Diffstar: A Concept for Differential GPS in Nothern Norway

Hermod Fjereide

Abstract: During the Fall of 1984, A/S Kongsberg Vaapenfabrikk (KONGSBERG) started a project on investigating the improvement which could be obtained if GPS was used in differential mode. One of the main parts of the project was a field test employing two GPS receivers collecting data for post-processing. The reference receiver was placed at a well established geodetic reference point in Central Norway, while the other receiver was moved to several places where known geodetic points existed. The results of the data analysis were very promising. When averaging over a period of some 30 minutes, results of meter accuracy was obtained with standard deviation less than 2 meters. This was obtained with baselines up to 570 k.m. Even large errors in one satellite were taken properly care of. Based upon the results of this feasibility study, a project was started. The aim was to develop a real time differential GPS system on the air by Spring 1986. The system is based upon KONGSBERG' s own developed GPS receiver. The carrier of the differential message is the Consol navigation system. Consol has been closed down as a navigation system in Nothern Norway. The frequency ( 320 KHz) and the transmitter will be used for the differential GPS-system. The Consol system has a range capability of approx. 1000 k.m from the reference station. The primary users of the differential system will be the oil industry having a high level of activities in Northern Norway as well as a requirement of high accuracy.
Published in: Proceedings of the 42nd Annual Meeting of The Institute of Navigation (1986)
June 24 - 26, 1986
Seattle, Washington
Pages: 125 - 130
Cite this article: Fjereide, Hermod, "Diffstar: A Concept for Differential GPS in Nothern Norway," Proceedings of the 42nd Annual Meeting of The Institute of Navigation (1986), Seattle, Washington, June 1986, pp. 125-130.
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