他试图睡觉，但得到的是整夜的迫击炮和直升机声。
He tries to sleep but gets woken by mortars and helicopters all night long.
在对直升机声信号特征进行分析之后，提出了一种基于谐波恢复的ESPRIT方法来提取直升机声信号谐波频率作为特征用以识别直升机声目标。
Based on analysis of spectral characteristic of helicopter acoustic signal, a method of extracting harmonic frequencies from the helicopter acoustic signal via ESPRIT is proposed.
Sara对机上人员大声叫喊，以盖过直升机机翼的旋转声，“他失了很多血，低血容量性休克！”
Sara shouts over the sound of the whirling chopper blades, “He’s lost a lot of blood.
地震一直在持续，昨晚大概每15分钟就有一次。不断地有警报声，直升机也频繁地从头顶飞过。
Quakes keep coming. Last night they struck about every 15 minutes. Sirens are constant and helicopters pass overhead often.
利用简易被动声传感器阵列进行直升机目标定位。
A simple practical implementation of positioning system with passive acoustic sensor arrays for localizing helicopter was presented.
利用简易被动声传感器阵列进行直升机目标定位。
A simple practical implementation of positioning system with passive acoustic sensor arrays for localizing helicopter was presented.
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