空间光骨干网络是我国空间信息网络的核心。为了对空间光骨干网络中的协议体系、网络架构和关键技术进行可行性验证, 开发了基于OPNET和STK(satellite tool kit, 卫星工具包)联合的空间光骨干网络仿真平台。设计了由4颗GEO卫星组成的天基骨干网、由10颗LEO卫星组成的天基接入网; 开发了由物理层到应用层的光网络协议仿真模型和LEO、GEO、地面站3种节点进程模型, 对光骨干网络进行了仿真测试。仿真结果表明: 空间光骨干网络最大时延为5.48 s, 最小为0.35 s, 网络全局平均时延为1.06 s, 地面站实时吞吐量最大值为0.88 Gb/s, 最小为0.3 Gb/s, 证明该平台可准确模拟空间光骨干网络功能, 满足空间业务高效传输的需求, 为空间光骨干网络性能验证提供仿真平台支持。

The space optical backbone network is the core of China’s spacial information network. In order to verify the feasibility of the network protocol, the network architecture and the key technologies in the space optical backbone network, a space optical backbone network simulation platform based on OPNET and satellite tool kit( STK) was designed.A space-based backbone network consisting of 4 geostationary earth orbit (GEO) satellites and a space-based access network consisting of 10 low earth orbit (LEO) satellites were designed.And the optical network protocol simulation model from the physical layer to the application layer and the 3 node process models of LEO, GEO and ground stations were developed, moreover, the optical backbone network was simulated and tested. The simulation results show that the maximum delay of the space optical backbone network is 5.48 s, the minimum is 0.35 s, and the global average network delay is 1.06 s. The maximum real-time throughput of the ground station is 0.88 Gbps with a minimum of 0.3 Gbps. The research results indicate that the platform can accurately simulate the function of spatial optical backbone network, meet the needs of efficient transmission of space services, and provide simulation platform support for spatial optical backbone network performance verification.