DTN协议在空间信息网络中的应用研究

Research on Application of DTN in Space Information Network

针对空间信息网络具有的子网异构、拓扑易变、链路传输延迟大、误码率高等特点,研究了适用于其中的延迟/中断容忍网络(Delay/Disruption Tolerant Network,DTN)协议。首先阐述了CCSDS DTN协议应用于空间网络互联服务的体系结构,介绍了当前支撑空间DTN应用的Bundle、LTP等多种主要的空间信息传输协议及其特性。针对我国空间信息网络的特点,分析了我国现阶段对CCSDS DTN协议体系的应用需求,提出了适于我国实际的基于CCSDS DTN的空间信息网络协议体系设计构想,同时给出了火星探测场景实例;最后搭建了网络实验仿真平台,用以验证分析DTN相关协议在空间通信中的有效性和优越性。仿真效果直观可信,可为我国空间信息网络建设提供仿真依据和理论参考。

To cope with the characteristics of heterogeneous subnet,variable topology,large link transmission delay, and high bit error rate in space information network, the paper investigates the applicable Delay/Disruption Tolerant Network （DTN） Protocol. It describes CCSDS DTN architecture applied to space network interconnection service at first, and introduces various main space information transmission protocols and their characteristics such as Bundle and LTP that support space DTN applications. Focusing on the characteristics of space information network in China, the paper analyzes current application needs for CCSDS DTN protocol architecture,and proposes an idea of space information network protocol architecture design based on CCSDS DTN, which is regarded as adapting to our country＇s present situation, and gives a Mar exploration scenario. Finally,the network simulation platform is founded to verify the effectiveness and advantage of some representative DTN protocols. The simulation result shows its visual and receivable, which can be used as a reference for building space information network in China.