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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。
A low computational complexity minimum variance non-distorted beamforming (MVDR) algorithm is studied. The complex envelope of array received signal is narrow-band decomposed by frequency-shift and linear phase FIR low-pass filtering. The baseband signal of each subband signal For the minimum variance beamforming, the sampling frequency of the original signal can be reduced to be close to the bandwidth of the processing band. The main energy band of the signal can be selected, which can reduce the number of processing subbands and greatly reduce the computational complexity. Simulation results and lake test data prove the effectiveness of the proposed method and the resolution of weak targets is better.