2 ) drawing the outline of the research architecture of modern simulation technology , expounding the relationship between simulation system and simulation environment , the concept of integrated simulation environment was definitely explained . the framework , realizing method , programming environment and running environment of the scene simulation technology were discussed . bringing forward the scene simulation technology based pc , we systematically discussed its basic concept , technology framework , realizing tools , programming environment , running environment , developing scheme , programming model and applied foreground 2 )勾勒出了现代仿真技术的研究体系，阐明了仿真系统与仿真环境的关系，对一体化仿真环境的概念作了细致的说明；论述了视景仿真的技术构成、实现方法、开发环境和运行环境；提出了基于pc机的视景仿真，论述了它的基本概念、技术构成、实现工具、开发环境、运行环境、开发方案、编程模型和应用前景。
However there is no mature simulation model in the field of satellite network transport layer protocol study yet , nor does there exist any tool to achieve the visualization goal of the simulation results of satellite network transport layer protocols . these have limited the development of the research work using simulation approaches 然而，针对卫星网络传输层协议仿真研究的网络仿真模型并不成熟，对于卫星网络仿真结果的可视化实现工具在国内外还没有出现，这些因素都限制了卫星网络传输层协议的仿真研究。
