Technology Of DOA Estimation Based On Vector Transducer

Compared with the pressure hydrophone, vector sensors have many advantages. In this dissertation, we study directivity of acoustic vector sensor to sharp a narrow directivity and use it to estimate direction. The dipole and single-side directivity of single vector sensor or two elements vector array are studied and simulated in computer. Several methods of sharp a narrow beamwidth is presented and used to form a narrow directivity. All the methods are verified by computer simulations and real-data processing. The main content can be outlined as follows:The first chapter is an introduction. Introduce researches about vector transducer both native and foreign.In the second chapter, we study the working principle of the vector transducer. mainly the calculation mould, receiving signal mathematic mould, azimuth and elevation calculation for two-dimensional pressure-gradient vector transducer.In chapter three, we study the vector transducer beamforming algorithm for dipole and single-side, and electron circumgyratetion are given.Chapter four introduce the method of Adaptive Signal Processing, especially the computer simulations and mathematic mould about LMS.In chapter five, several narrow beamwidth processing arc performed using experimental data collected from lake and cistern experiment.In chapter six, summarize the work of this dissertation and some suggestions are advanced.In summary, in this dissertation it is proved by theory deducing, computer simulations and real-data processing that narrow beamwidth processing can improve the detection precision and mult-targets resolving ability.