Research on an efficient wideband high resolution MVDR algorithm

An efficient high resolution wideband MVDR beamforming algorithm with low computational load is presented. By frequency shift and linear phase FIR low-pass filter, the signals received by the array are decomposed to multi-narrowband baseband components, then the high resolution MVDR method is used to the baseband signals of each subband complex envelope. Consequently, the signal sampling frequency can be decreased to the size equal to or larger than the bandwidth of the subband signal, and the number of the subbands can be reduced by selecting the main energy concentrating subbands. As a result, it is expected that the amount of computation is reduced greatly. Comput- er simulation and experiment results using lake trial data verify the effectiveness of the proposed method, and it also shows better performance on weak targets discrimination.