基于幅相加权的阵列天线波束赋形全局优化方法

【作者】 韩华龙； 王建；

【Author】 Han Hualong1 Wang Jian2 (School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731)1 (School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610054)2

【机构】 电子科技大学电子工程学院；

【摘要】 本文给出了一种利用幅相加权对阵列天线进行全局优化的方法。为了使天线的辐射波束形成给定的方向图,采用联合应用DFP和BFGS公式的变度量算法对阵列天线各单元的馈电幅度和相位分布进行优化,通过C++语言编程计算实现,从而使得优化后的阵列天线主波束形状能够与预给波束形状相吻合,达到设计要求。全局优化是本文的特色,它弥补了局部优化结果的精确度依赖于初始值的缺点,因而得以保证通过优化得到的天线主波束与给定波束的主瓣相吻合,副瓣也得到有效控制。该方法具有快速收敛,计算量小等优点,是一种解决阵列天线波束赋形问题的有效方法。更多还原

【Abstract】 In this paper, a new method for phase and amplitude optimization of array antennas is presented. In order to form a given antenna pattern for array antennas, variable metric algorithm, Davidon-Fletcher-Powell(DFP), Broyden-Fletcher-Goldfarb-Shanno(BFGS), and global optimization idea realized under c++ environment were joint used to optimize the phase and amplitude distribution of excitations. The global optimization algorithm is the merit of this method. Based on the global optimization algorithm, this method solved the disadvantage of local optimization that the precision of optimization result close depended on the initial value. Thus, the optimized main lobe of the antenna pattern is fitted for the given one and the side lobe level is efficiently controlled. The method shows fast convergence and small amount of computing. So it is a valuable beam shaping method for array antennas.更多还原