摘要
针对现有海底地声参数估计方法的不足,提出了利用相控参量阵浅地层剖面仪接收的多角度海底反向散射信号进行地声参数估计的方法,首先利用正下方和斜入射方向上沉积层上、下表面的差频反向散射信号进行沉积层厚度和声速估计,然后利用正下方沉积层上、下表面两个不同频率的差频信号的反向散射信号估计沉积层衰减系数,最后利用正下方沉积层上表面原频反向散射信号估计沉积层阻抗,计算沉积层密度从而解决和声速的耦合性,通过水池试验验证了该方法的有效性。
Aiming at the disadvantages of current methods to estimate sediment geoacoustic parameters, a geoacoustic esti-mation scheme is presented, in which used are the bottom back reflection signals from multiple angles sampled with a multi-beam parametric array sub-bottom profiler. Firstly, the sediment thickness and sound speed are estimated with difference frequency backscatter signals separately from upper and lower sediment surfaces with vertical and outboard direction. Then, the sediment attenuation coefficient is estimated by use of the two backscatter signals with different difference frequencies from upper and lower sediment surfaces with vertical direction. Finally, the sediment property impedance is estimated with primary frequency backscatter signals from upper sediment surface with vertical direction and followed by the computation of the sediment density, thereby solving its coupling with sound speed. The efficiency is tested through pool experiment.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第8期204-210,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:41006057
41376103
41327004
41306182)
中央高校基本科研业务费(批准号:HEUCF130501)资助的课题~~
关键词
地声参数估计
反向散射信号
多角度
参量阵
geoacoustic parameters estimation
backscatter signals
multiple angles
parametric array
