摘要: |
分析了全球卫星导航系统(GNSS)发展的现状,指出建立GNSS星间链路(ISL)的需
求。针对这样的需求,提出以高级在轨系统(AOS)空间数据链路层协议建议书为参考来设
计适用于GNSS的星间链路层协议。对GNSS星间可能传输的业务信息基于AOS的建议进行了归
类,认为GNSS星间链路层协议可以使用AOS,具体给出了AOS建议下星间链路层协议的设计。
为使协议更适合GNSS ISL链路层,主要从3个方面对AOS进行改进,即:优化了虚拟信道数
据单元的结构,削减了3种服务,改进了虚拟信道调度与复用方法。对协议的性能进行了分
析仿真,得出了信道误码率、帧长、包长和吞吐量的关系,仿真结果表明所设计的协议可
作为GNSS星间链路协议设计的参考。 |
关键词: 全球卫星导航系统 星间链路 业务分类 虚拟信道数字单元 复用业务 协议设计 |
DOI: |
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基金项目:国家自然科学基金资助项目(60972062) |
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Link Layer Protocol Design of Global Navigation Satellite System |
DONG Fei-hong,LV Jing,CHANG Jiang,KONG Bo |
() |
Abstract: |
This paper analyses the actual state development of Global Navigation S
atellite System(GNSS), points out the need of the Inter-satellite Link(ISL) fo
r GNSS. To achieve this requirement, it advises the Advance Orbit System(AOS
) Space Data Link Protocol Recommendation can be used as a reference. The possib
le traffic which may be sent on ISL is classified based on AOS recommendation.
It indicates the AOS can be appropriate. To let the protocol appropriate f
or GNSS ISL,three main improvements are made,including optimizing virtual channe
l data un
it frame structural components, reducing three services and improving on schedul
ing and multiplexing scheme. A link layer protocol is designed and its performan
ce is simulated. The relationship among Bit Error Rate(BER), frame length, packe
t length and throughput is analysed. The simulation results show that the proto
col designed can be a reference for GNSS. |
Key words: inter-satellite link class of traffic VCDU multiplexing service protocol desi
gn |