Research On Signal Detection Technology Of Cooperative Detection Target Simulator

With the world’s desire for marine resources and the intelligentize development of underwater military equipment,multi-platform sonar cooperative detection has become more and more popular in underwater acoustic research since it more and more difficult were found in submarine detection with passive sonar.With the continuous development of underwater equipment and weapons platforms stealth technology,and the active sonar of receiver automatically exposes its position,so the multistatic system with flexible concealment is preferred.The target simulator is an important part of the multi-platform sonar development and testing,and the reflection echo of the real target can effectively improve the research efficiency and reduce the research cost.Based on the multi-platform sonar system,the parameters of the target simulator system are designed.Firstly,based on the multi-platform sonar working mode,the target simulator system is designed mainly including the overall parameters and waveform design of the target simulator.According to the sonar equation,the detection threshold,propagation loss and the total noise level of the input terminal are calculated and the calculated parameters are realized in the equipment.According to actual needs,design a combination of active sonar emission signal waveform,the signals at the same time,guarantee the detection performance can be adjusted according to the demand,more suitable for different conditions of sonar test base.Secondly,the influence of multi-path interference on the signal detection performance of simulators is analyzed,and the characteristics of multi-path channel are analyzed and the multipath signal is simulated using the Bellhop model.Two kinds of signal detection methods,matching filter and Page Test signal detection algorithm are proposed.The detection performance of these two methods is verified by sea test data.Finally,analyses the influence of the ship radiated noise for detecting simulator,using the minimum mean square error spectral estimation as signal enhancement algorithm,inhibition of ocean ambient noise in the signal to be detected and the ship radiated noise,increase the input SNR of signal detection,improve detection performance.In this paper,a method of minimum mean square error spectrum estimation and transient time detection is discussed,and the feasibility of this algorithm is verified through the analysis of data processing in sea trials.