Based on the Integral Equation Method (IEM), the influence of target curvature on electromagnetic scattering depolarization characteristics is investigated. The studied target is a blunt-nosed cone, whose nose geometry is modeled using three typical surfaces—spherical, ellipsoidal, and parabolic caps—in order to analyze the effect of different curvature distributions on polarization scattering mechanisms. Surface roughness parameters are incorporated into the model, and the depolarization characteristics of various nose geometries are systematically examined under different roughness conditions and incidence angles. Within the IEM framework, both single-scattering and multiple-scattering contributions are taken into account to compute the co-polarized and cross-polarized scattering components, from which the depolarization ratio is obtained.

Numerical simulation results indicate that nose curvature has a significant impact on depolarization characteristics, and this influence exhibits distinct dependence on the incidence angle. Compared with the spherical nose, the ellipsoidal and parabolic noses, due to their continuously varying local curvature, show stronger polarization coupling effects at moderate and large incidence angles. As surface roughness increases, multiple scattering becomes more pronounced, leading to enhanced polarization mixing and a noticeable increase in the depolarization level. These results provide theoretical insight into polarization scattering modeling and depolarization mechanism analysis for complex curved targets.