一种恒定束宽的宽带自适应波束形成算法

摘要

Wideband beam forming is a difficult problem for phased array radar digital signal processing. The present wideband beam forming methods only satisfy one advantage of constant beam width or adaptive. For the radar to incorporate both advantages, this paper presents a wideband adaptive beam forming method based on the RLS algo- rithm. Firstly, an adaptive reference beam pattern is obtained, then the constant beam pattern range is determined and other frequency weights is worker out by RLS algorithm, and finally wideband beam forming can be obtained. This method can not only ensure constant beam width, but also realize adaptive null control. The validity is investi- gated through a series of simulations.%宽带波束形成是相控阵雷达数字信号处理的难点。针对目前宽带波束形成只能满足单一恒定束宽或自适应情况，为兼具两种优势使雷达工作状态更佳，文中基于最小二乘算法提出了一种自适应波束形成方法，该方法通过获得自适应参考波束图，确定波束图恒定范围根据最小二乘算法求取其他频点权值，并进行宽带波束形成。该方法不仅能保证恒定柬宽，而且可实现自适应零陷控制。仿真实验证明了算法的有效性。