基于定点数据的星地量子通信数据仿真

Data simulation of satellite-ground quantum communication based on fixed point data

实际卫星在轨运动会对星地量子通信实验带来影响。星地间距离的变化导致信号时间间隔改变,进而对量子通信中的时间同步带来干扰,降低成码率甚至无法成码。利用定点量子通信数据仿真星地量子通信数据,可用于卫星发射前检测不同轨道高度下卫星信号的时间同步性能。通过分析时间同步方案模拟了距离变化反映在信号光接收端的时间变动。用星地量子通信实验的实际数据对仿真模型进行了验证,结果表明模型匹配程度较好。

The real orbital movement of satellite has an impact on the satellite-ground quantum commu- nication experiment. The change of satellite-ground distance leads to the change of signal time interval, and thus it affects time synchronization in quantum communication, reduces final key rate and even fails to generate keys. The satellite-ground quantum communication data can be simulated by using the fixed-point quantum communication data, which can be used to detect the time synchronization performance of satellite signals at different orbital heights before satellite launch. By analyzing the time synchronous scheme, the signal light receiving end time variation which reflects the distance change is simulated. The practical data of satellite-ground quantum communication experiment are used to verify the simulation model, and results show that the model matching degree is good.