Abstract
In this study, for Istanbul, there are two Cors Networks (Cors-TR, Iski Cors) providing Virtual Reference Station (VRS), and Flachen Korrektur Parameter (FKP), corrections to rover receiver for determining 3-D positions in real time by Global Positioning System (GPS). To determine which method (or technique) provides accurate method for position fixing, a test network consisting of 49 stations was set up in Yildiz Technical University Davudpasa Campus. The coordinates of the stations in the test network were determined by conventional geodetic, classical RTK, VRS and FKP methods serviced by both Cors-TR and Iski Cors. The results were compared to the coordinates by the conventional method by using total station. The results showed a complex structure as the accuracy differs from one component to another such as in horizontal coordinates, Y components by CorsTR_VRS and Cors_TR_ FKP showed 'best' results while the same technique provided X components consistent accuracy with the Y component but less accurate than by real time kinematic (RTK). In vertical components, of all the techniques used for the h components, CorsTR_VRS showed 'best' accuracy with three outliers.
Highlights
Global Positioning System (GPS) can provide position fixing in cm level when used in differential mode (Seeber, 2003)
This paper aims at determining accurate method among CorsTR_VRS, CorsTR_FKP, IskiCors_VRS, IskiCors_FKP and classical Real Time Kinematic (RTK) compared to the coordinates obtained by conventional geodetic position fixing method using total stations
To investigate accurate methods we have used for 3-D positioning by GPS technology, accuracy estimation were performed by taking coordinate differences between true coordinates and the coordinates by classical RTK, CorsTR_FKP, CorsTR_VRS, IskiCors_FKP, and IskiCors_VRS have been taken correspondingly
Summary
Global Positioning System (GPS) can provide position fixing in cm level when used in differential mode (Seeber, 2003). To provide cm level accuracy in position fixing using GPS, countries establish country-wide-cors (Continuously Operating Reference Stations) network (Sunantyo, 2009). It provides a stable and precise positioning in real time. A number of methods or techniques for calculating correction parameters exists namely; virtual reference station (VRS) (Wanninger, 2003), linear area corrections (Flachen Korrektur Parameter =FKP) (Wübbena & Bagge, 1998) and Master Auxiliary Concept (MAC) Methods (Brown et al, 2005). They have advantageous and disadvantageous over one another. Few studies done to investigate the accurate methods include Eren et al (2009) and
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