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研究了星间链路(ISL)约束及区域不均匀性对LEO移动通信星座的路由时延和呼叫阻塞概率(CBP)的影响。构建了完整而精确的LEO移动通信星座模型。考虑星间链路约束,完成了星间可视计算,得到了星间链路表和链路时延;从覆盖区域和覆盖时间两方面考虑区域不均匀性,完成了星座覆盖计算,并提出了一种根据星座覆盖估算链路呼叫阻塞的方法;利用改进的遗传算法(GA)完成了路由时延和呼叫阻塞的同时优化,得到了最佳路由。仿真结果表明:星间链路约束及区域不均匀性影响到路由的有效性和安全性,二者在路由优化中的应用可以大大改善路由的性能。
The influence of interstellar link (ISL) constraints and regional inhomogeneities on the routing delay and call blocking probability (CBP) of LEO mobile communication constellation is studied. Construct a complete and accurate LEO mobile communication constellation model. Considering the constraints of the inter-satellite link, visual calculation of the inter-satellite is completed, and the inter-satellite link list and link delay are obtained. The constellation coverage calculation is completed considering both the coverage area and the coverage time, and the constellation coverage calculation is completed A method of estimating link call blocking based on constellation coverage is proposed. The optimal routing is achieved by using the improved genetic algorithm (GA) while optimizing the routing delay and call blocking. The simulation results show that the constraints of the inter-satellite links and the regional inhomogeneity affect the validity and security of the routing. The application of the two in route optimization can greatly improve the performance of the routing.