基于DBF的波束功率控制及优化设计技术  

Beam power control and optimization design technologybased on digital beam forming

作　　者：李彪 吴欢 崔蕾[1] 李岩[1] 周颖 万继响[1] LI Biao;WU Huan;CUI Lei;LI Yan;ZHOU Ying;WAN Jixiang(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》2022年第6期36-41,共6页Space Electronic Technology

基　　金：科技部国家重点研发项目(编号:2019YFB1803200)。

摘　　要：低轨卫星系统近年来得到了广泛的关注和发展,卫星的轨道高度低,具有传输延时短、路径损耗小的特点,可以为小型化用户终端提供服务,但也存在单星覆盖区内路径差异大、卫星业务分配不均和工作动态范围大的问题。针对这些问题提出了一种适用于低轨卫星的波束优化设计方法,采用地球匹配波束设计,来实现更好的链路质量和覆盖效率。在下行波束设计中,通过唯相位加权优化设计方法,在满足波束增益要求及波束间C/I的基础上,实现了单波束功率由0%~100%的调整能力。针对低轨卫星移动通信业务随时间变化,导致发射组件输出功率长时间工作于回退状态的特点,提出了一种通过卫星业务处理器实现业务量变化与功放的最佳效率供电电压匹配调整的星上自适应功放功率随动技术,使得功放平均效率有效提高,减少了天线的平均功耗和热耗。LEO satellite system has received extensive attention and development in recent years.The satellite has low orbit height,short transmission delay and small path loss,and can provide services for miniaturized user terminals.But at the same time,it also has the problems of large path difference in single satellite coverage area,uneven satellite service distribution and large working dynamic range.Aiming at these problems,a beam optimization design method for LEO satellites is proposed,which adopts earth matched beam design to achieve better link quality and coverage efficiency.In the downlink beam design,the phase only weighted optimization design method is adopted to achieve the adjustment ability of single beam power from 0%to 100%on the basis of meeting the beam gain requirements and inter beam C/I.In view of the characteristics that the output power of the transmitting module works in the fallback state for a long time due to the change of the LEO satellite mobile communication service with time,a satellite adaptive power amplifier power follow-up technology is proposed to realize the matching adjustment between the change of the service volume and the optimal efficiency of the power amplifier through the satellite service processor,which effectively improves the average efficiency of the power amplifier and reduces the average power consumption and heat consumption of the antenna.

关 键 词：数字波束形成 地球匹配波束 HBT功放 功率动态控制 

分 类 号：TN82[电子电信—信息与通信工程] V443[航空宇航科学与技术—飞行器设计]