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

Peer Reviewed

Abstract: This paper summarizes the need for integrating GPS and LORAN-C (hereafter simply termed LORAN). Assuming that LORAN increasingly serves as a backup for GPS in the next 10 years, two scenarios for this new role of LORAN are presented. Improvements to LORAN for this new role are then outlined. Beginning with a comparison of existing accuracies of CIA-code 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. Improvements to LORAN to make it a better backup for GPS are revisited. Where additional secondary factor &SF) values are not constant, high accuracy requires better propagation models or differential corrections. In addition, improved receiver technologies such as master-independent multichain operation are discussed.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 45, Number 3
Pages: 183 - 194
Cite this article: Peterson, Benjamin, Hartnett, Richard, Bruckner, Dean, Heatherington, Rebecca, Fiedler, Ralf, "INTEGRATED GPS/LORAN: STRUCTURES AND ISSUES", NAVIGATION: Journal of The Institute of Navigation, Vol. 45, No. 3, Fall 1998, pp. 183-194.
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