层积云背景下量子干涉雷达最优平均光子数自适应策略

Adaptive strategy for optimal average photon number in quantum interference radar in the background of stratocumulus

量子干涉雷达(Quantum Interference Radar,QIR)是以量子力学为基础,利用量子纠缠效应进行目标探测的一种新型雷达体制,QIR探测光子数的变化会对雷达分辨率和系统生存函数产生影响。为了降低层积云液态水含量对QIR探测性能的影响,提出了基于诱骗态量子密钥协议的最优平均光子数自适应(Photon Number Adaptive,PNA)调整策略。建立了层积云液态水含量、传输距离与最优平均光子数之间的关系,对自适应调整前后的QIR分辨率和信道生存函数进行了比较。理论分析和仿真结果表明,当脉冲信号波长一定,层积云粒子浓度为1.579×10^(4)cm^(-3),层积云液态水含量为0.5 g/cm3时,采用PNA策略之后,QIR角度分辨率值由1.289下降至1.028,QIR系统角度分辨率和空间分辨率均得到有效提高;当层积云液态水含量为0.1034 g/cm^(3)时,采用PNA策略之后,信道生存函数由0.2292提高到0.4167。因此,通过PNA策略自适应地调整系统发送端信号脉冲所含的平均光子数,能够提高QIR在层积云背景下探测的可靠性。

Quantum Interference Radar(QIR)is a new radar regime based on quantum mechanics and exploits the quantum entanglement effect for target detection,and the variation in the number of photons detected by QIR has an impact on the radar resolution and system survival function.In order to reduce the influence of the liquid water content of stratocumulus on the detection performance of the QIR system,the optimal average photon number adaptive algorithm(Photon Number Adaptive Algorithm,PNA)based on the decoy state quantum key protocol is proposed.The relationship between the liquid water content of the stratocumulus,the transmission distance and the optimal average photon number is established,and the QIR resolution and the system survival function before and after the adaptive adjustment are compared.The theoretical analysis and simulation results show that when the pulse wavelength is fixed,the stratocumulus particle concentration is 1.579×10^(4)cm^(-3),and the stratocumulus liquid water content is 0.5 g/cm3,the QIR angular resolution decreases from 1.289 to 1.028 after adopting PNA strategy,and both the angular resolution and spatial resolution of the QIR system are effectively improved.when the liquid water content of stratocumulus is 0.1034 g/cm^(3),the channel survival function improves from 0.2292 to 0.4167.Therefore,the reliability of QIR detection in stratocumulus can be improved by adaptively adjusting the average number of photons contained in the signal pulses of the sending end of the system through PNA strategy.