Resistive treatment of edges in numerical LGA scattering from rough surfaces

Calculations show that the resistive taper is effective in treating the edges of the scattering surface under the conditions considered. The taper is effective at both vertical and horizontal polarizations, and can be used when the surface is an impedance boundary representing a large but finite conductivity surface. The Taylor-weighting taper of Haupt and Liepa (1987) is more effective than a simple power-law taper, particularly in cases of low scattering cross-sections. Because the taper length must be increased as the illumination angle approaches grazing along the planar section of surface on which the loading is applied, this approach is best suited to surfaces such as these where the end section can be tilted away from horizontal without significantly affecting the dominant scattering mechanisms.