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Abstract

Differential Global Positioning System (DGPS) observations are utilised for a wide range of
applications. Users take their accuracy requirements into consideration when selecting from
available observables, either in real-time or in post-processed mode. These accuracy requirements
range from metres to millimetres and are closely linked to economic considerations, since the cost
of the necessary hardware varies significantly. This study investigates and compares several
pseudo-range data sources available in Tasmania, Australia, either at a cost or free of charge. The
quality of the differential data and correction sources is assessed by determining accuracy relative
to the State’s primary geodetic control network as a function of distance from reference receivers.
Datum differences are routinely overlooked by practitioners utilising code measurements, hence we
quantify how this affects the accuracy achievable with real-time pseudo-range based DGPS
services. Simple coordinate shifts are proposed to effectively consider these datum differences in
practice for sub-metre pseudo-range DGPS positioning in Tasmania. A comparison to the accuracy
achievable with available carrier phase based correction data sources is also presented.

Item Type:	Article
Authors/Creators:	Magee, J and Janssen, V
Keywords:	DGPS, correction services, Tasmania, datum
Journal or Publication Title:	Journal of Geospatial Engineering
ISSN:	1563-3772
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