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

Figure 13

For the two-variable case, the minimum number of observations is used. The observations are closely spaced in frequency producing nonunique inversion results. Parameters: 𝜃_𝑖=40deg, amplitude = 3cm, 𝑙=20cm, 𝜖_𝑟1=5.5+.3𝑖, and 𝜎_rms=7cm. Observation channels: 𝑓₁=120MHz, 𝑓₂=150MHz.