一种星载阵列天线的高效波束赋形算法

随着有源相控阵和数字波束形成技术的应用, 低轨道卫星通信多波束阵列天线不仅可以形成同时多个固定的对地等通量低旁瓣赋形波束, 还具备了可以随着通信任务需求变化, 动态调整方向图形状的能力.但是目前常用的高性能波束赋形算法, 运算量较大, 收敛速度慢, 优化参数调整复杂, 无法直接应用于在线实时计算.针对上述要求, 提出了一种高效的迭代最小方差方向图综合方法.该方法采用方向图分区域加权逼近和方向图相位去约束技术, 在满足较高的主瓣赋形精度和旁瓣电平控制等指标要求的前提下, 具有迭代过程简单、优化参数少、算法稳健和运算量少等特点, 可以部分满足要求波束方向图动态变化的卫星通信系统权重系数在线计算的需要.

An efficient pattern synthesis method for satellite array antenna

With the application of active phased array and digital beamforming techniques, low earth orbit(LEO) satellite communication array antenna not only forms fixed multiple transmit and receive beams to cover the visible earth, but also has the ability to dynamically adjust the pattern according to the requirements of communication task. The existing high performance pattern synthesis optimization algorithms can not be directly used in space-borne online real-time computing. In this paper, an efficient iterative least-squares pattern synthesis method is proposed with simpler iteration process and less adjustable parameters compared to the most popular iterative algorithms under the same synthesis accuracy and sidelobe level requirements. Pattern approximation with weighted regions and pattern phase constraint relaxation are adopted. The proposed method can partially meet the online weight vector update requirement for satellite communication pattern dynamic synthesis.