【摘要】 为获得谐波族信号在水下激发声场的一般规律,采用简正波模型,计算了典型波导中不同声源运动参数时的水下声场,获得了其空间分布、谱分布和多普勒效应数据。结果表明,对于谐波族信号激发的水下声场,声源运动的多普勒效应导致水下声场中信号的频率成分与简正波总阶数相同;水下声场的干涉图像较声源静止时更复杂;基于简正波模型和声线模型的多普勒效应基本一致。该结论可为基于水下声场的空中运动目标检测算法设计提供指导。更多还原

【Abstract】 To drive the common rule for the underwater acoustic field excited by moving source in the air,which radiates sets of harmonic signal,calculations concerning underwater acoustic field in typical waveguide with various motion parameters of moving sources are made by using the normal mode model.Data are also acquired on the spatial distribution, spectrum distribution,and the Doppler effect of the underwater acoustic field.Results show that,for the underwater acoustic field excited by sets of harmonic signal,the Doppler effect induced by moving sources has led to the fact that the total number of lines in the frequency domain of signal from the underwater acoustic field equals to the sum of orders of the normal mode,and the underwater acoustic interference pattern of moving source is much more complex than that of a static source,and the Doppler effect observed in normal mode model is basically the same with that observed in the ray model.These conclusions can serve as guidance to the design of detection algorithm for the moving target in the air based on the underwater acoustic field.更多还原