Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Position Error Propagation of Reference Stations in Relative Positioning Using GNSS Phase Double Difference Observations

Document Type : Original Research Paper

Author
Yahya Djamour
Geomatics College National Cartographic Center of I.R. Iran Meraj st., Azadi sq., Tehran, IRAN, P.Box: 13185-1684
10.22071/gsj.2011.55246
Abstract
Today, the best coordinates of stations on the ground are obtained by using Global Navigation Satellite Systems (GNSS) such as Global Positioning System (GPS). There are many error sources affecting the GNSS observations that limit the required accuracies. But differential positioning methods, like double difference, are big helps to us to achieve an accuracy of millimeter. Differential operation of GNSS is based on placing a reference station with a GNSS receiver at a known location. One of such errors is the coordinate error of reference station and its propagation on unknown stations. In fact the coordinates of a reference station should be known in a reference system coordinate, such as WGS84 used in GPS, which we usually assume is exactly known. In practice, the position of the reference station in the reference system coordinate may not be exactly known due to different reasons. Therefore, in this study, the effect of the reference station position errors on various ranges from ~4 km to ~90 km, in static mode and using double difference carrier phase, is investigated. The results show this effect could be of the order of a few ppm depending on error magnitude of reference position and the range of baseline. 
 
Keywords
Differential Positioning
Double Difference Phase Observation
Reference Station Position Error
Unknown Station Position Error
Reference System Coordinate WGS84
Range of Baseline
GPS
References
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Scientific Quarterly Journal of Geosciences
Volume 20, Issue 80
Winter 2011
Pages 149-154