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作 者:耿健 金文[1] 闫新峰[1] 赵雅琴 房伟红 Geng Jian;Jin Wen;Yan Xin-feng;Zhao Ya-qin;Fang Wei-hong(Beijing Institute of Space Long March Vehicle,Beijing,100076)
出 处:《导弹与航天运载技术》2020年第5期103-108,共6页Missiles and Space Vehicles
基 金:航天科技集团钱学森青年创新基金。
摘 要:天地量子密钥分发技术逐渐成为航天信息系统前沿技术中的研究热点。通过构建仿真模型,分析评估基于BB84协议的星地下行量子密钥分发链路在太阳同步卫星轨道(Low Earth Orbit,LEO)和Walker星座下的性能。考虑了收发端使用反射望远镜、光路存在偏振极化误差和指向误差等非理想因素下的光路模型和有限长度安全密钥的计算。仿真结果表明,尽管单个卫星单次过境所能分发的密钥长度随轨道高度的增加以较缓慢的趋势下降,但是较低轨道的卫星星座仍更适合实现高速的量子卫星量子密钥分发系统。此外,将地面站部署于多颗卫星交汇点的下方,对提升星地间的密钥交换能力有显著作用。The space quantum key distribution has gradually become a hot topic in the frontier of space information technology.A simulation model is built to evaluate the performance of the downlink quantum key distribution based on the BB84 protocol under the scenarios of LEO solar synchronous satellites and Walker satellite constellation.Non-ideal factors of the optical path,such as reflector telescope,polarization error and pointing error,are considered in the simulation model as well as the calculation of the finite security key length.The simulation results show that although the key length distributed by a single satellite decreases slowly with the increase of its orbital altitude,the satellite constellations in lower orbit are more suitable for the high-speed quantum key distribution systems.In addition,deploying the ground stations below the intersection area of multiple satellites orbit planes has significant effect on improving the key exchange capability between satellites and the ground.
分 类 号:TN927[电子电信—通信与信息系统]
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