Document Type
Conference Proceeding
Publication Date
2003
Department
Marine Science
Abstract
It has been shown in the past that differential GPS carrier phase kinematic position accuracy tends to degrade as baseline length increases. This position solution degradation is due to several factors, primarily, errors attributed to the spatial variation of atmospheric delays (and secondly, errors in the satellite orbit). This paper endeavours to assess the magnitude of these effects on the position solutions using various base stations located at distances between 1 and 200+ km. away from the vessel. The assessment will be based on data collected on the Chesapeake Bay during July 1999, in three consecutive days. The data were collected by an Ashtech Z12 receiver mounted on the NOS S/V Bay Hydrographer. The baselines used in the assessment were processed using an ionospheric delay-free processing technique. A local truth trajectory was established while the vessel was close enough to base station TANG to employ integer fixed RTK. This procedure yielded results that agreed with the “truth” trajectory to the decimetre level in latitude, longitude and height.
Recommended Citation
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