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Abstract. 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.
Hou et al. (Thu,) studied this question.