湛蓝的海水下,一艘艘潜艇像巨鲸一样在“龙宫”中逡巡游弋.它们施展了什么法术能够做到神出鬼没,悄无声息,瞒天过海呢?原来,这些“水下幽灵”巧妙运用了高科技的“隐身术”——反声呐技术.现代声呐可分为被动式声呐和主动式声呐两大类.被动式声呐隐蔽性好,识别目标能力强,但不能侦察静止目标.主动式声呐可以解决这一问题,它主动向水中发射声波,接收水下物体的回声,从而发现目标并测量其参 Under the blue sea, a submarine cruises like a whale in the “Dragon Palace.” What magic spells do they show their magic, silently and unconsciously? The original “underwater ghost” Clever use of high-tech Stealth sonar can be divided into passive sonar and active sonar two categories. Passive sonar hiding, recognition of the target ability, but can not detect stationary targets. An active sonar solves this problem by actively launching acoustic waves into the water, receiving the echoes of underwater objects, finding targets and measuring their ginseng