ACOUSTIC-WAVES FOCALIZATION FOR AN ANTENN A IN STRATIFIED MEDIA WITH MULTIPLE REFLECTIONS

An acoustic field model through the sediment in slight depth is presen ted. The method is based on the stratification of homogeneous media to simulate the geoacoustic properties in sediment environment. The acou stic field model is calculated from an acoustic array antenna which us es focalization for transmission and reception. The beam wave model in cludes the direct ray and all reflexion rays. Different studies in str atified media solved this problem by using a matrix formalism [1] or a finite difference method. Here we use a binary algorithm. In a preced ing study [2], we have valided the antenna model with experimental dat a in the simple case of water. The results are presented for two posit ions of antenna and for two sediments. The map pictures obtained are i n good agreement with the physical phenomenom.