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Integrated GPS/LORAN: Structures and Issues*

1998; Wiley; Volume: 45; Issue: 3 Linguagem: Inglês

10.1002/j.2161-4296.1998.tb02381.x

2161-4296

Benjamin Peterson, Richard J. Hartnett, Dean Bruckner, REBECCA HEATHERINGTON, Ralf Fiedler,

Maritime Navigation and Safety

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 C/A-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 (ASF) 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.