摘要
针对卫星网星间链路所处的环境暴露、覆盖范围广、用户规模大、极易受干扰的特点,提出了一种具有链路稳定性的星间链路混合路由算法:首先分析星间链路的几何特性,基于Hill方程推导出星间链路距离、俯仰角、方位角;根据卫星之间的相对运动和星座构型,综合分析了链路生存时间、传输时延、空间干扰等问题对星间链路稳定性的影响;然后,以最短路由算法和K短路由算法为基础,提出星间链路权值和链路路由优化准则,进而提出星间链路优化切换的混合路由方案;最后,结合具体的GEO/MEO双层卫星网实例对该方案进行了仿真分析。仿真结果表明混合路由算法的综合服务指标最优。
Against Inter-Satellite Links（ISL）easily interfered for situating in a highly exposed environment,covering a wide range and large-scale users,this article proposd a stability routing strategy.Firstly,the geometric characteristic of ISL was analyzed,with deducing the ISL distance,elevation,azimuth by Hill equation.According to the relative motion between satellites and the constellation configuration,a synthetic routing strategy was put forward to analyze the ISL stability performance by the link survival time,transmission delay and spatial interference.In addition,the ISL power weight and link path optimization criterion was obtained based on the shortest path algorithm and the K-path algorithm.Then,a stability synthetic routing strategy with best switching scheme was proposed.Finally,simulation for specific GEO/MEO satellite network was carried out.The results showed that the synthetic routing strategy would have the optimal hybrid service indicator.
出处
《导航定位学报》
2016年第2期29-35,共7页
Journal of Navigation and Positioning
关键词
星间链路
路由算法
双层卫星网
inter-satellite link
routing strategy
two layer satellite network
