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A method based on parameter-induced stochastic resonance is proposed for target echo detection in the presence of shallow-water reverberation. The signal received by the horizontal sensor array is normalized and delayed to form the input to a bistable system. The system parameters are tuned properly to maximize the detection performance based on parameter-induced stochastic resonance techniques. Considering the limitation on the length of receiving arrays, the space-time unfolding method is suggested to largely improve the detection performance. [ABSTRACT FROM AUTHOR]