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GNSSISL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。
This paper analyses the actual state development of Global Navigation Satellite System（GNSS）, points out the need of the Inter-satellite Link（ISL） for GNSS. To achieve this requirement, it advises the Advance Orbit System（AOS） Space Data Link Protocol Recommendation can be used as a reference. The possible 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 for GNSS ISL, three main improvements are made, including optimizing virtual channel data unit frame structural components, reducing three services and improving on scheduling and multi- plexing scheme. A link layer protocol is designed and its performance is simulated. The relationship among Bit Error Rate（BER）, frame length, packet length and throughput is analysed. The simulation results show that the protocol designed can be a reference for GNSS.
出处
《电讯技术》
北大核心
2012年第2期130-135,共6页
Telecommunication Engineering
基金
国家自然科学基金资助项目(60972062)~~
