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

Figure 12

Two observations separated in frequency are used to produce nearly perfect results. Parameters: 𝜃_𝑖=40deg, amplitude = 3cm, 𝑙=20cm, 𝜖_𝑟1=5.5+.3𝑖, 𝜎_rms=7cm, and H₂O frac. =  .15. Observation channels: 𝑓₁=120MHz and 𝑓₂=460MHz.