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This research was financed by the Spanish Ministry of Science and Innovation (AYA2009-10209 and CSD2006-0041 projects). Support provided by the Cartography Service of the Department of Public Works and Land Planning (Region of Murcia), the Directorate General of Natural Heritage and Biodiversity of the Department of Agriculture and Water (Region of Murcia), and the Valencian Cartography Institute during this project is gratefully acknowledged. We appreciate the valuable comments of the reviewers, which contributed to the improvement of this paper.

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Surveying at the limits of local RTK networks: Test results from the perspective of high accuracy users

Publicat a:International Journal Of Applied Earth Observation And Geoinformation. 13 (2): 256-264 - 2011-04-01 13(2), DOI: 10.1016/j.jag.2010.12.001

Autors: Selmira Garrido, Ma; Gimenez, Elena; Clara de Lacy, Ma; Gil, Antonio J

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Precise GNSS-based differential positioning in real time is usually known as the real-time kinematics (RTK) technique. RTK reduces the effects of orbit errors and ionospheric and tropospheric refraction by forming differences between the observables (e.g. double-differences). These effects, however, grow with increasing baseline length, although the use of corrections generated in real-time from an active GNSS network allows these distance-dependent errors to be reduced. This technology increases the reliability of the system and thereby the accuracy of real-time positioning. In this study, the test results of RTK positioning at different test points located in the border area between the Autonomous Communities of the Region of Murcia and the Community of Valencia, in SE Spain, are presented. The analysis is based on three GNSS local active networks present in this border area, namely MERISTEMUM, REGAM and ERVA networks. Test measurements with RTK rover were performed in this region in order to analyze the real-time services offered by these three networks. Moreover, precise coordinates for each test point were determined using Bernese 5.0. The results confirm that it is possible to achieve centimetre-scale accuracy with RTK positioning based on the networks studied, even in border regions. (c) 2010 Elsevier B.V. All rights reserved.

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