IGeoE: Positional quality control with different rtk positioning methods

António Jaime Gago Afonso, Rui Alberto Ferreira Coelho Dias, Rui Francisco da Silva Teodoro
Data Acquisition Department, Army Geographic Institute, Lisbon, Portugal, 
Av. Dr. Alfredo Bensaúde 1849-014 Lisboa, 
afonso@igeoe.pt, ruidias@igeoe.pt, rteodoro@igeoe.pt

Abstract
The Army Geographic Institute (IGeoE) uses in its several topography works GPS equipments using the RTK positioning technique (Real Time Kinernatic). However there are several associated limitations related with human resources or with the accuracy obtained as GPS Rover stands away of the base.To minimize these problems, in the end of 2005 the IGeoE implemented in the Lisbon area a GPS network  of 7 reference stations GPS for RTK use. During the first quarter of 2006 several Positional Quality Control tests were made with the objective of evaluating the human needs to perform this control and the positional quality of the coordinates obtained by these two new positioning methods that are the Network versus Single Base Station methods. In the case of RTK network the tests that were made included well-known points in the interior, in the bounds and outside the area of this network. This article describes, in a briefly way, the main phases of the work done in what concerns the Positional Quality Control of the positioning methods referred above.

Keywords: network, GPS, RTK

In: Caetano, M. and Painho, M. (eds). Proceedings of the 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences, 5 – 7 July 2006, Lisboa, Instituto Geográfico Português

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