The Study Of Array Processing Technology Based On The FBG Hydrophone

Along with fiber optic industry rising promptly in our country and with the improving of technology in production, fiber optic grating (FBG) sensor had become more and more popular. The FBG sensor has a series of prominent superiority, and it meets the advancing of performance arm and equipment working in water of navy. So it is very important to use FBG in detecting the accoustic signal in water. This work begins under such background.In this thesis, the technology of vector hydrophone array processing was studied. The performances of beam patterns of vector hydrophone array using different components were researched. The high resolution algorithm was applied in vector hydrophone array, extend aperture array and flexible array in the light of the specialty of vector hydrophone. The predominance of vector hydrophone array compare with sound pressure hydrophone array was attested by theory and simulation results. The trial of vector hydrophone linear array was elaborately designed to obtain the experimental results that well accorded to the simulation results and testified the theory results.The main content of this paper is as follows:(1) The development course and application situation of vector sensor array are reviewed systemically, the beamforming model using vector sensor array is established, it is the first time to classify the beamforming methods using vectorsensor array in detail, Type I and II beamformer are brought forward, combined beamforming method is also put forward. The array manifold of the common circular array and linear array founded on vector sensor elements are derivated. The directiviry expression of linear vector sensor array is also showed in the thesis;(2) This paper refers to the high revolution direction estimation methods in beam space to an array of vector sensors. This present algorithm distinguishes itself through utilizing the advantage that the fiber vector sensors provide from other beam space DOA algorithms in general regards. The vector sensor array space smooth algorithm is also presented here for handling coherent source signal which can efficiently get the DOA direction estimation results of coherent source signal. Moreover, combined with the vector sensor broadband beam formation algorithm, an idea about using vector sensor array for direction estimation in beam space;(3) The MUSIC spatial spectrum based-on vector hydrophone array was studied, The performance of suppression of grating lobes of MUSIC algorithm based-on vector hydrophone array was firstly analyzed. The results showed that the unambiguity DOA estimation could be obtained when the wavefield was undersampled using vector information. Self-initiating MUSIC direction finding estimation by iteratively researching the maximum of noise subspace MUSIC spatial spectrum was firstly studied. The initial parameters were obtained by a single vector hydrophone array manifold estimation that embodied the specialty of vector hydrophone array to make the MUSIC spatial spectrum rapidly and steadily converge to the maximum for obtaining the accurate DOA estimation.(4) The DOA of sound sources is estimated using MUSIC algorithm by a vector hydrophone ULA to improve the DOA estimation resolution. The simulation results indicate that a sharper main beam and higher resolution of DOA estimation can be obtained using MUSIC algorithm, and the ability to distinguish Multi-source is also improved.The technology of vector array processing was deeply researched in this paper. The theoretic result is verified by simulation and experimental results. The author hopes the thesis is useful to accelerate deep research and extend engineering application of the vector hydrophone technology.