Abstract
During the Fall of 1984 A/S Kongsberg Vaapenfabrikk (Kongsberg) started a project to investigate the improvement which could be obtained if GPS was used in differential mode. One of the main elements 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, 1 meter accuracy was obtained with standard deviation less than 2 meters. This was obtained with baselines up to 570 km. Even large errors in one satellite were properly accounted for. Based upon the results of this feasibility study, a project was started. The aim was to develop a real time differential GPS system by the Spring of 1986, based on a GPS receiver developed by Kongsberg. The carrier of the differential message is the Consol navigation system. Consol has been closed down as a navigation system in Northern Norway. The frequency (320 KHz) and the transmitter will be used for the differential GPS-system. The Consol system has a range capability of approximately 1000 km from the reference station. The primary user of the differential system will be the oil industry, having a high level of activity in Northern Norway as well as a requirement for high accuracy.
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