单个二阶组合水听器的性能分析

摘要

对二阶组合水听器在各向同性噪声场中的工作性能进行了分析。推导了各向同性噪声场中二阶组合水听器输出的自协方差矩阵，分析了两种基于单个二阶组合水听器的波束形成方法，在此基础上推导了二阶组合水听器两种波束形成方法的处理增益公式。仿真结果表明，二阶组合水听器在小孔径下具有更好的指向性和更大的处理增益，它的常规波束形成器处理增益分布在5．23 dB-6．12 dB之间；它的MVDR波束形成器在不同方向具有相同的增益，值约为9．54 dB。%The performance of a single acoustic dyadic sensor (ADS)in an isotropic noise field was analyzed here. The covariance matrix of the ADS outputs in the isotropic noise field was deduced and two beam-forming methods based on a single ADS were analyzed.Then,the formulas for the processing gains of the two beam-forming methods were derived. The simulation results indicated that ADS has better directivity and bigger processing gain under small hole-diameters;the processing gain of its conventional beamformer (CBF)based on a single ADS is between 5.23 dB to 6.12 dB,and the processing gain of its minimum variance distortionless response (MVDR)beamformer based on a single ADS is about 9.54 dB in different directions.