适于高速CCD图像数据光纤传输的纠错技术

提出了一种适于高速CCD图像数据光纤传输的纠错算法用于提高大视场时间积分延迟(TDI)CCD相机中图像数据传输的可靠性。首先,分析了大视场空间相机图像数据光纤传输特点和光纤信道加性高斯白噪声(AWGN)模型下的数据传输差错,在此基础上提出了(16,8)纠错编码算法。阐述了(16,8)纠错编码算法思想以及纠错原理,说明了(16,8)纠错编码器的超大规模集成电路(VLSI)实现方法和编码器电路。然后,从不同角度分析了(16,8)纠错编码算法在大视场空间相机中应用的可行性。最后,在一空间多光谱相机样机的传输系统上进行了试验验证。结果表明:(16,8)纠错编码算法纠错能力强、易于硬件实现、占用资源少,在3 043Byte内可以纠正191bit错误,编码器资源占用率小于5%。提出的算法提高了空间相机中图像数据光纤传输的可靠性。

Error correction technology for CCD image using high speed optical fiber transmission

An error correction algorithm for CCD images was proposed to improve the reliability of image optical fiber transmission in a Time Delay Integrated(TDI)CCD camera with a large field of view. First, the image optical fiber transmission characteristics for the space camera and data transmission errors in a fiber channel Additive White Gaussian Noise(AWGN) model were analyzed, and a (16, 8) error correction algorithm was proposed. Then, the (16, 8) algorithm idea and error correction principle were described and an implementation method using Very Large Scale Integration(VLSI) and an encoder were explained. Meanwhile, the feasibility of the algorithm for space camera was explained in different aspects. Finally, the experiments were performed for the transmission system of a prototype in a space multispectral camera. The results show that the (16, 8) algorithm has strong error detecting ability, less resource occupied rate and easier to realize with a hardware. The method is able to correct 191 bit errors in 3 043 Byte, and the resource occupied rate for the encoder is less than 5%. In conclusion, the algorithm improves the reliability of image optical fiber transmission in space cameras.