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MH370航班失联以来,随着时间流逝,水面搜索尚无所获,搜救的重点转向了海底。为此,美国派出拖拽式声呐和无人潜水器找寻黑匣子,声呐也因此成为备受关注的关键词声呐是利用水中声波进行探测、定位和通信的电子设备。由于电磁波在水中衰减的速率非常高,无法侦测出讯号来源,以声波探测水面下的人造物体成为运用最广泛的手段。潜艇可以通过主动声呐的声音回波进行搜索和导航。早在1970年代,美国和前苏联海军就使用核动力潜艇,通过主动声呐对北极地区水下地形进行了测绘。
With the passage of time on the MH370 flight, no surface search has been made over time, and the focus of search and rescue has shifted to the sea floor. To this end, the United States sent a drag-type sonar and unmanned submersible to find the black box, sonar has therefore become a key concern Sonar is the use of sound waves in water to detect, locate and communicate electronic equipment. Due to the high rate of attenuation of electromagnetic waves in water and the inability to detect the source of the signal, it has become the most widely used means of detecting man-made objects underwater by sound waves. Submarines can search and navigate through active sonar acoustic echoes. As early as the 1970s, the United States and the former Soviet Navy used nuclear-powered submarines to map underwater polar terrain in the Arctic through active sonar.