子阵级ADL-MVDR自适应波束形成算法

Adaptive beamforming algorithm based on ADL-MVDR at sub-array level

大型面阵的阵元数量较大,导致全自适应波束形成的计算量显著增长,通过子阵级波束形成则可以进一步降低算法运算量。研究常规面阵的非均匀子阵波束形成技术,在常规MVDR算法的基础上,引入自适应对角加载ADL技术,提出基于MVDR-ADL的子阵波束形成算法,避免栅瓣的产生,进一步抑制噪声的影响。仿真结果表明,所提算法在降低方向图旁瓣电平的同时,进一步减少了算法的运行时间。

The calculation amount of adaptive beamforming is greatly increased due to the large number of array elements in the planar array,which can be further reduced by means of beamforming at sub-array level.The non-uniform sub-array beamforming technique for the conventional planar array is studied in this paper.On the basis of conventional minimum variance distortion response(MVDR)algorithm,the adaptive diagonal loading(ADL)technique is introduced,and the adaptive beamforming algorithm based on ADL-MVDR at sub-array level is proposed to avoid the generation of grating lobe and further suppress the noise influence.The simulation results show that the proposed algorithm can further shorten the running time of the algorithm while deducing the sidelobe level of directional diagram.