3、Academy, Qingdao 266100, China)Abstract: When the sound source is located near the surface in the deep ocean, there will be strong caustics conver-gence zone far away from the sound source. In modern underwater acoustic technology applicationwe can use the underwa-ter channels converge
4、nce zone to achieve the goal of long-range detection of target in the deep ocean. In this paper, we ana-lysis the formation conditions of convergence zones and the target relative sound intensity characteristic in convergencezones, the results shows: only when the minimum speed of soun
5、d exist and the exit angle of ray satisfies certain conditionscan there be a convergence zone effect. Relative sound intensity level distribution has a bimodal structure in the convergencezone. When the receiving depth and the target depth are of the same, the relative sound intensity
6、peak appears, and thisprovides a method for determining the depth of the deep target.Keywords: deep sea convergence zone；relative sound intensity；target depth0 引言聚区目标相对强度的特征研究还较少。本文分析深海会聚区的形成条件，为充分利用会与表面声道相比，深海声道（SOFAR）受季节变聚区效应实行远程探测提供了基础，同时研究一定深化的影响较小，声道效应更加趋于稳定[1]。深海中当度目标的相对强度在会聚
