The mechanism of the produce of targetnoise, its transmission characteristics in air and several main factors that influence the sound transmission are analyzed.
分析了低空目标声源的产生机理、目标辐射噪声在大气中的传播特性以及影响其传播的几个主要因素。
2
The system of passive ranging SONAR makes use of the targetnoise received by the equipment which converts energy from one form to another to estimate the target distance.
被动测距声纳系统是利用换能器基阵接收的目标辐射（噪声）信号来估计目标距离。
3
The US did begin to engage, but only to make more noise in the negotiations, dampening hopes for a US emissions reduction target.