摘要
提出一种水下检测空中高速运动声源的方法。采用波数积分方法对空气中运动声源激发的水下声场进行建模,仿真分析了水下接收信号的时域波形。并利用信号的时频域临近连续性和高阶谱抑制高斯噪声的特点,以信号的双谱替换DFT得到双谱幂次检测器,利用该检测器在高斯背景下检测空中声源水下噪声。仿真和实测数据处理结果表明,所提出的方法切实可行。
An underwater detection method for rapidly moving acoustic source in air was proposed. A underwater acoustic field excited with a rapidly moving acoustic source in air was modelled by a wavenumber integration method, and time domain waveform of the underwater received temporal signal was simulated and analyzed. The underwater noise of acoustic source in air is detected by the detector, which is obtained with bispectrum replacing discrete Fourier transformation of the signal, based on signal contiguity in time-frequency domain and characteristic of higher order spectrum inhibiting Gaussian noise. Results of the simulated and the processed in true data show that the proposed method is feasible.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2010年第3期291-296,共6页
Acta Armamentarii
基金
国家自然科学基金资助项目(60572161
60672140)
泰山学者建设工程专项经费资助
关键词
声学
水声对抗
水声信号检测
运动声源
声场建模
acoustics
underwater countermeasure
underwater acoustic signal detection
moving sound source
sound field modeling
