sound ranging

1. Sonic-Density-Neutron logging suite borehole televisor sound operation navigation and ranging
   声波-密度-中子测井系列
2. The Operational Effectiveness Analysis of the Artillery Locating Radar and Sound Ranging Networking System based on SEA
   基于SEA的炮兵声测和雷达组网的作战效能分析
3. The anti-artillery reconnaissance is an important duty of artillery reconnaissance, the artillery locating radar and sound ranging are main equipments of anti-artillery reconnaissance.
   反炮兵侦察是炮兵侦察的一项重要任务，声测和雷达是反炮兵侦察的主要装备。
4. Presented in this paper is an experimental study of measurements of the bottom reflection loss by means of explosive sound sources in shallow sea regions with depths ranging from 40 to 90 metres and sediments of different types.
   本文介绍在水深40&90米的浅海海域中三种类型沉积层海底上，用爆炸声源进行的海底反射损失的实验研究结果。
5. The speed of sound in seawater is one of the important parameters during the measurement of the underwater ultrasonic ranging and positioning, testing and monitoring the marine environment and so on. The propagation speed with the water temperature, pressure and salinity varies.
   海水声速是进行水下超声波测距与定位、探伤及海洋环境监测等测量过程中的重要参数之一，它随海水温度、压力及盐度等的差异而变化。

noun

1. locating a source of sound (as an enemy gun) by measurements of the time the sound arrives at microphones in known positions