中文摘要：

在构建天地一体化网络时,可使用IP技术实现空地网络互联,但空间数据链路时延较长且易阻断。针对该问题,设计一种空地网络互联模拟系统。在传输层采取分段传输控制协议（TCP）技术提高网络传输性能,利用空地网关实现链路层和传输层的协议转换。基于该系统,测试TCP和空间通信传输协议标准-传输协议的传输速率及支撑各应用服务的性能。实验结果表明,与标准TCP相比,分段TCP技术满足视频、语音等服务的传输性能要求,能有效支持各种应用服务。

英文摘要：

It can use IP technology to realize the space and ground network interconnection for the construction of space and ground integrated network.However,the characteristic of Space Data Link（SDL） is long-delay and easily interrupted.Aiming at this problem,a space and ground network interconnection simulation system is proposed in this paper.In order to improve the transmission performance of network,the segmentation Transmission Control Protocol（TCP） technology is adopted in the transmission layer.Space and ground gateway is used to implement protocol converting at data link layer or transmission layer.Based on this system,this paper tests the TCP and Space Communications Protocol Specification-Transport Protocol（SCPS-TP） transmission speed and performance in supporting some application services.Experimental results show that,compared with TCP protocol,the segmentation TCP technology can meet the transmission performance requirements of video,voice and other services.It can effectively support a variety of application services.