Discussion on SFODB Application for Spacecraft Data Management
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摘要: SFODB(Spaceborne Fiber Optic Data Bus)的提出主要是为解决飞行器内部有效载荷数据率日益提高这一迫切问题,它是一种基于商用异步传输模式(ATM)的高速航天数据总线技术,适合于空间探测器的海量数据包传输.其物理拓扑是由光纤链路连接多个FBIU单元以及单个CFBIU单元组成的环形网络,各节点之间的距离不超过100m,基本数据率可从200Mbit·s-1变化至1Gbit·s-1,并具有极高的实时性和可靠性,相比其他总线网络规模小,性能更优.针对SFODB的特性,分析了其发展现状和技术途径,提出了一种在飞行器内部采用SFODB总线作为主干网的数据网络架构,该网络能完成飞行器内部不同数据率载荷的分类分层可靠传输.在此基础上对SFODB的研究与应用提出了建议.Abstract: SFODB is used to solve the data exchange for payload of high data rates in spacecraft and transmit mass detector data, which is proposed by the United States Department of Defense. It is a high-speed aerospace data bus based on commercial Asynchronous Transfer Mode (ATM). In its physical layer, the fiber link connects many FBIU units and single CFBIU unit to compose a ring network. The distance between each node cannot exceed 100m, and the data rate ranges from 200Mbit·s-1 to 1Gbit·s-1. The data bus has very high real-time performance and reliability, and its network size as well as the performance is better than others. This paper introduces the characteristics and latest development status as well as the technical approach of SFODB up to now. It is suggested that an spacecraft internal data bus should be designed as the backbone data network architecture based on SFODB, such as for the satellites and other spacecrafts. The network can complete spacecraft internal reliable data transmission with hierarchical classification for payload. Finally, we give some guidance for research and application of SFODB in the future, some highly reliable design concepts about internal bus in spacecraft may refer SFODB.
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