空气中声源激发的浅海水下声场传播实验研究

为了了解空气中声源激发的水下声场传播特性,对此开展实验研究。2010年在南海北部海域进行了一次空气中声源激发水下声场实验,在水下成功地接收到远至4km处大功率扬声器在空中发射的脉冲声信号。本文通过分析实验数据,研究空气中声源激发的浅海水下声场传播特点。针对接收阵拾取的声传播信号信噪比低的特点,综合利用脉冲压缩以及波束形成方法提高接收信号的信噪比,得到收发距离1~4km、频率200~1000Hz范围内的传播损失实验值。在理论上,采用波数积分方法进行了声场数据模拟,结果表明理论计算的传播损失与实验结果较为一致。

An experimental research on air-to-water sound transmission in shallow water

In order to learn the air-to-water sound transmission characteristic in shallow water, an experiment was conducted in South China Sea in July 2010. During the experiment, sound pulses sent by a loudspeaker hung on a ship were received by an underwater HLA. The distances between the loudspeaker and the HLA were from 1 km to 4 km. The pulse compression and conventional beam forming are used to increase the signal-noise-ratio. And the air-to-water sound wave transmission loss at the frequencies from 200 Hz to 1000 Hz is estimated. The transmission loss calculated by a wave number integration model is also provided, which is in well agreement with the experimental data.