基于大气折射效应的星地背景光误码率分析

Analysis of Bit Error Rate of Satellite-to-Ground Background Light Based on Atmospheric Refraction Effect

摘要:

研究了大气折射效应对星地量子密钥分发(QKD)系统的背景光误码率的影响,研究过程中考虑了白天晴天、满月夜晚和无月夜晚三种不同的背景光条件。建立了分层结构的星地QKD信道传输模型,模拟大气折射效应对信号传输距离的影响；基于此模型仿真分析了考虑和忽略大气折射效应时只考虑背景光的误码率随天顶角的变化趋势。结果表明:忽略大气折射效应将对背景光误码率产生较大的影响,此外在无月夜晚背景光条件下可以获得相对最低的误码率。

Abstract:

The effect of atmospheric refraction on the background light bit error rate of the satellite-to-ground quantum key distribution (QKD) system was studied. Three different background light conditions of sunny day, full moon night, and moonless night were considered. First, a stratified satellite-to-ground QKD channel transmission model was established to simulate the influence of atmospheric refraction effect on the transmission distance. Then based on the model, the bit error rate of the background light varied with the zenith angle was simulated and analyzed for the cases in the presence and absence of the atmospheric refraction effects. The results show that, the atmospheric refraction has a certain impact which should not be neglected on the background light bit error rate. In addition, the relatively lowest bit error rate can be obtained under the moonless night background light condition.