时域混叠消除的空中声源激发水下声场的研究

Research on underwater acoustic field stimulated by airborne source based on aliasing elimination in time domain

对空中声源激发水下声场的空间分布进行研究,从波动理论入手,针对FFP算法在低采样率可能出现的声压混叠现象,提出了一种基于时域局部窗口滤波的算法。该方法根据混叠区域附近声压值变化较剧烈的特点,通过设定参考值,对目标声压值进行合理预测。仿真结果表明:该算法能够有效的恢复混叠区域的声压值,同时对正常区域声压值予以保留。

Research is made on spatial distribution of underwater sound field stimulated by airborne source. Based on the wave theory and aiming at the sound pressure aliasing resulting from low sampling rate of FFP, a new algorithm with local window of time domain filtering is proposed. According to the dramatic sound pressure changes in aliasing area, the sound pressure value can be predicted reasonably by setting a threshold value. The simulation results show that this algorithm can restore aliasing regional pressure value and retain the normal sound pressure value.