误差实时检测的水下LED光通信技术

为降低水下作业环境通信终端安装误差和机动目标指向误差的影响,给出了水下光通信系统架构,提出了一种基于气泡智能剔除的光斑识别定位算法,较好地解决了气泡对水下光通信链路稳定的影响,仿真结果显示该算法具有较好的鲁棒性。结合水下蓝绿光衰减较小的特点,设计了一种6个蓝光450 nm灯珠合束发射方案,提出了一种基于误差参量的链路模型;并在纯海水模拟信道环境下,通过仿真及等效实验表明:对于发射光强为平顶分布,偏轴误差在发散角10以内情况下,经过50 m信道衰减后,接收端接收功率-20 dBm,眼图张开良好;反之,通信性能急剧下降。

Underwater LED optical communication technology of real-time error detection

In order to reduce the influence of error coming from installation of communication terminals and pointing error of maneuvering targets in underwater working environment, the structure of underwater optical communication system was given. The light spot recognition and positioning algorithm based on intelligent bubble elimination was proposed. The effect of bubbles on link stability of underwater optical communication was well solved. The simulation results show that the algorithm has good robustness. Considering the characteristics of low attenuation in blue and green spectrum under water, an emission scheme of six lamps (central wavelength =450 nm) based on beam combination was designed, and a link model based on error parameters was proposed. In the simulation channel environmentof pure sea water, the experimental results show that the receiving power of the receiver was more than -20 dBm through 50 m channel attenuation when the distribution of transmitted light intensity was the flat-top and the divergence angle was less than 10. Meanwhile, the eye diagram opened well. Otherwise, the performance dropped sharply.