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

Figure 11

Even though two observations are used, the observations are closely spaced (in frequency) resulting in limited improvement in the quality of the inversion. Parameters: 𝜃_𝑖=40deg, amplitude = 3cm, 𝑙=20cm, 𝜖_𝑟1=5.5+.3𝑖, 𝜎_rms=7cm, H₂O frac. =  .15. Observation channels: 𝑓₁=120MHz, 𝑓₂=150MHz.