低轨卫星Link16数据链关键技术研究  

Research on key technologies of LEO satellite Link16 datalink

作　　者：孙召 陶孝锋[1] SUN Zhao;TAO Xiaofeng(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》2021年第3期64-69,共6页Space Electronic Technology

摘　　要：将Link16战术数据链搭载到低轨卫星上进行网络中继能够扩大数据链的通信距离,扩展战术信息的保障范围,增加数据链的态势感知距离。低轨卫星相对于地面数据链终端具有通信距离远,运动速度快等特点,如何将Link16数据链的技术体制进行适应性修改使得在不改造地面终端的情况下实现卫星Link16数据链是文章的主要研究内容,针对星地通信距离远造成的长时延对数据封装格式和RTT同步消息格式不适用的问题,提出星地传输时延补偿算法,设计了卫星节点的时隙结构,并推导出RTT精同步计算公式,针对多普勒频移,提出了接收机的时频同步方案,为未来低轨卫星Link16数据链的实现提供了可行性支撑。Carrying Link16 datalink on LEO satellite can expand the communication distance,expand the guarantee range of tactical information,and increase the situational awareness of datalink.However,compared with the ground datalink terminal,LEO satellite has the characteristics of long communication distance and fast motion speed.How to adapt the technical system of LEO satellite and without transforming the ground terminal,This article in view of data encapsulation format and RTT synchronization message format are not applicable in satellite-to-groud communication.Propose a time delay compensation algorithm and designe a time slot structure of satellite node and derive the RTTsynchronization calculation formula,in view of Doppler frequency shift,Propose the time-frequency synchronization scheme to provide feasibillity support for the realization of Link16 datalink of LEO satellite in the future.

关 键 词：低轨卫星 数据链 时延补偿 时频同步 

分 类 号：TN927[电子电信—通信与信息系统]