基于星地混合波束形成架构的馈电链路带宽压缩方法  

Feeder-Link Bandwidth Compacting Method Based on Hybrid Space-Ground Beamforming Architecture

作　　者：吴飞龙[1] 张宁[1] 张静宇 孙垂强[1] WU Feilong;ZHANG Ning;ZHANG Jingyu;SUN Chuiqiang(China Academy of Space Technology（Xi＇an）,Xi＇an 710000,China)

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2018年第3期30-34,共5页Space Electronic Technology

摘　　要：针对地基波束形成系统对馈电链路带宽要求过高的问题,提出了一种星地混合波束形成架构。该架构通过在星上对馈源信号进行低复杂度的数据降维处理再传回地面进行波束形成,有效降低了系统对馈电链路带宽的要求。文中给出了在均方误差最小意义下的基于特征值分解的星上压缩矩阵的计算方法,并分析了馈源信号无损压缩的必要条件。最后,对比了天基、地基、星地混合这三种波束形成方案的各自优缺点。结果表明,星地混合波束形成是未来最有应用前景的解决方案。To address the issue of ultra-large feeder-link bandwidth in ground based beanfforming （GBBF） , a framework of hybrid space-ground beamforming （HSGBF） is proposed. In this fi＇amework, the feed signals are firstly compacted through low-complexity data-dimension reduction and then transmitted to the ground station for the following beamforming procedure,which can efficiently reduce the required feeder link bandwidth. Also, the eigen value decomposition （EVD） based compact matrix design on-board with the rule of minimum mean square error （MMSE） is provided, following which the necessary conditions for lossless compression on feed signals were analyzed. Finally, the beamforming performance and imple- mentation complexity among the three schemes were compared, namely, space-based, ground-based and hybrid space-ground. Results show that the hybrid space-ground beamforming framework is the most promising technique for future mobile satellite systems.

关 键 词：地基波束形成 馈电链路带宽压缩 特征值分解 星地混合波束形成 

分 类 号：V474[航空宇航科学与技术—飞行器设计]