不同波长紫外光信号在高空大气通信中的性能分析

Analysis of Communication Performance of UV Signals in High Atmosphere with Different Wavelengths

摘要:

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。?更多还原

Abstract:

In order to analyze the performance of UV communication in high atmosphere channel, the solar irradiation distribution model was built. Scattering coefficients and absorption coefficients of UV light with different wavelength were studied. Considering the noise caused by solar irradiation and the receiver, both path loss and SNR were simulated respectively in the condition of UV communication line-of-sight (LOS) link and non-line-of-sight (NLOS) link. The results show that the noise caused by solar irradiation is much less than that of the receiver below 30km in the air. At the wavelength of 280nm and height of 7km, it can realize communication at a range of 5km and rate of 10Mb/s by LOS link, and a range of 1km, rate of 50kb/s and elevations on the transceiver of 20° by NLOS link. A signal with the wavelength at either end of ‘solar-blind’ can decrease ozone absorption and increase SNR, which is suitable for both LOS and NLOS link. In addition, a signal with short wavelength can strengthen scattering, which is of benefit to realize NLOS communication.