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2009年6月在南海北部进行了一次海洋环境和声学同步观测实验.实验观测到内波活动导致水体声速剖面随时间和空间起伏.从温度链长期观测数据提取出声速剖面经验正交函数(EOF).数值仿真研究了水平变化海洋环境下平均声速剖面的声学反演,结果表明,反演结果与传播路径上的平均声速剖面具有很好的一致性.在此基础上,利用实验中垂直接收阵记录的宽带爆炸声源信号反演海水声速剖面,并与实验测量声速剖面进行比较,验证了匹配场声学反演海水声速剖面的有效性和稳定性.
A marine environmental and acoustic synchronous observation experiment was conducted in the northern South China Sea in June 2009. Experiments show that the internal acoustic wave activity causes the water body sound velocity profile to fluctuate with time and space.The empirical orthogonal function of the sound velocity profile is extracted from long-term temperature chain data EOF) .Numerical simulation has been carried out to study the acoustic inversion of average sound velocity profile in a horizontal ocean environment. The results show that the inversion results are in good agreement with the average sound velocity profile in the propagation path. Based on this, The acoustic velocity profiles of seawater were retrieved by broadband explosion source signals recorded by receiver array and compared with the measured sound velocity profiles to verify the validity and stability of the acoustic field velocity profiles.