摘要
浅海海底声参数是影响声场传播的重要参量。文中根据信号的相位特性对反演稳定性的影响进行了数值模拟;并于2002年8月在黄海海区进行了海底声参数反演实验。利用垂直入射脉冲和海底回波数据进行海底声参数反演,由于海底回波信号随穿透深度增加而导致回波信号的信噪比降低,为了有效地增加海底声阻抗反演深度,提出平滑分段抽取冲激响应,重建声阻抗剖面的方法。结合Hamilton经验公式,分离海底声速、密度,反演结果与海底采样样本分析值、经验值吻合较好。
Acoustic signal propagation is significantly influenced by sediment parameters in shallow water. In this paper, simulating results were shown that the inverse stability is affected by signal phase character. The bottom impedance was inverted by using the normal incidence pulse and echo oF Yellow sea experiment. Because the SNR of the echo amplitude decrement with the depth increment, a piecewise impulse inversion was adopted to invert the impedance profile, and then the sediment velocity and density were estimated by combining the Hamilton formula. The results well agree with the sample in situ. and the Hamilton empirical values.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第1期112-118,共7页
Periodical of Ocean University of China
基金
国家高技术研究发展计划项目(2001AA613040)资助
关键词
海底声参数
分段
冲激响应
相位特征
反演
acoustic parameters
piece-wise
impulse response
phase character
inversion
