水下LED集鱼灯灯载视频系统设计

为实时获取光诱捕捞作业时水下鱼群状态的视频信息,设计了一款水下LED集鱼灯灯载视频系统。该系统在结构设计上以水下LED集鱼灯为载体,在其内部嵌入了一套数字视频解决方案;在信号处理上利用正交频分复用技术(OFDM)对数字视频信号进行调制,以克服电力线上的杂波和电流信号固定脉冲对视频信号的干扰;在通信设计上以电力载波(PLC)方式作为视频信号传输方案。该系统设计完成后,对其信号传输性能进行了测试。结果表明,在电力线标称截面积6 mm2、长度30 m时,系统延时3 ms,丢包率0%,实际传输速率为8 000 Kbps。系统在不改变集鱼灯结构的前提下,添加了视频拍摄功能,且无需单独增设视频传输线,可作为光诱渔船上的辅助渔捞设备使用,也可拓展应用于鱼类行为实验中。

The design of video system loaded in underwater LED fish gathering lamp

In order to obtain the real-time video information of fish in light fishing, a video system loaded in underwater LED fish gathering lamp was designed. In terms of structure design, the underwater LED fish gathering lamp was taken as a carrier, and a set of digital video solution was embedded in it. As to the digital design, orthogonal frequency division multiplexing ( OFDM ) was used to overcome the interference of the clutter and the fixed pulse of current signal in the power line to the video signal. In communication design, power line communication ( PLC) was used as a video signal transmission scheme. The system was tested after design, and the test results showed that, on the condition that the power line’s nominal cross-sectional area is 6 mm2 , and its length is 30 m, the system delay is 3 ms, the packet loss rate of the system is 0%, and the actual transmission rate is 8 000 Kbps. This system, on the condition that it doesn ’ t change the lamp ’ s structure and adds no additional single line, adds the video function to the underwater LED fish gathering lamp, and can be either used as an auxiliary fishing equipment in light fisheries or applied in fish behavior experiment.