天基信息实时智能服务系统仿真评估研究

Simulation and Evaluation of Real-Time and Intelligent Space-Based Information Service System of China

天基信息实时智能服务系统(PNTRC)是多星协同、多网互联的下一代天基信息系统,将广泛应用在卫星通信、导航、遥感等领域。本文针对PNTRC建模仿真和效能评估展开研究,分析了系统评估仿真的必要性、需求以及发展趋势,进而支撑PNTRC顶层设计和实施方案论证。针对PNTRC动态时变、业务多样、异质异构的特性,对场景可扩展的高效分布式仿真、时空动态分析评估方法、系统体系化建模等关键技术展开详细讨论。基于分布式仿真评估系统,以高分辨率对地遥感业务为例,对比和评估了多个低轨通信星座对遥感业务的传输支持能力。研究结果表明,在遥感业务数据传输过程中,覆盖密集的OneWeb星座卫星具有更小的网络时延、丢包以及更高的容量和稳定性,但单星容量反而不及覆盖密度较小的"虹云""鸿雁"星座。本文研究为我国PNTRC可行性论证与工程建设提供了方法和技术手段支撑。

The real-time and intelligent space-based information service system is a next-generation space-based information system featuring multi-satellite coordination and multi-network interconnection. It will be widely used in satellite communications, navigation, and remote sensing. To support the top-level design and construction of the real-time and intelligent space-based information service system, this paper studies the modeling simulation and performance evaluation of the system, and analyzes the necessity, requirements, and development trends of system simulation and evaluation. The key technologies such as scalable and efficient distributed simulation, spatial-temporal dynamic evaluation, and systematic modeling are discussed, considering the characteristics of the system, such as dynamic time-varying, diverse business, and heterogeneity. Based on the design of the distributed simulation and evaluation system, the transmission support capabilities of different low-orbit communication satellite systems are compared and evaluated, taking high-resolution remote sensing as an example. The results show that during the remote sensing data transmission process, the OneWeb satellite constellation has smaller delay, less packet loss, and higher capacity and stability, owing to its dense coverage;however, its capacity per satellite is inferior to that of the Hongyun satellite constellation which has a smaller coverage density. This study can provide technical supports for the feasibility evaluation and construction of the real-time and intelligent space-based information service system.