPS-levelling data using second-generation wavelets is considered so as to provide better transformation of GPS ellipsoidal heights to normal heights. Since GPS-levelling ...