The Research And Implementation Of Motion Analysis Algorithm For Underwater Acoustic Target

China is a marine country with about 3 million square kilometers of ocean area.Therefore,as the first line of defense for national security,marine safety must be paid more attention.In the underwater defense and combat system,there is a proverb of "pre-emptive,backwardness in the people",where "pre-emptive" need to rely on accurate and timely target motion analysis technology.In this thesis,the algorithm of motion analysis of conventional underwater acoustic targets,including the bearings-only algorithm,the bearing and frequency algorithm,dual/multi-array algorithm and space-time integration algorithm,is studied in detail.The advantages and disadvantages of these algorithms and the application scenarios are given by comparison simulation.In view of the uncertainty of the azimuth information obtained from the measured data,this thesis improves the traditional algorithm model,gives the concrete solution algorithm,simulates the performance of the improved algorithm,and carries out the actual test data simulation analysis.Based on theresults of the algorithm,the software design of the target motion analysis system is realized by VS2013.Firstly,this thesis briefly introduces the research background and significance of the target motion analysis,and explores the development of target motion analysis technology.On the basis of observability,this thesis studies the least-square algorithm,the modified instrumental variable algorithm,extend kalman filter and the sampling importance re-sampling filter,which belong to the bearings-only target motion analysis algorithm of single matrix.Based on the theoretical research,the MATLAB simulation environment is set up,and the algorithms are simulated.The feasibility of the bearings-only algorithm under the observable condition is verified by the comparison experiment.Because bearings-only target localization motion analysis is subject to strict observability requirements,this thesis studies the target motion analysis algorithm of joint multi-information,which can improve the positioning performance by combining other passive characteristic information,including the TMA algorithm with bearings and frequencies,the target motion analysis algorithm of dual/multi-array,and space-time integration algorithm.Through the establishment of the underwater target motion model,the principle of the algorithm is studied deeply,and the simulation calculation is carried out,which provides the basis for the engineering staff to choose the appropriate target motion analysis algorithm in practical application.In the application process of verifying the algorithm using the measured data in actual,it is found that the actual data is non-equal spacing sampling.So this thesis proposes an optimized algorithm model for non-equal spacing sampling.Using the method of real-time updating sampling interval to solve the problem of target motion analysis in the case of incomplete measurement,so that the application range of TMA is extended.At the same time,in order to combine the research results with the engineering application,the target motion analysis system software was designed.According to the requirements of engineering experiment,the software platform can quickly establish the simulation environment,complete the simulation of the performance of the algorithm,and can process the data collected at sea in real time,which could assist the marine researchers in more effective monitoring and management.In this thesis,the multi-angle and multi-platform research of the underwater acoustic motion analysis algorithm in two-dimensional space is carried out,which provides a solid and reliable foundation for the further research and engineering applications.