低轨卫星通信系统下行链路设计  

Downlink Design of LEO Satellite Communication System

作　　者：苏曼 肖跃 刘垚圻 李民 孙加伟 陈宇 SU Man;XIAO Yue;LIU Yaoqi;LI Min;SUN Jiawei;CHEN Yu(Beijing Institute of Tracking and Telecommunication Technology,Beijing 100094,China;Nanjing Panda Handa Technology Co.,Ltd.,Nanjing 210014,China;Nanjing Mobile Communication&Computing Innovation Institute of Chinese Academy of Sciences,Nanjing 211135,China;Institute of Computing Technology,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]北京跟踪与通信技术研究所,北京100094 [2]南京熊猫汉达科技有限公司,南京210014 [3]中科南京移动通信与计算创新研究院,南京211135 [4]中国科学院计算技术研究所,北京100190

出　　处：《电讯技术》2022年第2期168-173,共6页Telecommunication Engineering

基　　金：民用航天“十三五”预先研究项目(D030102);江苏省重点研发项目(BE2021013-2)。

摘　　要：针对低轨卫星通信系统特点,结合当前世界上应用最广泛的数字卫星电视广播(Digital Video Broadcasting,DVB)协议,对卫星通信下行链路进行设计与验证。介绍了协议整体架构的设计和链路模型的搭建,重点描述了同步模块中的预频偏估计过程的设计。频偏预估计实现了在进行精细的频偏估计和补偿之前对大频偏的估计和补偿,降低了对后面频偏估计模块估计范围的要求,从而提高了整个链路频偏估计和补偿的性能。通过对整个链路进行仿真测试,结果验证了链路的实际效果良好,适用于工程性开发。According to the characteristics of low Earth orbit(LEO)satellite communication system and the world s most widely used digital satellite television broadcasting(DVB)standard protocol,the satellite communication downlink is designed and verified.The design of the overall architecture of the protocol and the construction of the link model are introduced,and the design of the frequency offset pre-estimation process in the synchronization module is emphasized.Frequency offset pre-estimation realizes the operation of large frequency offset estimation and compensation before fine frequency offset estimation and compensation,which reduces the requirement of the estimation range of the following frequency offset estimation module,thus improving the performance of the whole link frequency offset estimation and compensation.The simulation test verifies the good effect of the link and shows that it is suitable for engineering development.

关 键 词：低轨卫星通信 下行链路设计 DVB协议 频偏估计 

分 类 号：TN927[电子电信—通信与信息系统]