圆弧形面阵自适应波束形成快速计算方法

针对圆弧形面阵估计水下目标二维波达方向的问题,提出一种降维处理的自适应波束形成方法。利用圆弧形面阵模型简化阵列内插矩阵的计算,通过垂直和水平两阶段波束加权,降低自适应波束形成维数,从而实现快速估计声源二维波达方向的目的。仿真结果表明,所提改进方法的计算量较传统二维最小方差无失真波束形成方法降低约一个数量级,且在低快拍条件下具有更明显的噪声抑制优势。湖上实验数据处理结果验证,在复杂水声环境下,所提方法具有较好的目标分辨性能。 

Fast calculation method of adaptive beamforming for curved-surface array

An adaptive beamforming method based on dimension reduction is proposed,which uses curved-surface arrays to estimate the two-dimensional direction of arrival of underwater targets.The curved-surface array model is used to simplify the calculation of the array interpolation matrix.The dimension of adaptive beamforming is reduced by vertical and horizontal beam weighting,so as to realize the rapid estimation of the two-dimensional direction of arrival of the sound source.The simulation results show that the computational complexity of the proposed method is about an order of magnitude lower than that of the traditional two-dimensional minimum variance distortionless response beamforming method,and it has obvious advantages in noise suppression under low snapshot conditions.The lake trial data processing results verify that the proposed method has better target resolution performance in a complex underwater acoustic environment.