低轨卫星网络支持飞机用户的切换管理算法

摘要

To solve the problem of supporting aeronautical users to access satellite network of Low Earth Orbit (LEO) seamlessly, a novel handover algorithm based on dynamic Doppler shift was proposed. After analyzing the characteristic of satellite coverage for the grounded users with low velocity, the inter-satellite handover algorithm for aeronautical users covered by LEO satellites was researched in-depth, concerning the high velocity movement of users and the satellite. After detailed demonstration of the principal and process of the handover, the mathematical expressions of the time and position of aeronautic users when handover happens were derived out by establishing the mathematical model. Finally, with the Teledesic-like satellite system as an example, the authors analyzed the effect of the selection of time-to-handover on the performance of the system and its quality of service through the simulation, so that the validity of this algorithm was proved.%为解决低轨道卫星通信系统支持高速飞行的飞机用户无缝接入问题,基于动态多普勒频移技术,提出一种支持高速飞机用户的卫星网络切换管理算法.在分析低轨道卫星网络覆盖地面低速用户特性的基础上,针对飞机用户高速运动和卫星自身高速移动的特点,就处于低轨卫星覆盖下的飞机用户进行星间切换的管理算法深入分析,对算法原理及切换过程进行详细的阐述,并通过建立数学模型推导出飞机用户发生卫星切换的时刻和位置的数学表达式.最后,以类Teledesic系统为例,就该算法中切换门限值的选取对卫星系统性能及服务质量的影响进行仿真分析,证明了该算法的有效性.