摘要
针对北斗导航星座异轨面激光链路通信距离远、多谱勒频移严重、动态变化剧烈、影响通信定位精度的问题,提出了一种考虑通信距离和多谱勒特性的星座拓扑设计和优化方法。建立了北斗全球星座异轨星间链路运动模型,分析了多谱勒频移、多谱勒速度和多谱勒加速度的变化规律;建立了激光链路通信距离优化模型并提出了优化后的拓扑设计方案。仿真结果表明,优化后的拓扑方案能够降低通信成本,同时在保证网络通信时延性能恶化不超过4%的情况下对单星建链数量进行简化,降低了系统建设成本。仿真结果表明,上述方法是一种经济可行的星座拓扑设计方案,为空间信息传输优化提供了参考。
Aiming at the long distance,severe Doppler frequency-shift,and violent dynamic change of laser-inter-satellite-links between different orbit planes,a design and optimization method for Beidou global constellation topology was proposed.A motion mathematical model for inter-satellite-links（ISLs） was established,the changing regulation of Doppler frequency-shift,Doppler velocity and Doppler acceleration was analyzed.Optimization model for ISLs＇ distance was established and an optimized topology solution was proposed.Simulation results show that the optimized topology can reduce the communication cost,and it cuts down ISLs of each satellite from 4 to 3,reducing the construction cost,on the premise that communication delay increases no more than 4%.Therefore,it＇s an economical and viable topology solution.
出处
《计算机仿真》
CSCD
北大核心
2016年第5期111-115,186,共6页
Computer Simulation
关键词
天基光网络
北斗导航星座
激光链路
多谱勒特性
拓扑设计
Space laser satellite network
Beidou navigation constellation
Laser inter-satellite-link
Doppler character
Topology design
