前言 近代世界各国研制和建造的各种类型舰艇,就吨位而言,从几百吨的猎潜艇至千吨以上的护卫舰、驱逐舰,甚至更大的舰,无一不安装声纳,声纳可以说是现代化舰艇上警戒水下潜艇的耳目。它在性能上不仅可以测定水下潜艇的方位,距离,而且还可以根据测得的运动要素,自动计算对潜艇攻击的诸元,对目标自动跟踪。在大多数舰艇上装有反潜指挥仪以后, Foreword Various types of ships developed and constructed in various countries of the world in modern times, in terms of tonnage, ranging from hundreds of tons of submarines to over one thousand tons of frigates, destroyers, and even larger ships, are installed with sonar and sonar Said to be on the modern naval underwater warning submarine. It can not only measure the performance of underwater submarine orientation, distance, but also can be based on measured elements of motion, automatically calculate the submarine attack of the elements, the target automatically track. After most ships are equipped with anti-submarine conductors,