电子学报2017，Vol.45Issue(3)：762-768,7.DOI:10.3969/j.issn.0372-2112.2017.03.037
中低轨卫星跨层激光链路二次同步切换方法
A Two-Step Synchronous Handover Scheme of Optical Inter-Orbit Links in LEO and MEO Satellite Network
摘要
Abstract
In optical double-layer satellite network,the stability of network is determined by the OIOLs (Optical Inter-Orbit Links) seamless handover directly.Asynchronous handover method often results in frequent topology reconfiguration.However,synchronously centralized handover leads to cutoff of connection between two layers,and thus network operation condition gets out of control.A two-step synchronous handover scheme of MEO (Medium Earth Orbit) satellite and LEO (Low Earth Orbit) satellite constellation is proposed.Connection between LEO satellites and MEO satellites is guaranteed and topology reconstructing frequency is decreased.When orbit period of MEO satellite is integer multiple of LEO satellite,space position relation between LEO and MEO satellites is investigated.The second-order aspheric perturbation model of LEO satellite and MEO satellite constellation is built up.The orbit period ratio between MEO and LEO satellite is calculated as 3.The double-layer satellite network is designed.The laser links between the two layers in the elaborately configured LEO/MEO constellation pattern are divided into two groups based on connection and handover sequence.1/4 relative periods of the MEO satellite is considered as the handover criterion.In each 1/4 relative period,one group of inter-layer laser links switches synchronously.Research results show topology reconstructing frequency is reduced to 1/7 of link handover frequency.The average network time delay is decreased by 30ms compared with synchronously centralized handover method.关键词
卫星光网络/跨层激光链路/无缝切换/同步切换Key words
optical satellite network/optical inter-layer links/seamless handover/synchronous handover分类
信息技术与安全科学引用本文复制引用
李勇军,吴继礼,赵尚弘,邓博于,缪新萍..中低轨卫星跨层激光链路二次同步切换方法[J].电子学报,2017,45(3):762-768,7.基金项目
国家自然科学基金(No.6231012) （No.6231012）
陕西省自然科学基础研究计划(No.2015JM6360) （No.2015JM6360）
