A Hydrophone Perturbation Method for Reverberation Suppression

Under the shallow sea condition, bottom reverberation is the main background noise. Especially the bottom and the buried targets echo are weak and signal-to-reverberation ratio is very low. So it is an important problem that how to improve the signal-to-reverberation ratio. This paper presents a method which is Perturbation Iteration Method. The method can reduce the intensity of bottom reverberation and improve the signal-to-reverberation ratio without changing the measurement environment and measurement equipments. This method sums the received signals to offset a portion of the unrelated components of the reverberation, using the different correlation radius between bottom reverberation and the target signal’s. This method’s physical meaning is clear and so simple to understand. At the same time it can avoid the complex signal processing methods. The simulation results show that the method can reduce the intensity of the bottom reverberation effectively, and can detect the target under low signal-to-reverberation cases.