| As a research hotspot in the current aerospace field,space-ground integrated network makes full use of modern information network technology,transmits and processes the acquired multidimensional information on the basis of satellite communication network,and converges and distributes resources to provide real-time,stable,safe and reliable information infrastructure and decision system with on-demand service for various users.However,on the one hand,the current mainstream network simulation software(OPNET,NS,etc.)can not directly use the actual target network protocol and its upper layer application code.On the other hand,space-ground integrated network physical test platform construction costs are high,can not be as convenient,fast and flexible as the software emulation method to configure the test scenarios,test efficiency is low,it is urgent to establish a cost control,easy to expand,scalability,high efficiency of the integration of space-ground integrated network emulation test environment,which is used to promoting the research and development of space-ground integrated network.Based on the current cutting-edge technologies in the field of ICT(cloud computing,network traffic control,software-defined network,etc.),this paper innovatively designs and constructs a emulation and test system for space-ground integrated network to realize the dynamic link emulation of space-ground integrated network.Specifically,according to the test scale requirements and technical specifications of space-ground integrated network emulation,the thesis designs and realizes the emulation test cloud which is easy to deploy,strong expansibility and high efficiency in space-ground integrated network.Considering the complexity of the links and the high accuracy of the emulation results,this paper designs the link model and uses the network traffic control technology to realize the accurate emulation of space-ground integrated network link.At the same time,becaues the topology of space-ground integrated network changes frequently,based on the idea of software-defined network,the paper separates the control level from the forwarding level of the network,unified management of the network equipment,simplifies the network configuration,and realizes the time-varying topology emulation of space-ground integrated network.The paper uses the network testing tool,through designing case of emulation target scene,has carried on the function verification and the performance evaluation to the system.The research shows that the dynamic link emulation of space-ground integrated network,being an important part of the simulation test cloud,can effectively and reliably emulate the dynamic link of space-ground integrated network. |
