星间链路网络高效组网与传输协议研究

发布时间：2019-02-26 16:06

【摘要】：星间链路是解决导航卫星星座地面站位置与数量受限的极佳途径,是导航系统发展的必然趋势。而导航卫星星座拓扑结构复杂,具有时变空变的特点,需求和边界条件众多,如何规划与调度星间链路相关资源是关系着星间链路能否发挥功能的关键所在。本文就星间链路的组网与传输协议相关理论与技术展开研究,研究方向具有良好的前瞻性,内容与成果对导航星座星间链路网络的建设具有一定的指导意义。本文的主要研究内容可概括为如下几个方面:1.导航星座星间链路网络基本模型的建立。基本模型包括星间链路网络的基本需求模型,建链拓扑模型以及网络协议模型。具体内容包含星间链路网络的应用模式,拓扑属性及可见性的分析,链路代价分析等。2.基于STDMA接入模式下的星间链路网络时隙规划设计。本文根据星间链路的数据传输模式,提出了一种基于星间可见性与通信测量性能的“非时变链路+时变链路”的时隙规划设计方案,并给出了卫星故障下的规划调整方案。3.面向导航星座信息的数据传输协议的设计,本文结合传统地面网络协议TCP与标准空间传输协议SCPS-TP,针对本文所处的特殊应用背景下,对传输层协议的各项功能进行了设计,提出了一种SNACK改进方案——倒序SNACK应答机制,并给出了传输层协议的帧格式和数据处理流程。4.最后为了验证设计方案的合理性与可行性,对所建立模型与设计内容进行的仿真实验,从不同的角度详细分析了在不同条件下的建链规划与网络传输的性能,最终得到的星间链路网络其平均通信时延约为600ms,网络吞吐率可在高速率高误码率(100kbps,10-4)的状态下依旧维持在最佳状态的80%左右,所设计的星间链路网络能够满足当前导航卫星星座的应用需要。
[Abstract]:Inter-satellite link is an excellent way to solve the limitation of the location and number of ground stations in navigation satellite constellation, and it is the inevitable trend of the development of navigation system. However, the topological structure of navigation satellite constellation is complex, it has the characteristics of time-varying space variation, and there are many requirements and boundary conditions. How to plan and schedule the related resources of inter-satellite link is the key to the function of inter-satellite link. In this paper, the theory and technology of inter-satellite link networking and transmission protocol are studied. The research direction is forward-looking, and the contents and achievements are of great significance to the construction of the inter-satellite link network of navigation constellation. The main contents of this paper can be summarized as follows: 1. The Establishment of the basic Model of Navigation Constellation Inter-satellite Link Network. The basic model includes the basic requirement model, the link topology model and the network protocol model of the inter-satellite link network. The specific contents include the application pattern of inter-satellite link network, the analysis of topology attribute and visibility, the analysis of link cost, etc. Time slot planning design of inter-satellite link network based on STDMA access mode. According to the data transmission mode of inter-satellite link, this paper presents a time slot planning and design scheme of "time-varying link" based on inter-satellite visibility and communication measurement performance, and presents the planning and adjustment scheme under satellite fault. 3. Based on the design of data transmission protocol for navigation constellation information, this paper designs the functions of transport layer protocol based on traditional terrestrial network protocol TCP and standard space transmission protocol SCPS-TP, aiming at the special application background of this paper. In this paper, an improved SNACK scheme-inverted SNACK response mechanism is proposed, and the frame format and data processing flow of transport layer protocol are given. 4. Finally, in order to verify the rationality and feasibility of the design scheme, the simulation experiments of the established model and design contents are carried out, and the performance of chain-building planning and network transmission under different conditions is analyzed in detail from different angles. The average communication delay of the resulting inter-satellite link network is about 600 Ms, and the throughput rate of the network can be maintained at about 80% of the optimal state at a high rate and high bit error rate (100 kbps, 10 kbps), and the average communication delay of the resulting inter-satellite link network is about 600 Ms. The designed inter-satellite link network can meet the needs of the current navigation satellite constellation application.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1

【引证文献】