Abstract
The latest evolution in digital wireless technology, third-generation (3G) Code Division Multiple Access/Single Carrier (CDMA2000/1X) wireless network, is applicable for transmitting real-time kinematic (RTK) GPS correction messages. Fast and reliable, publicly available wireless networks, combined with highly accessible Internet connectivity, allows the multicasting of messages to mobile users, who are no longer restricted to traditional private UHF wireless networks. Nationwide public wireless network systems continue to expand and can provide an inexpensive infrastructure for the emerging multi-reference network system. Transmission performance via the Internet-based CDMA2000/1X outperforms UHF technology in transmission throughput and latency, as well as in the RTK initialization time and positional accuracy.
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Acknowledgements
The author would like to acknowledge the GVRD GPS Steering Committee for approving the testing effort, the Base Mapping and Geomatic Service Branch of the B.C. Ministry of Sustainable Resource Management for providing GPS hardware support, the IT Department of the Greater Vancouver Regional District for Internet access support, Henri Ayers of Leica Geosystems for informative discussions, Jeff Chesko of Telus Mobility for providing wireless access support, and Dr. Martin Feuchtwanger of Underhill Geomatics Ltd. for proofreading this paper.