A Direct Imaging Algorithm For Extended Targets

"A Direct Imaging Algorithm For Extended Targets"

We present a direct imaging algorithm for extended targets. The algorithm is based on a physical factorization of the response matrix of a transducer array and the Multi-Signal Classification (MUSIC) imaging function is used to visualize the results. A resolution and noise level based thresholding strategy is developed for regularization. The algorithm is simple and efficient since no forward solver or iteration is needed. Multiple-frequency information improves both resolution and stability of the algorithm. Efficiency and robustness of the algorithm with respect to measurement noise and random medium fluctuations are demonstrated.