Field strength forecasting with the parabolic equation: wideband applications

The desire to make field strength predictions for the more complex structures that give rise to surface and elevated ducts (such as coastal advection and subsidence inversions) has led to a renewal of interest in an alternative full-wave method of solving Maxwell´s equations-the parabolic equation method. Although introduced into radiowave propagation by Leontovich and Fock (1946), it was not pursued due to a lack of suitable numerical methods of solving the equation at that time. Recent advances in an analogous problem in underwater acoustics have led to the development of a powerful, general, numerically efficient method for radiowave propagation