Abstract
A method of detecting targets present in the shadow area of an obstacle like a seamount by applying a time reversal is described. Transmission signals of two types with a different phase are used. First, the signal of a normal phase is transmitted in the propagation environment without a target, and the signal received with each element of a transducer array is preserved. Next, the signal of an anti-phase is transmitted in the propagation environment with the target, and the signals received with each element of the transducer array are preserved. The received signals of two types are added in the vector. The time reversal sound field (TRSF) to the target is formed by time-reversing and re-emitting the added signal.
