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.
震耳欲聋的直升机螺旋桨声简直让人发疯。
The deafening whirr of helicopter simple drives people crazy.
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.
应用推荐