May 1975 | NTIA Technical Report OT Report 75-62

Numerical Mapping Methods to Reduce OMEGA Propagation Correction Tabulations

Frank G. Stewart; Larry R. Teters; L. Roger Espeland

Abstract: This report is a study of the feasibility of applying numerical mapping techniques to the storage and handling of OMEGA propagation corrections. Using the techniques discussed in the report, it is possible to represent the 110,592 propagation corection values of a representative area with 1377 coefficients. These coefficients, not necessarily an optimum set, can be used to determine the entire set of correction values for the area. The range of maximum residuals between the observed and fitted corrections values was 2 to 20 cecs and the RMS residuals ranged from 1 to 5 cecs. A synthesis program and the coefficients for the test area are included in the appendix.

Keywords: OMEGA; co-channel interference; numerical mapping; OMEGA navigation; propagation corrections; coefficients; centicyles (cecs); maximum residuals; RMS residuals

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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