How to solve inverse scattering problems without knowing the source term: A three-step strategy

The solution of inverse scattering problems always presupposed knowledge of the incident wavefield and require repeated computations of the forward problem*for which knowing the source term is crucial. Here we present a three-step strategy to solve inverse scattering problems when the time signature of the source is unknown. The proposed strategy combines three recent techniques: (i) wave splitting to retrieve the incident and the scattered wavefields*(ii) time-reversed absorbing conditions (TRAC) for redatuming the data inside the computational domain*(iii) adaptive eigenspace inversion (AEI) to solve the inverse problem. Numerical results illustrate step-by-step the feasibility of the proposed strategy.