Accession Number : ADA183080

Title :   Loran-C Signal Stability Study: West Coast.

Descriptive Note : Final rept.,

Corporate Author : COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT

Personal Author(s) : Taggart,D. S. ; Slagle,D. C.

Report Date : DEC 1986

Pagination or Media Count : 172

Abstract : Since the late 1970's the Coast Guard's Office of Research and Development has been investigating the stability characteristics of Loran-C in the Harbor/Harbor Approach (HHA) environment. This multi-year project, which had its beginnings in the St. Mary's River (a narrow waterway connecting Lake Huron and Lake Superior) has advanced to the point where it is now possible to model the repeatability characteristics on a chain-wide scale using a simple linear model and a finite set of Loran-C data observations. The model, which is called the Uniform Propagation Model, relies on a distance dependent variable (referred to as the Double-Range Difference or simply DRD) for minimization of the error term calculated by subtracting the modeled data from the observed data. The model's performance is improved by barying the weights assigned to various propagation paths. The resulting stability data is presented through the aid of computer generated contour diagrams. This report introduces the results obtained from software developed for this purpose.

Descriptors :   *LORAN, *PROPAGATION, COMPUTERS, CONTOURS, DIAGRAMS, HARBORS, MODELS, LINEAR SYSTEMS, MATHEMATICAL MODELS, STABILITY, SET THEORY, LAKE SUPERIOR, SIGNALS, PATHS, COMPUTER PROGRAMS, WEST(DIRECTION)

Subject Categories : Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE