Omega/VLF Signal Coverage Prediction

Jerry A. Ferguson

Abstract:	This paper describes some applications of the long wavelength propagation capability of the Naval Ocean Systems Center to OMEGA propagation. The propagation prediction capability applies the concept of the earth-ionosphere waveguide to very low frequency (vlf: 10 kHz to 30 kHz) and low frequency (If: 30 kHz to 100 kHz) radio propagation. It is used to perform assessment of communications coverage at long wavelengths via graphical displays of signal strength and signal to noise over individual propagation paths and over large geographical areas. The automation of the calculations depends on accurate specification of the parameters of the earth-ionosphere waveguide. The driver program contains models for these parameters which have been developed over a number of years. The model of the ionosphere is an approximate one which characterizes the conductivity as an exponentially increasing function of height. Some allowance for the nighttime differences between temperate and polar latitudes is made. The lower boundary of the waveguide is defined by a detailed ground conductivity map based on geological formations.
Published in:	Proceedings of the 1990 National Technical Meeting of The Institute of Navigation January 23 - 25, 1990 Princess Resort Hotel San Diego, CA
Pages:	119 - 125
Cite this article:	Ferguson, Jerry A., "Omega/VLF Signal Coverage Prediction," Proceedings of the 1990 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1990, pp. 119-125.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In