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。

According to characteristics of wireless ultraviolet communications and channel model of the helicopter landing process, a method of wireless ultraviolet communication to assist helicopter landing system is designed with LED array structures. Based on the ultraviolet propagation characteristics in real space, the performance differences of wireless ultraviolet communication at various transmitting elevations and receiving elevations are explored in terms of path loss and signal-to-noise ratio. The proposed method is verified experimentally with solar blind ultraviolet LEDs and photomultiplier tubes as transmitting and receiving devices, and the path loss and the signal-to-noise ratio in the ultraviolet propagation are obtained. The results show that the performance of line-of-sight communication is the best, the communication performance with elevation lower than 30° is more applicable to actual situations, and that with the elevation higher than 30° degenerates rapidly.