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为分析高空紫外光通信性能,建立了高空太阳辐射分布模型;研究了不同波长紫外光的高空散射系数和吸收系数;考虑太阳辐射的背景光和接收端散粒噪声,对紫外光直视与非直视链路的损耗和信噪比进行了仿真分析。结果表明:在高空30km以下,由太阳辐射产生的背景光远小于接收端散粒噪声;在7km的高度上280nm的信号光可实现距离为5km、速率为10Mb/s的直视通信和距离1km、速率50kb/s、收发端仰角为20°的非直视通信。直视与非直视通信可以通过选择波长在“日盲区”两端的信号来减小臭氧对紫外光的吸收作用,提高信噪比;非直视通信还可以选择“日盲区”波长短的信号来增强散射效应,改善通信性能。
In order to analyze the performance of high-altitude ultraviolet communication, a model for the distribution of solar radiation at high altitude was established. The high-altitude scattering coefficients and absorption coefficients of ultraviolet light with different wavelengths were studied. Considering the background noise of the solar radiation and the shot noise of the receiving end, Direct link loss and signal to noise ratio were simulated. The results show that under the altitude of 30km, the background light produced by solar radiation is far less than the shot noise of the receiving end. The 280nm signal light at a height of 7km can achieve direct communication with a distance of 5km and a rate of 10Mb / s, , The rate of 50kb / s, receiver end elevation of 20 ° non-direct-view communications. Direct and non-direct communication can be selected by the wavelength of the “blind zone” at the ends of the signal to reduce the ozone absorption of ultraviolet light to improve signal to noise ratio; non-direct-view communication can also choose “blind zone” Short wavelength signal to enhance the scattering effect, improve communication performance.