全彩发光二极管交通诱导屏光纤传输系统

设计了光纤传输系统以实现交通诱导屏图像数据的远距离实时传输。针对原光端机的诸多缺点,提出了传输系统的设计方案,构建了完整的系统结构。依据以太网相关传输协议对物理层和数据链路层的设计思想进行了分析,给出了系统中重要模块的设计方法,并对内存寻址和带宽估计进行了精确计算。测试结果表明:利用单芯光纤可完成最大分辨率为1 024pixel×768pixel,刷新频率为60Hz的图像源的实时传输,最大传输速率达1.5Gbps,距离为5～10km。与原传输方案相比,该方案减少了额外光端机设备,光纤利用率提高了80%,并利用接收端级联减少了光纤铺设成本。系统能够满足城市交通指挥中心对诱导屏实时信号的传输要求,传输性能可靠,已应用于现行交通诱导系统中。

Full-color LED display of traffic guidance fiber transmission system

An optical fiber transmission system was designed to implement the long-distance and real-time transmission of traffic guidance image data. To overcome the defects of traditional optical terminal machines,a complete system architecture was built according to the needs of the transmission system. The design ideas of a physical layer and a data link layer were analyzed based on Ethernet relative protocol, some design principles of the important modules were also given,then the memory addressing and bandwidth estimation were calculated in details. The test results show that the image data with a maximum resolution of 1 024 pixel×768 pixel, and refresh rate of 60 Hz can be transferred in a single optical fiber in real-time with a maximum transmission rate of 1.5 Gbps and the distance of 5-10 km. Compared to the original system,the proposed system reduces additional optical equipment and the fiber utilization rate is increased by 80%. Moreover,the cascade function of the receiver end has reduced the laying costs.With reliable performance, the system can implement the transmission task of real-time image data from a traffic command center to the guidance LED display in most of the cities.