ZHANG Xuelei1,2,3 LIN Zhenglin1,4 HUANG Xiaodi1

(1 National Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Science  Beijing 100190)

(2 Graduate University of Chinese Academy of Sciences  Beijing  100190)

(3 Research Institute of TV and Electro-Acoustics  Beijing  100015)

(4 Haikou Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences  Haikou  570105)

Received Nov. 14, 2008

Revised Feb. 6, 2009

Abstract A hybrid inversion scheme of geoacoustic parameters, which combines dispersion characteristics of normal modes with transmission loss, has been proposed based on the facts that different parameters have different effects on sound field. First, considering the dispersion characteristics of normal modes were sensitive to the density and the sound speed of seabottom, and not sensitive to the seabottom attenuation coefficient, the group time delays of different modes and different frequencies were acquired through adaptive optimal kernel time-frequency representation, then the group time delays were taken as the cost function, and using a global optimal algorithm, the seabottom density and the profile of seabottom sound speed were deduced. Successively, the validity of inversion results was evaluated by the a posteriori probability. Last, the attenuation coefficient of sediment is inverted using the transmission loss data recorded from the ship radiation noise. The validity of the total inversion results has been evaluated by making use of the matched field processing source localization. 　　 

PACS numbers: 43.30