January 1970 | NTIA Technical Memo ERL TM ITS 220

Radio navigation coordinate corrections for excess phase accumulation over irregular, inhomogeneous terrain

J. Ralph Johler; Duane C. Hyovalti

Abstract: This report reviews the techniques for calculating position with the Loran navigation system, including the use of phase correction factors computed for ground wave propagation over a smooth spherical earth. If the earth is rough or inhomogeneous, there may be an excess phase accumulation over that for a smooth earth. Some time-difference calculations for 100 kHz propagation over a perfectly-conducting surface with a uniform distribution of finitely-conducting, hemispherical, bosses show large but physically possible excess phase accumulations. A computer program to calculate time differences, gradients, latitude, longitude, and distances along a geodetic line is listed. Sample input and output are included.

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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