Retrieval of Parameters for Three-Layer Media with Nonsmooth Interfaces for Subsurface Remote Sensing

Figure 5

Error in RCS as a function of layer separation. At low frequencies and low losses below the first interface errors from ignoring the subsurface can be significant. The error variation with the depth of the 2nd interface clearly displays underdamped characteristics. Simulation parameters: frequency = 150 MHz, amplitude = 3.5 cm, period = 2 m, 𝜖_𝑟1=5.5+𝑖, 𝜖_𝑟2=35+2𝑖, 𝜎_rms1=2cm, 𝑙₁=20cm, 𝜎_rms2=5cm, and 𝑙₂=20cm.