Analysis on the influence of two-layer rough interface on the echo characteristics of buried rectangular target in composite electromagnetic scattering

In order to analyze the influence of scattering from two layer underground rough surfaces on the echo of buried target, a finite-difference time-domain calculation model for ground penetrating radar detection of two media rough surfaces and a rectangular target is established. The composite scattering echoes of two rough interfaces with a rectangular target at different root mean square heights and different correlation lengths are calculated respectively. The influence of two-layer rough surface scattering on target echo is discussed and analyzed, as well as the effect of roughness parameter root mean square height and correlation length on target echo shape.