摘要
为了研究高度不同的卫星通信网络的路由和切换性能,采用Walkerdelta型星座构成两种非静止轨道卫星通信系统,分析和比较了LEO和MEO卫星通信网络构成特点和星间链路的俯仰角、方位角和星间链路长度变化。采用不同的路由策略以满足不同服务质量的要求,分析该策略下的卫星网络性能。设计了一种混合路由策略,综合考虑时延、时延抖动、切换和通信中断4项指标,进而比较不同高度的两种卫星网络应用不同路由策略时的性能。结果表明,混合路由策略上述服务质量的综合指标最优,该策略能够为各种用户提供不同的服务质量,提高卫星通信系统有效性和可靠性。
Walker delta type constellation is an excellent candidate to compose non-geostationary orbit satellite communication networks. LEO and MEO satellite networks have many characteristics respectively and the elevation angle, azimuth angle and length of ISLs in these two systems are studied especially. Using different routing strategies in order to fulfill different QoS requirements, the two systems behave differentially. A synthetic routing strategy is put forward to analyze delay, delay jitter, handoff and termination of call synthetically in LEO/MEO systems. And the synthetic routing strategy performs better than other four routing strategies if considering the requirements together. So this kind of routing strategy can be used to provide various qualities of services, and improve the validity and rdiability of satellite communication systems.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2005年第7期1145-1153,共9页
Systems Engineering and Electronics
基金
国家"863"高技术计划资助课题(863-2-5-2.1)
