HOW TO HARVEST THE FULL POTENTIAL OF LORAN-C

L. F. Fehlner and T. A. McCarty

Peer Reviewed

Abstract:	This paper describes the potential of Loran-C for providing precision navigation and time service. It also touches on the improvements required in user equipment to exploit this potential. With improved transmitters and improved receivers, taken together, a single fix accuracy can be expected to be less than 14 meters, CEP; the 14 meter value occurring at the outer fringes of the service area (about 1400 kilometers from the farthest transmitter). The improvements required of the transmitters are (1) accurate control of the transmitted wave form, and (2) accurate control of the time of occurrence of the zero crossings of the carrier. Improvements required. of the receivers involve (1) more thorough rejection of noise, (2) increase in internal precision, (3) lower probability of false cycle identification, and (4) implementation of the group/phase velocity technique of distance measuring. Loran-C service can include distribution of epoch time to stationary users with an accuracy of 2 microseconds; and to moving users with an accuracy of 5 microseconds (both 3 standard deviations).
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 21, Number 3
Pages:	223 - 233
Cite this article:	Fehlner, L. F., McCarty, T. A., "HOW TO HARVEST THE FULL POTENTIAL OF LORAN-C", NAVIGATION: Journal of The Institute of Navigation, Vol. 21, No. 3, Fall 1974, pp. 223-233.
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