【摘要】 小型化水下无人平台因尺寸限制难以搭载阵列,导致其水声目标波达方向估计(DOA)能力受限。本文利用穿孔板不同尺寸参数具有不同吸声性质的特点,提出了一种基于声学超材料的单水听器解决方案。设计了一个各方向尺寸参数随机变化的声学超材料外壳,通过构造方向各异的频率特性实现对不同方向水声信号的频率调制。在此基础上,设计了通信感知一体化波形,构建了声学超材料辅助的单水听器DOA定位模型,并在通信感知一体化框架下设计了水声调制解调方法。水池实验结果表明,所设计的声学超材料外壳可在通感一体框架下实现单水听器DOA估计及可靠水声通信。更多还原

【Abstract】 The small-sized underwater unmanned platforms have limited underwater acoustic target direction of arrival(DOA)estimation capability due to size constraints which make array mounting difficult. This paper proposes a single hydrophone solution based on acoustic metamaterials by leveraging the characteristic that perforated plates exhibit distinct sound absorption properties with different dimensional parameters. An acoustic metamaterial shell with randomly varying dimensional parameters in all directions is designed. Frequency modulation of underwater acoustic signals from different directions is achieved by constructing frequency characteristics that differ with directions. On this basis, a communication-perception-integrated waveform is designed. An acoustic metamaterial-assisted single hydrophone DOA localization model is constructed. An underwater acoustic modulation and demodulation method is developed under the communication-perception-integrated framework. Pool experiments demonstrate that the designed acoustic metamaterial shell can realize single hydrophone DOA estimation and reliable underwater acoustic communication under this framework.更多还原