Dj. Donohue et al., APPLICATION OF ITERATIVE MOMENT-METHOD SOLUTIONS TO OCEAN SURFACE RADAR SCATTERING, IEEE transactions on antennas and propagation, 46(1), 1998, pp. 121-132
Numerical methods such as the banded matrix iterative approach (BMIA)
represent a major advance in the direct numerical simulation of rough
surface-wave scattering, This paper considers the application of itera
tive methods such as the BMIA to ocean-radar scattering, It is shown t
hat for typical microwave radar frequencies and sea-surface roughness,
the BMIA is actually of limited use, A more general iterative solutio
n based on a multigrid decomposition and the generalized conjugate res
idual (GCR) method, is thus developed. The multigrid approach is ideal
ly suited to the broad-band ocean surface, as it solves the scattering
problem on a sequence of grids, each corresponding to a different ran
ge of spatial frequencies or length scales, This approach is applied h
ere to several sea scattering problems, including very low grazing ang
les and both horizontal and vertical polarization, Good agreement is o
btained with perturbation theory in the appropriate limits and several
qualitative characteristics of radar backscatter data are reproduced.