由爆炸声源及传播损失反演海底声学参数

以2001年东中国海（ECS）一次浅海声学试验（ASIAEX）获得的爆炸声源的声信号和声传播损失，进行海底声学参数反演。对宽带爆炸声源（WBS）进行研究，由爆炸声源的声信号提取出海底反射波与直达波，从而得到海底垂直反射系数，结合Hamilton的经验公式反演出海底等效声速和密度。反演所得结果与海底取样结果相近。由传播损失反演海底声衰减，选取适当的代价函数，调整声衰减，使得代价函数最小，从而反演出海底声衰减。运用反演得到的海底参数计算的传播损失值与试验结果符合较好。

Sea-bed acoustic parameters inversion by explosive sources and transmission loss

The explosive source signals and the transmission loss are used to estimate sea-bed acoustic parameters from the 2001 Asian Seas International Acoustics Experiment （ASIAEX） conducted in the East China Sea （ECS）.The analysis of the wide-band explosive sources（WBS） has been made in this paper. From the reflection wave from sea-bottom and the direct wave derived from the bomb signals, the vertical reflection coefficient is obtained. Combined with Hamilton＇s empirical equations,the equivalent sound velocities and densities of the sea-bed are inverted,and the results are similar to the datas from cores. Sediment attenuation is inverted from the transmission loss. The cost function needs to be chosen properly, because it was varied with the sediment attenuation. When the value of the cost function reaches the minimum, the estimated attenuation is inverted. The transmission loss calculated from the inversion results is in agreement with the experimental values.