The mechanism of the produce of target noise, 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。

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The system of passive ranging SONAR makes use of the target noise 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。

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Choose the target and the noise that will be removed in two Windows, then extract target with dual-direction scan in each window.

在二值边缘图像中应用双窗口分别选定目标和要去除的噪声，在各窗口中采用双向扫描提取目标特征。

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Building social impact campaigns that reach target audiences in the sea of online noise generated by Facebook and Twitter can be daunting.

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Nokia have made noise with new smartphone models that will target the entry level smartphone market, particularly in the emerging markets.

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