The Research To Key Techniques Of The Far-field Acoustic Array Orientation Based On The Conformal Array

The key technology of voice array positioning system is array signal processing. Due to the universality of voice signal, voice signal processing is an important branch in the field of signal processing. Signal processing involves two aspects: one is the Beamforming(Daptive Beamforming, DBF), the other is DOA(Direction Of Arrive, DOA) estimation. Physical array signal processing is dependent on the array structure,so array structure is the foundation. As the improvement of the science and technology and the increasing complexity of environment, conformal array research is becoming more and more important. Considering the actual problem such as aerodynamics, hydraulics, conformal array with the unique performance can improve system performance better. Therefore, this paper chooses the two important aspects: choosing the conformal array as the research object and studying the target localization algorithm based on conformal array sonar system. The major works of this paper are as follows:1.Through the analysis of the relationship of conformal array with regular array, and the use of conventional analog conformal array problems, the model of the conformal array receiving signals were established. The problem of conformal array gain were studied as the main content through the MUSIC algorithm, and the effect of algorithm in the case of the conventional array cases and conformal array were analyzed. Through the principle of submatrix, matrix selection algorithm based on array units power was proposed.2.Through analyzing the noise of the conformal array, double measurement method is put forward, on the basis of power submatrix. By contact DOA and digital beamforming technology DBF, two improved algorithms based on conformal array direction finding positioning put forward. One is interferometer algorithm combined with MUSIC algorithm, the other optimization algorithm is DBF technology combined MUSIC algorithm.3.According to the different formationsand different algorithms, the concrete implementation steps were given, and the effects were simulated. At the same time improved algorithm which could be adjusted was given,so as to adjust algorithm according to different situations. Analyzed the research content in this paper, according to the actual situation of the far field acoustic array orientation technology, system interface was designed, and the simulation data was analyzed.The research based on the conformal array is increasing, for the shade problem of conformal array, while the simulation verified the effectiveness and universality of the improved algorithm in this paper. Conformal shape will become more complicated, its "intelligent" of matrix selection algorithm should also be improved, this is the direction of future research. At the same time, the conformal array algorithm how to improve the precision of positioning,and the conformal array units fully considered and other details, will be a systematic research in the future.