Document Type
Conference Proceeding
Publication Date
2003
Department
Marine Science
Abstract
The Global Positioning System (GPS) has been used for marine navigation and hydrographic surveying for the last decade. A number of GPS augmentation systems have been proposed and/or developed for different applications in various regions. Two services, the NavCom Technology Inc. RTG / C&C Technologies Inc. C-Nav and the Fugro Chance StarFix HP, were examined in this study, as they are new, high-accuracy marine products. Our primary goal was to evaluate how each system performs, rather than to compare and contrast them.
Both systems operate in basically the same manner, with a dual-frequency GPS receiver and satellite augmentation signal antenna and demodulator. However, the corrections generated by the services and the application of those corrections is quite different. The static and kinematic tests carried-out in this study are described and explained, along with the analysis and evaluation procedures developed. Testing results showed that both systems produced near-decimeter level results (1σ) and few-decimeter results (95%) under ideal conditions. However, periods of poorer results were observed and attempts were made to explain solution outliers by correlating them with such effects as atmospheric activity. Both systems generally provided stable and accurate solutions under certain conditions. USM plans to expand these investigations to further test these and other systems. The ultimate goal is to develop a generic set of testing and evaluate procedures, and to provide assessments to the user and supplier communities
Recommended Citation
C-Nav (2003). http://www.cctechnol.com/product.php?id=5 . Accessed February 2003. Fugro Chance (2003). http://www.fugrochance.com/welcome.html . Accessed February 2003. Hatch, R., T. Sharpe, P. Galyean (2003). A global, high-accuracy, differential GPS system. Proceedings of the Institute of Navigation National Technical Meeting, 22-24 January, Anaheim, California, USA, in press. Lapucha, D. R. Barker, L. Ott, T.E. Melgård, O. Ørpen, and H. Zwaan (2001). Decimeter-level real-time carrier phase positioning using satellite link. Proceedings of the Institute of Navigation International Technical Meeting, ION GPS 2001, 11-14 September, Salt Lake City, Utah, USA, pp. 1624-1630. Witzleb, R. (2003). A qualitative analysis of the effects of weather frontal activity on the vertical position accuracy of the C-Nav GPS receiver. Hydrographic Science term report, Department of Marine Science, The University of Southern Mississippi, 15 pp.