摘要
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.
出处
《信号处理》
CSCD
北大核心
2009年第5期777-780,共4页
Journal of Signal Processing