Frequency Hopping Approach Sample Clauses

Frequency Hopping Approach. ‌ MWI involving large inhomogeneous bodies using the inverse scattering technique is highly non-linear. This is because the scattered fields are non-linearly related to the inhomogeneity. The non-linearity is a consequence of multiple scattering [103]. Therefore, as the body becomes large compared to the wavelength or when the contrasts of the inhomogeneity become large, the non-linear effect, or the multiple scattering effect, becomes more pronounced. However, this effect is less pronounced at lower frequencies [105, 129]. Therefore, an inverse problem involving higher contrasts can be solved at lower frequencies. When the frequency becomes higher, the inverse problem increases in non-linearity. An optimisation approach is the robust way of solving the inverse scattering problem. However, due to the non-linearity, the use of single-frequency data at a high frequency often results in the inverse algorithm being trapped in local minima due to the highly non-linear nature of the problem [123].