声纳系统的，是了解声纳系统的好资料。包括信号处理等各个环节。-Sonar systems, sonar systems are well know information. Including signal processing and other aspect.

三维圆环阵波束图，对学习雷达声纳信号方面的同学很有帮助-3D ring array beam pattern, helpful to students learning radar sonar signal! ! ! ! ! !