降雨背景下量子定位系统中最优平均光子数自适应策略  

Adaptive Strategy for Optimal Average Photon Number in Quantum Positioning System Under Rainfall Background

作　　者：聂敏 高婷 杨光 张美玲 孙爱晶 裴昌幸[3] Nie Min;Gao Ting;Yang Guang;Zhang Meiling;Sun Aijing;Pei Changxing(School of Communications and Information Engineering,Xi'an University of Posts and Telecommunications,Xi’an,Shaanxi 710121,China;School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an,Shaanxi 710121,China;State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an,Shaanxi 710071,China)

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710121 [2]西安邮电大学电子工程学院,陕西西安710121 [3]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《光学学报》2022年第3期246-253,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61971348,61201194);陕西省国际科技合作与交流计划项目(2015KW-013);陕西省自然科学基础研究计划项目(2021JM-464)。

摘　　要：量子定位系统(QPS)是一种高精度且安全的定位系统,光子数的变化会对定位误差和安全性造成很大影响。为了降低降雨天气下系统的定位误差并提高系统的安全性能,基于诱骗态量子密钥分配协议和最优平均光子数自适应(PNA)算法,提出了抵抗降雨干扰的QPS诱骗态自适应调整策略。建立了降雨强度、传输距离与最优平均光子数间的自适应关系,对自适应调整前后的定位误差和安全密钥生成率进行了对比。仿真结果表明,当降雨强度为10 mm/h,传输距离为10 km时,采用PNA算法后,系统定位误差由13.81 cm减小到1.13 cm;当降雨强度为1.47 mm/h,传输距离为25 km时,采用PNA算法后,系统的安全密钥生成率由5.5×10^(-4)提高到6.3×10^(-4)。由此可见,通过自适应调整系统每脉冲所含平均光子数,可以提高QPS在降雨天气下的可靠性。Quantum positioning system(QPS)is a high precision and safe positioning system.The change of photon number has a great impact on the positioning error and security.In order to reduce the positioning error and improve the safety performance of the system in rainy weather,based on the decoy state quantum key distribution protocol and the optimal average photon number adaptive(PNA)algorithm,an adaptive adjustment strategy of QPS decoy state against rainfall interference is proposed.The adaptive relationship among rainfall intensity,transmission distance and the optimal average photon number is established,and the positioning error and the security key generation rate before and after adaptive adjustment are compared.The simulation results show that when the rainfall intensity is 10 mm/h and the transmission distance is 10 km,the system positioning error decreases from 13.81 cm to 1.13 cm by using PNA algorithm.When the rainfall intensity is 1.47 mm/h and the transmission distance is 25 km,the security key generation rate of the system is improved from 5.5×10^(-4)to 6.3×10^(-4)by using PNA algorithm.It can be seen that the reliability of QPS in rainy weather can be improved by adaptively adjusting the average number of photons per pulse of the system.

关 键 词：量子光学 量子定位系统 降雨 平均光子数 自适应 

分 类 号：G301[文化科学]