光电跟踪设备数字视频图像信息光纤传输系统设计

为提高光电跟踪设备中数字视频图像信息的传输带宽,增强图像传输抗电磁干扰能力并减轻导电环配线工作量,开发了应用于光电跟踪设备的数字视频图像信息光纤传输系统。利用光纤传输抗干扰性强、带宽高等优势改善了数字视频图像信息的传输质量,增大了数据传输的容量。在发送端将并行的数字视频信息串行化,提供给光纤模块,电信号转换为光信号,通过光纤传输到接收端;在接收端光纤模块将光信号还原为高速的电信号,再经解串行化还原为原有的数据格式。场同步、行同步以及数据信息组合传输,经处理的时钟信号作为全局时钟单独传输。实验结果表明:利用光纤传输高速数字视频信息,图像正确,带宽达到1.25 Gbit,相机时钟频率可达62.5 MHz,数据传输延时为222 ns左右,最大为236 ns,时钟信号的边沿可对齐数据的有效位置。

Design of digital video signal fiber transmission system in optic-electronic tracker

To improve the bandwidth of digital video transmission of an optic-electronic tracker, enhance the anti-jamming performance of the system and ease the workload of a slip-ring, a fiber transmission system for high-speed digital video image signals was designed. By making use of the anti-jamming and high bandwidth characteristics of the fiber data transmission technology, the image transmission quality was improved and the transmission capacity was enlarged. At the sending end, the parallel digital video signals were serialized and the serial data were transferred into optical signals by a fiber module. At the receiving end, the optical signals were transferred back into the electronic signals by another fiber module, and the serial data were de-serialized back to the parallel data format. The frame signals, line signals and data signals were transmitted together and the processed clock signals were transmitted separately as system clock signals. Experiment results indicate that the image signals can be correctly transmitted by the fiber transmission system, and the bandwidth and the clock frequency have been up to 1.25 Gbit and 62.5 MHz, respectively. Furthermore, the data transmission latency of the system is less than 236 ns, and the clock edge can be located at the valid data position.