一种混合范数整形分辨率可调的波束形成器

针对实际应用中需要调节分辨率的现象,提出一种混合范数整形分辨率可调的波束形成器。该方法利用信号的稀疏特性与子空间方法使零陷和旁瓣降低的同时,根据l₂范数具有促进稠密解的特性,加入了对主瓣的l₂范数约束,从而增大主瓣的阵列增益强度,使主瓣宽度变窄。仿真结果表明,调节加权系数可以调节波束图的主瓣宽度、旁瓣高度和零陷深度,实现了分辨率可调的目的。也可以根据实际需要通过调节加权系数实现各性能参数间良好折衷。

A Mixed Norm Shaped Beamformer with Adjustable Resolution

In view of the fact that the resolution sometimes is needed to be adjusted in practical applications, a mixed norm shaped beamformer with adjustable resolution is proposed in this paper. The method uses signal sparse characteristics and signal subspace method to reduce the nullings and side lobe, meanwhile based on the property of l2 norm improving denseness solution, it adds l2 norm constraint on the main lobe to increase the gain strength of the main lobe, narrowing the width of the main lobe. The simulation results show that adjusting the weighting coefficient can adjust the main lobe width, sidelobe height and nulling depth, so it realizes the purpose of adjustable resolution. And according to the actual needs, adjusting the weighting coefficients can also realize good tradeoff among the performance parameters.