Application of Invariant Imbedding Method to Simulate Numerically Beyond-the-Horizon Propagation of SHF Over the Sea

Abstract

The present paper studies beyond-the-horizon propagation of SHF in an evaporation duct in the presence of strong anisotropic fluctuations of the refractivity index. An effective technique to obtain numerically complex constants of propagation is suggested. On the basis of this approach, the modelling method of SHF propagation in media with layer fluctuations of refractivity index is formed. Finally, the paper considers some examples of the influence of fluctuations on beyond-the-horizon propagation. A generalization of the adiabatic approximation for opening systems with a complex spectrum of eigenvalues and indefinite eigenfunctions is suggested. On this basis of the rough solution obtained for the atmosphere with nonuniformity in the horizontal direction is revised. The mechanism of exiting the evaporation duct by the high-located SHF source is also discussed.