Target detection under influence of sound wave scatterers using time reversal.

Abstract

In general, it is difficult to detect the forward scattering wave from the target located between the sound source and the array. In a word, because the sound wave from the sound source is strong, the forward scattering wave from the target cannot be isolated. Moreover, when the sound wave scatterers except the target exist, the scattered sound wave acts mutually, and the target cannot be isolated. Therefore, the propagation environment is divided into the reference sound field without the target and the target sound field including the target. Next, the forward scattering wave from the target is extracted by using the signal obtained in each sound field. The time-reversal processing was performed to the extracted scattered wave, and the target position was obtained. As a result, the forward scattering wave was extracted by selecting the referring sound field and the target sound field, and the position of the target could be obtained in the environment that scatterers except target influenced. To establish this method, it is necessary to confirm that the propagation environment retains the phase conjugate.