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针对无线紫外光通信特点及直升机降落过程中的信道特征,设计无线紫外光通信方法,利用LED阵列结构,实现对直升机的降落区域引导及空地紫外光通信。基于紫外光在真实空间的传输特点,从路径损耗、信噪比等方面探索无线紫外光通信在不同收发仰角条件下的性能差异。使用日盲紫外光LED光源及光电倍增管作为收发器件,对提出方法进行实验验证,获得不同收发仰角条件下紫外光传输的路径损耗及信噪比。直视通信性能最佳,收发仰角在30°以内的通信性能更适用于实际情况,收发仰角大于30°时通信性能快速下降。
Aiming at the characteristics of wireless ultraviolet communication and the characteristics of the helicopter during landing, the wireless ultraviolet communication method is designed. By using the LED array structure, the helicopter’s landing area is guided and the space ultraviolet communication is realized. Based on the transmission characteristics of ultraviolet light in real space, this paper explores the performance difference of wireless ultraviolet communication under different transmitting and receiving elevation angles from the aspects of path loss and signal to noise ratio. Using solar-blind UV LED light source and photomultiplier tube as the transceiver device, the proposed method is experimentally verified to obtain the path loss and the signal-to-noise ratio of the UV light transmission under different transmitting and receiving elevation angles. Direct communication performance of the best, send and receive elevation below 30 ° communication performance is more applicable to the actual situation, send and receive when the elevation angle is greater than 30 °, the rapid decline in communication performance.