Using GPS to Calibrate Loran-C

Joseph J. Pisano, Per K. Enge, Peter L. Levin

Abstract:	Loran-C is a radionavigation system which uses groundwave signals emitted from a network of synchronized terrestrial transmitters. With repeatable accuracy measured in tens of meters, Loran provides excellent service to users navigating relative to landmarks which have been previously marked using Loran-C. However, its absolute (or geodetic) accuracy is currently limited to approximately one-quarter nautical mile (460 meters) by uncertainties in the groundwave propagation speed. Fortunately, the Global Positioning System (GPS) can be used as a very accurate and convenient truth system to calibrate these uncertainties, which are known as additional secondary phase factors (or ASFs). This paper develops an algorithm for such calibration and applies this algorithm to a set of GPS/Loran measurements taken in the Gulf of Maine.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	207 - 216
Cite this article:	Pisano, Joseph J., Enge, Per K., Levin, Peter L., "Using GPS to Calibrate Loran-C," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 207-216.
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