基于仅相位加权的宽零陷低副瓣波束赋形方法

Wide Null and Low Sidelobe Pattern Synthesis by Controlling only the Phase

针对采用对阵元施加幅度和相位激励或位置扰动等传统宽零陷形成技术,存在工程实现复杂且难度较大的问题,提出了一种仅改变相位分布的阵列天线宽零陷低副瓣波束赋形优化算法。该方法通过建立仅相位加权的宽零陷波束赋形目标模型,采用融合混沌搜索技术的改进粒子群算法进行优化,获得阵列天线各单元的馈电相位分布,在不改变各单元馈电幅度分布的前提下形成预定宽零陷波束形状,并达到低副瓣设计要求。仿真结果验证了采用新方法能够保持低副瓣下形成较深的宽零陷,具有快速收敛和较好稳健性的优点。

Because the traditional methods for wide null steering need change amplitude and phase distribution of excitations or position of array antenna, and it is difficult to achieve engineering implementation, a new method is proposed to implement pattern synthesis with wide null by controlling only the phase. In order to form a given antenna pattern with wide null and low sidelobe, particle swarm optimization and chaos search technique are jointly used to optimize the phase distribution of excitations. It overcomes the limitation of slow convergence and sensitivity to local convergence, and thus the optimized wide null of the antenna pattern is fitted for the given one and the sidelobe level is efficiently controlled. The experimental results show the effectiveness of the method.