基于用户位置的低轨卫星波束关闭策略

Low Orbit Satellite Beam Shut-off Strategy Based on User Location

由于多波束低轨卫星网络具有网络拓扑动态变化、高纬度地区存在波束重叠覆盖现象等特点,可能会引发严重的乒乓切换效应及大量的波束资源浪费。针对该问题,首先设计了卫星星座及多波束天线,建立了低轨卫星网络的覆盖模型,对卫星波束覆盖优化问题进行模拟和分析;其次,基于低轨卫星点波束覆盖、用户位置等约束,以最小化开启卫星波束为目标,提出基于波束覆盖及基于用户位置的波束关闭策略。仿真结果表明,该波束关闭策略在节约大量波束资源、保证系统可靠性的基础上,能够有效减少用户切换次数及降低乒乓切换率。

Due to the network topology changes and the overlapping beams coverage in high latitudes,multi-beam low-orbit satellite network may lead to serious ping-pong switching effect and waste of a large number of beam resources.In response to this problem,a satellite constellation and multi-beam antenna were designed and a low-orbit satellite network coverage model was established to simulate and analyze the satellite beam coverage optimization problem.Based on constraints such as low-orbit satellite spot beam coverage and user location and with the goal of minimizing the opening of satellite beams,a beam shut-off strategy based on beam coverage and user location is proposed.Simulation results show that the beam shut-off strategy can effectively reduce the number of user handovers and the ping-pong handover rate on the basis of saving a lot of beam resources and ensuring system reliability.