Integrated GPS/LORAN, Structures and Issues

Benjamin Peterson, Richard Hartnett, Dean Bruckner, and Rebecca Heatherington, Ralf Fiedler

Abstract:	The need for integrating GPS and LORAN-C (hereafter simply termed LORAN) is summarized. Assuming for discussion that LORAN is extended beyond the year 2000 and that it serves as a backup for GPS, two scenarios for this new role of LORAN are presented. Based on these scenarios, goals for improving LORAN to fill this new role are outlined. Beginning with a comparison of existing accuracies of GPS and LORAN, two Kalman-filter based integrated receiver structures are developed to exploit the advantages of both systems. Results of a proof-of-concept receiver in a fixed location, in a minivan on the highway, and aboard a Coast Guard vessel show significant improvement in both accuracy and availability. A newer receiver architecture is summarized. Finally, we revisit improvements to LORAN to serve as a better backup for GPS. For operations where ASF values are not constant, high accuracy will require better propagation models or differential corrections. In addition, improved receiver technology such as master-independent multi-chain operation is discussed with and without precise time from GPS for acquiring and identifying LORAN signals.
Published in:	Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998) June 1 - 3, 1998 The Adams Mark Hotel Denver, CO
Pages:	363 - 372
Cite this article:	Peterson, Benjamin, Hartnett, Richard, Bruckner, Dean, Heatherington, Rebecca, Fiedler, Ralf, "Integrated GPS/LORAN, Structures and Issues," Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998), Denver, CO, June 1998, pp. 363-372.
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