Active Acoustic Decoy Acoustic Simulation System

The active acoustic decoy with the function of ‘receiving and sending’is an important soft-kill weapon against modern intelligent torpedo.The distortion of acoustic decoy receiving and transmitting signal influenced by the near-field scattering sound field of the electronic cabin,and the leakage signal from acoustic decoy’s transmitting transducer to the receiving hydrophone are the important factors which affect the performance of active acoustic decoy in the mode of ‘receiving and sending’.Based on this,this paper proposed a response signal simulation model which has considered the acoustic scattering of the electronic cabin and the acoustic leakage between the transmitting transducer and receiving hydrophone,and developed an active acoustic decoy simulation system based on the COMSOL platform.Firstly,this paper proposes the overall design idea of active acoustic decoy acoustic simulation system based on the working process of active acoustic decoy.The functional requirements and main components of the system are introduced.Then two key acoustic simulation methods of the simulation system are introduced: the structural acoustic finite element simulation method and the planar element algorithm.The electronic cabin’s near sound field excited by the detection signal of enemy active sonar and the transmitting signal of decoy’s transmitting transducer are simulated by using COMSOL Multiphysics.By investigating the influence of scattering sound field on the acoustic decoy’s receiving and leakage signal,we find that the electronic cabin has little influence on the received active sonar signal,but has great influence on the leakage signal.In the next part,this paper describes the signal simulation method of the simulation system,introduces the echo simulation method of underwater target based on the lanar element method,establishes the feedback model of ‘receiving and sending’ mode,and describes the transmission process of the acoustic signal under the two working modes: ‘receiving and sending’ and ‘storing and forwarding’,puts forward the simulation model of receiving signal 、transmitting decoy signal and the receiving signal of active sonar.And simulates the decoy signals of the signal processor in fixed gain mode and multi highlight mode respectively,analyzes the effect of leakage signal on the fidelity of decoy signal when different isolation measures are taken in‘receiving and sending’ mode.Finally,based on the COMSOL development platform,an active acoustic decoy acoustic simulation system is developed,the accuracy and performance of the system are verified by on-line test.The system described in this paper is deployed on the cluster computer by COMSOL Server.Compared with the existing acoustic decoy simulation system,the influence of the scattering effect of the electronic cabin is considered,and the simulation function of the working mode in ‘receiving and sending’ is added.The interactive interface is simple and easy to operate,which can provide reference for the design and deployment of the active acoustic decoy.