一种星载阵列天线的高效波束赋形算法

发布时间：2018-04-08 16:05

本文选题：波束赋形　切入点：迭代最小方差　出处：《电波科学学报》2016年03期

【摘要】：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.
[Abstract]:With the application of active phased array and digital beamforming technology, multibeam array antennas for low orbit satellite communication can not only form multiple fixed low sidelobe beams with constant ground flux, but also have the ability to change with the requirements of communication tasks.The ability to dynamically adjust the shape of a pattern.However, the commonly used beamforming algorithms with high performance can not be directly applied to on-line real-time computation because of their large computational complexity, slow convergence speed and complex optimization parameters.To meet the above requirements, an efficient iterative minimum variance pattern synthesis method is proposed.In this method, the weighted approximation of the direction map and the phase unconstrained technique of the pattern are adopted. The method has the advantages of simple iterative process and less optimization parameters on the premise of satisfying the higher requirements of the main lobe shaping accuracy and the sidelobe level control.Due to its robustness and less computation, the algorithm can partly meet the need of on-line calculation of the weight coefficients of satellite communication systems which require dynamic changes of beam pattern.
【作者单位】：南京理工大学电子工程与光电技术学院;上海航天电子有限公司;
【基金】：国家自然科学基金(No.61501240) 上海航天基金重点项目(SAST201437)
【分类号】：TN820.15

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