The Characteristics Of Transceiver Separation Reverberation In Shallow Water

As a major interfering signal of active sonar ocean exploration,modeling and simulation of sea reverberation signal has the practical scientific significance.In particular,the research of multisite sonar reverberation signal not only can reduce the actual experiment cost,but also shorten the equipment development cycle.At the same time,the theoretical analysis of the reverberation signal is the basic research of the reverberation suppression in the target detection.In this dissertation,the modeling and simulation of the three-dimensional reverberation signal is carried out.The space-time characteristics of the bistatic reverberation signal is analyzed,and the space-time optimal processing method is used to effectively suppress the reverberation signal.First of all,reverberation signal is the synthesis of the scattering and propagation.The three-dimensional bistatic sea surface and ocean bottom scattering model discussion is the basic research of reverberation signal model.The influences of various angles,wind speed,bubble radius,submarine sedimentand and frequency near the sea surface on the scattering intensity of the interface are analyzed.Secondly,the isochronous ellipsoidal model is used to construct the three-dimensional reverberation model.Combined with the actual environment,the model is extended to the arbitrary height of the transmitting station and the receiving station,and the propagation of multipath bistatic reverberation signal is simulated.The effects of signal parameters on the reverberation intensity are discussed.The spectral characteristics and envelope characteristics of the reverberation signal are also analyzed.And compared with the actual multisite sonar reverberation experimental data in South China Sea,verify the correctness of the three-dimensional model.Finally,the space-time characteristics of the reverberation signal is studied,that is,the spatial angle and doppler characteristics.The space-time distribution of bistatic reverberation is deduced,and the space-time distribution of reverberation is verified when the sound source moves in different directions.The space-time optimal method is used to suppress the reverberation and has a good effect of reverberation suppression.