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- W1653367219 abstract "Abstract : Developing a highly accurate method of predicting the arrival time of a LORAN pulse traveling as a ground wave, this report considers the one dimensional integral-equation method of analyzing propagation over irregular terrain. Numerical calculations and theoretical developments demonstrate how topography and various approximations affect the calculated propagation of a ground wave. We find that curvature effects entering through geometric terms of the integral equation for the propagation of phase work strongly, but that those entering through a modified impedance condition are insignificant. Dispersion of the pulse can cause cycle ambiguity in the signal. For a ground conductivity of 0.001 mho/m, cycle ambiguity appears at a distance from the transmitter of roughly 1500 km. Extensive numerical results are presented for generic terrain types selected to illustrate salient features of solutions to the integral wave equation. Results for simple hills show that arc-length correction of the propagation path is insignificant compared with geometric effects on phase speed in predicting phase retardation. Isolated terrain features cause large local perturbations in phase arrival; far beyond the irregularity on the propagation path, effects are observable but diminish with distance. The one dimensional version of the integral wave equation can over state the effect of terrain features that are localized in the direction transverse to the great-circle propagation path. (Author)" @default.
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- W1653367219 date "1980-11-01" @default.
- W1653367219 modified "2023-09-27" @default.
- W1653367219 title "An Integral Equation Approach to the Propagation of Low-Frequency Ground Waves Over Irregular Terrain: 1. Ground-Based Terminals." @default.
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