一种低旁瓣数字波束形成方法

A low sidelobe beamforming algorithm

线性约束最小方差准则(LCMV)在波束形成技术中得到了广泛的应用。但是,很多情况下,它会产生偏高旁瓣。本文基于多线性约束最小方差准则,提出了一种降低旁瓣的波束形成算法。该算法通过搜索技术寻找到已形成波束图的最高旁瓣点,建立对应方向矢量上的增益方程,将其添加到原来的LCMV准则约束条件中,然后利用多线性约束最小方差准则进行权值更新,实现旁瓣的降低。该算法不仅适用于均匀阵列,还适用于非均匀阵列,仿真结果表明了该算法的正确性和有效性。

Linear constrained mimimum variance algorithm which may make the high sidelobe level is widely used in the field of beamforming. Using multi-linear constrained minimum variance （LCMV） repetitiously, a new low sidelobe beamforming algorithm is presented. By searching the previously formed beam pattern, the highest sidelobe location is found and the correspongding direction vec- tor is added to the constrained conditions of multi-linear constrained minimum variance algortithm to receive the new weight value which can obtain a low sidelobe level. This algorithm is not only applicable to the uniform arrays, but also to the ununiform arrays, the emulation results show the validity and efficiency.