Frequency function of the coherence of a wave field scattered by a rough surface with a large Rayleigh constant

The problem of finding the frequency function of the coherence of a field scattered by a rough surface with large-scale roughness is considered. A solution is obtained for a three-dimensional case with an account of the finite width of the transceiver antenna directional pattern and intercorrelation of the roughness slope tangents. The frequency coherence function dependence on the surface parameters and sounding conditions at various radar parameters are studied.