Using liquid-solid coupling vibration model of the target echo generation mechanism and deriving coupled vibration formula, the target echo expression in the conditions of single and multiple excitation sources is drawn. The target echo generation mechanism is analyzed from a new point of view by building the target model in using a random process ARX models. Multi-input single-output ARX model is used to build target echo test model in shallow water environment. Ultimately, the target direct incident and direct echo are solved. The influence of multi-channel path is eliminated effectively. Measurement results equivalent to the free field is obtained. The effectiveness of the algorithm is verified by a pool experiments finally.
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