低轨航天器空地间移动IP切换技术研究

Research of mobile IP handover technology in LEO spacecraft

为解决低轨航天器与各地面基站之间移动IP切换时延大的问题,提出基于轨道信息预测的移动IP切换方案。根据轨道信息和地面基站位置信息事先预测接入地面基站的时刻和接入顺序,定时触发航天器与最合适接入的地面基站之间进行移动IP切换。研究并改进了数据链路层和网络层的切换流程,并通过STK和OPNET结合方式对该方案进行了仿真。实验结果表明,该方案能明显改善低轨航天器的移动IP切换性能。

To reduce high handover latency in mobile IP applied between the spacecraft and the ground stations,a handover scheme of mobile IP based on the orbit information predetermination is proposed.The access time for each station and the access sequence are pre-dicted in advance according to the spacecraft orbit information and the access stations location information,and then trigger the spacecraft accessing to the most appropriate station using mobile IP on time.The handover procedure of the data link layer and the network layer is presented,and the simulation verification is also given with the help of STK and OPNET.Finally,the simulation result shows that the scheme reduce the handover latency.