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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。
In order to improve the transmission bandwidth of digital video image information in space CCD camera, enhance the anti-electromagnetic interference ability of image transmission and improve the overall performance of optical fiber link, the digital video image information high reliability optical fiber transmission system for large-field space camera has been developed. First of all, based on the characteristics of CCD imaging unit and the working environment of the camera on the track, the input rate of the transmission system is obtained. Based on this, the 9-channel CCD parallel data transmission system is designed and implemented based on CCD video processing structure. Then, the system design idea is explained, and the design concept of high-speed serializer and optical module is illustrated. Then, a (16,8) error correction coding algorithm is proposed, and the idea of the algorithm and the implementation circuit are described. Finally, the experimental verification was carried out on the transmission system of XX-X multi-spectral camera prototype. The experimental results show that the transmission system has the advantages of correct image transmission, stable operation, high reliability, strong real-time, error-free and single data rate of 2.44Gbit / s. (16,8) error correction coding algorithm error correction capability, easy to implement hardware, less resource consumption. Error correction algorithm can correct 191bit error within 3043Byte. The transmission system meets the space camera image transmission requirements.