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Abstract
The South African Network of Continuously
Operating GPS Base Stations
Richard Wonnacott
Director of Survey
Services, Chief
Directorate: Surveys
and Mapping, South
Africa
One of the responsibilities of the Chief Directorate: Surveys and Mapping (CDSM) is
the establishment and maintenance of a national control survey network. The network
of trigonometrical beacons and town survey marks is known as a passive network
which consists of nearly 29000 trigonometrical beacons alone. The introduction
of space based global navigation satellite systems, such as GPS, opened up the potential
for CDSM to provide an active control survey network in the form of a network of
continuously operating GPS base stations. CDSM has adopted GPS technology to
establish such a network of base stations known as TrigNet and which currently consists
of 45 stations distributed throughout South Africa. The paper describes the basic
architecture, the post processing and real time services and the methods of delivery of
such services, the current status, applications and future developments of TrigNet.
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