一种宽带高分辨MVDR有效算法研究

研究了一种低计算量的宽带最小方差无畸变波束形成(MVDR)算法,利用频移和线性相位FIR低通滤波对阵列接收信号的复包络作窄带分解,对各子带信号的基带信号作最小方差波束形成,所以可将原始信号的采样频率降到接近处理频段的带宽大小,选择信号主要能量频带,可以减少处理子带个数,大大降低了运算量。仿真和湖试数据分析结果证明了该方法的有效性,且对弱目标分辨性能较好。

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.