空间CCD相机的高速多通道图像高可靠光纤传输系统

为了提高空间CCD相机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提高光纤链路的整体性能,开发了应用于大视场空间相机的数字视频图像信息高可靠光纤传输系统。首先,根据CCD成像单元特点和相机在轨工作环境得出了传输系统的输入速率,在此基础上并结合CCD视频处理结构设计并实现了9通道CCD图像数据光纤并行传输系统。然后,阐述了系统设计思想,并说明了高速串化器和光模块的设计理念。接着,提出了(16,8)纠错编码算法,阐述了该算法思想和实现电路。最后,在XX-X空间多光谱相机样机的传输系统上进行了试验验证。实验结果表明:该传输系统图像传输正确、工作稳定、可靠性高、实时强、无误码,单路有效数据率达到2.44Gbit/s。(16,8)纠错编码算法纠错能力强、易于硬件实现、占用资源少。纠错算法在3043Byte内可以纠正191bit错误。该传输系统满足了空间相机图像传输的要求。

High speed optical f iber transmission system for multi-channel image in space CCD camera

In order to improve the transmission bandwidth of digital image, the performance of f iber link, and the anti-interference ability of electromagnetic, a high speed optical f iber Transmission system for CCD image was designed in space CCD camera with a large f ield of view. First, the input rate was gained according to the characteristics of CCD imaging unit and the working environment of space camera in orbit, based on which, a 9-channel parallel high speed optical f iber transmission system for multi-channel CCD image was designed. Then, we expounded the system design idea and the principle of high speed serializer and optical module. Then, an error correction algorithm was proposed. And implementation method using very large scale integration (VLSI) was explained for the encoder. Finally, the experiments were performed for transmission system of the prototype in XX-X space multi-spectral camera. The results showed that the transmission system has a high reliability. The correcting algorithm has the characteristics of strong error detecting ability, less resource occupation and easier to be realized with hardware. The method is able to correcting 191 bit errors in 3043 Byte and meets the reliability of image Optical f iber transmission in space camera.