Research On The Estimation Method Of Model Based Bottom Geoacoustic Parameters

Bottom geoacoustic parameters is an important factor affecting the sound propagation in the ocean,geoacoustic uncertain or inaccurate,affect prediction results of sound propagation,thereby affecting the performance of underwater target positioning based on sound propagation model.To obtain geoacoustic parameters is an important content of shallow water acoustic research,research on the acquisition of geoacoustic parameters is of great significance in military and civil.There are two kinds of methods to get geoacoustic parameters,one is seabed sampling,and measuring in Lab.one is the inversion of acoustic parameters based on physical model.Due to the degeneration and the complexity of the marine environment,geoacoustic inversion time and protect the environment,acoustic parameters and can obtain a wide range of geoacoustic inversion using sound propagation is the main method of underwater acoustic field.Aiming at the problem of obtaining the geoacoustic parameters,combined with the acoustic propagation model and signal processing model based signal processing theory,by constructing the state equation and measurement equation,combining particle filter algorithm,the posterior probability distribution using weighted particle representation parameters,an iterative implementation of parameter tracking,parameter inverse problem of tracking problem for conversion or goal state for the problem of parameter selection,the maximum posterior probability of the state as the target state.Based on the theory of particle filter algorithm,the theory of sound propagation model and the marine environment,determine the geoacoustic inversion parameters,selected as pressure measurements,and the introduction of particle swarm optimization particle filter,established bottom acoustic parameter pressure inversion method based on probability model.To carry out the simulation analysis of particle filter for geoacoustic inversion,prove the feasibility of the inversion method,particle swarm optimization particle filter can reduce the particle number and save time,and improve the retrieval accuracy.Using the signal sea experiment on vertical hydrophone array receiving the deep explosion source,the experimental data processing of broadband geoacoustic inversion of sound source based on the bottom geoacoustic parameters the experimental sea area.