Research of the Adaptive Beamformer Based on the Frequency Energy Normalization  

作　　者：马启明 王宣银 杜栓平 

机构地区：[1]State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University [2]Hangzhou Applied Acoustics Research Institute

出　　处：《Defence Technology（防务技术）》2009年第1期29-35,共7页Defence Technology

基　　金：Sponsored by New Century Excellent Talent Support Project (NCET-04-0545)

摘　　要：An algorithm of broadband minimum variance distortionless response(MVDR) based on the frequency energy normalization is proposed.First,every narrowband frequency component of the broadband signal is normalized by the total narrowband energy of all array elements,and the narrowband power is calculated by MVDR.Finally,final spatial energy spectrum can be obtained by averaging or summing all results of every narrowband frequency bin.Any prior-information about the noise or the signal is unnecessary for the proposed method in this paper.The processing gain of the proposed method compared to the conventional broadband MVDR can be obtained as long as the amplitude fluctuation of the array noise frequency spectrum is severer than that of the target signal.The validity of the method is validated by the optimal signal detection theory.Simulation and real data are used to validate the performance of the method.Analysis results show that about 4 dB processing gain compared to the general broadband MVDR can be reached by the proposed method.An algorithm of broadband minimum variance distortionless response （MVDR） based on the frequency energy normalization is proposed. First, every narrowband frequency component of the broadband signal is normalized by the total narrowband energy of all array elements, and the narrowband power is calculated by MVDR. Finally, final spatial energy spectrum can be obtained by averaging or summing all results of every narrowband frequency bin. Any prior-information about the noise or the signal is unnecessary for the proposed method in this paper. The processing gain of the proposed method compared to the conventional broadband MVDR can be obtained as long as the amplitude fluctuation of the array noise frequency spectrum is severer than that of the target signal. The validity of the method is validated by the optimal signal detection theory. Simulation and real data are used to validate the performance of the method. Analysis results show that about 4 dB processing gain compared to the general broadband MVDR can be reached by the proposed method.

关 键 词：自适应波束形成器 正常化 频率 能量 最小方差无畸变响应 宽带信号 MVDR 噪声频谱 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]