SOME ISSUES REGARDING SPATIAL POSITIONING WITH GPS SYSTEMS USING SIMPLE AND DUAL FREQUENCY RECEIVER
Journal Title: Natural Resources and Sustainable Development - Year 2013, Vol 3, Issue 1
Abstract
The current use of GNSS technology has diversified technological opportunities, due to the advent of new logistics represented by GPS receivers of various accuracy classes and the presence of a large infrastructure. The establishment of the national GPS network, especially active points represented by permanent GPS stations (considered Class A), allowed the use of GNSS recordings made by them for various topo-geodetic applications. To obtain relatively homogeneous results (using the same work algorithm), National Agency for Cadastre and Land Registration (ANCPI) has developed an application called TransDatRO to be used to transform coordinates of the national reference system. The case study was conducted in the town of Abram, Bihor County, in 2013 and had the objective to support the network necessary for compiling topographic General Urban Plan (GUP). Spatial positioning of topographic points (of interest) was achieved with GPS using 4 receivers with one frequency and a receiver with two frequencies, the data being used by GNSS GPS station Oradea. The primary recorded data were processed in two versions, the first version using transformation parameters recommended by the National Agency for Cadastre and Land Registration (ANCPI) for Bihor County, the application TransDatRO, and the second option used local transformation parameters with Trimble Total Control (TTC), obtained from previous practical applications in the study location. The results of the two processing methods showed that the differences obtained between the two sets of spatial coordinates of positioned topographic points, in principle, were determined by the accuracy of GPS positioning network, accuracy of the determination of surveying points and control points, common for the geodetic datum transformation we used. Computer software used in GNSS data processing had a relatively small influence on the spatial positioning accuracy of the topographic points.
Authors and Affiliations
Ghiță Cristian Crainic
Keywords
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