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A Hybrid Structural Constraint Approach for Enhancing Electromagnetic Inversion through Acoustic Inversion

To take the advantages of the high resolution of acoustic inversion and the high contrast of electromagnetic (EM) inversion, a joint inversion method, named a hybrid structural constraint approach (HSCA), based on the subspace-based optimization method (SOM) is proposed, which enhances EM inversion through acoustic inversion. In this method, acoustic inversion is firstly carried out to obtain a high-resolution result. Then, the scatterers are distinguished from the background by Markov random field (MRF) method. The EM inversion is only executed in the scatterers domain and constrained by the cross-gradient function. Numerical examples validate that HSCA-SOM can obtain an EM inversion result with much higher resolution and less computation cost than other similar joint inversion methods.