Laser Link Assignment of Navigation Satellite Constellations Considering Inter-satellite Ranging and Communication
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摘要: 为在星间可见性、星上激光终端数量及链路体制约束下，实现导航星座基于激光链路的星间高效测距和与地面站通信，建立了导航星座稳态激光星间链路多目标规划模型，提出了基于第二代非支配排序遗传算法（Non-dominated Sorting Genetic Algorithms-II，NSGA-II）的链路拓扑多目标优化算法。通过在稳态优化模型中引入过渡态拓扑边连通度约束，在保证稳态测距和通信性能的同时，实现了过渡态激光链路整网连通。最后进行了全球导航星座激光星间链路规划仿真。NSGA-II生成的拓扑最优解集能够支配多目标模拟退火算法生成的最优解；各链路周期NSGA-II综合最优解对应的稳态激光链路拓扑测距PDOP为1.9～3.2，通信时延为0.14～0.34s；过渡态通信时延为0.14～0.43s。结果表明，所提出的激光链路规划方法能够实现链路稳态下的星间高效测距和通信，同时保证链路过渡态下的星座整网连通和对地通信。
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关键词:
- 导航卫星星座 /
- 激光星间链路 /
- 测距与通信 /
- 边连通度 /
- 第二代非支配排序遗传算法
Abstract: Objectives: Laser Inter-Satellite Links (LISLs) of the navigation constellation was assigned with constraints of inter-satellite visibility, the number of laser terminals and the link system to realize efficient inter-satellite ranging and communication with ground stations. Methods: According to the laser link system, each link period included two states, transition state and steady state. The transition state completed the link switching and reconstruction, and maintained a static link topology when entering the steady state. Based on the static processing, a multi-objective assignment model of steady-state LISL of navigation constellations was established. A multi-objective optimization algorithm for link topology based on Non-dominated Sorting Genetic algorithm-II (NSGA-II) was proposed. By introducing the edge connectivity constraint of the transition topology into the steady-state optimization model, the whole network connectivity in the transition state was realized while ensuring the steady-state ranging and communication performance. Finally, the assignment and simulation of a global navigation constellation LISL were carried out. Results: The optimal solution set generated by NSGA-II could dominate the optimal solution generated by the Multi-Objective Simulated Annealing Algorithm (MOSA). The ranging PDOP of steady-state LISL topologies corresponding to the comprehensive optimal solution of all link periods was 1.9~3.2, and the communication delay was 0.14 ~0.34s. The transition state communication delay ranged from 0.14s to 0.43s. Conclusions: The results demonstrated that the proposed laser link assignment method could realize efficient inter-satellite ranging and communication in steady link states, and ensure the whole constellation network connectivity and satellite-to-earth communication in link transition states. -
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