采用约束最小平方和法实现近场波束形成

本文研究了近场情况下的波束形成问题。对于任意结构阵列,提出了实现近场波束形成的一种约束最小平方和法,由近场信号模型来设计近场波束。该方法在对波束旁瓣施加约束的条件下,使波束主瓣的误差平方和最小,可借助于优化工具箱实现。该方法在主瓣区域和旁瓣区域都能得到满足设计要求的波束性能,不仅可以方便地控制期望响应,而且简单易行。基于32元均匀离散圆阵的仿真设计结果表明了本文方法的有效性。

Nearfield beamforming using a constrained least-square method

A constrained least-square method for nearfield beamforming is presented. The method uses the nearfield signal model to design the beamformer and can be used for arbitrary geometry arrays. In the designing procedure,sum of the square errors in the mainlobe regions is made minimal while the sidelobe regions of the beampattern are constrained. The desired beam design specifications can be obtained both in the mainlobe and sidelobes,and the implementation of the method is easy. The simulation results of a 32-element uniform circular array verify the effectiveness of the method.