In 1987 when Discovery Channel's now-famous Shark Week series debuted, researchers had few means of studying the animals beyond underwater cages and crude acoustic tracking devices.
当1987年《探索》频道第一次播出著名的《鲨鱼周》系列时，研究人员还在使用防鲨笼和简陋的声音追踪设备。
Tracking target by using anti-helicopter mine (AHM) is actually the bearing-only measurement because precision of range detected by passive acoustic measurement cant satisfy the need of tracking.
目前被动声探测距离精度还不能满足跟踪的需要，因此，反直升机智能雷对目标的跟踪问题归结为仅有角测量的跟踪问题。
Based upon the influence of a gap on the propagation of the acoustic emission waves, thedesigning of the weld seam tracking system with an acoustic-emission-microcontroller is described.
基于缝隙对声发射波传播有影响的现象，作者研制成一种利用声发射- 微处理器控制的焊缝跟踪系统。
The igniter has the functions of acoustic-optic tracking vehicles, and defending and withdrawing defense of theft prevention of a motor vehicle.
该点火器兼有声光寻车及对机动车防盗进行布防与撤防功能。
Sonar :Technique for detecting and determining the distance and direction of underwater objects by tracking acoustic echoes.
声纳：利用声学方法侦测或测定水下物体的距离和方向的技术。
Sonar :Technique for detecting and determining the distance and direction of underwater objects by tracking acoustic echoes.
声纳：利用声学方法侦测或测定水下物体的距离和方向的技术。
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