前向数据接入方式对导航星座网络通信性能的影响分析

对采用时分多址轮询建链体制的导航星座星间链路网络，为了指导星间链路网络地面前向数据接入的应用，分析了不同地面前向数据接入方式的星-星-地联合数据交互机制及其对网络通信性能的影响，并结合应用代价给出了综合评价和使用建议。以前向数据最快路径接入方式和固定节点接入方式为代表，分析了星间链路网络与地面间星 星 地联合数据交互机制的特点，明确了两种方式下星间链路网络拓扑路由规划策略的制定原则。通过构建Walker 24/3/1导航星座星间链路网络数据处理模型及典型星地运行场景，对两种地面前向数据接入方式仿真分析了星间链路通信容量和传输时延等网络通信性能，比较分析了通信容量及数据拥塞规律，得出前向数据最快路径接入方式相比于固定节点接入方式在通信性能上有较明显优势的结论。最后，综合给出了两种星 星 地联合数据交互机制的应用性评价,同时给出了在通信容量较低且通信时延要求不高、但可靠性要求较高的应用条件下，可适度采用固定节点接入方式的建议。

Influence of forward data access modes on navigation constellation network communication performanc

The influence of forward data access modes on the time division polling chain built navigation constellation inter satellite link network data interchange mechanism and communication performance was analyzed, based on which the evaluation and suggestion for the current forward data access application were given. Firstly, the satellite-satellite-station data interchange mechanisms of the quickest path and the fixed node forward data access modes were analyzed, and the corresponding topology and routing planning strategy were given. Secondly, based on the data processing models and typical simulation scenarios of the Walker 24/3/1 global navigation constellation and stations, the simulation and analysis of communication performances of capacity and transmission delay was carried out on the quickest path and the fixed node access modes, and the characteristics of network communication performance and data congestion on the two modes were compared. It is concluded that the quickest path mode has obvious advantages over the fixed node mode in communication performance. Lastly, the advantages and prices for application of the two data interaction mechanisms were evaluated, and the suggestion on proper application of the fixed node forward data access mode was given under the conditions of low communication capacity, low communication delay and high reliability.