高空间分辨率大视场遥感相机图像的高速高可靠传输系统研究
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摘要
提出一种适于高空间分辨率大视场遥感相机的图像高速高可靠传输系统。首先,分析了TLK2711的通信链路,提出了基于同步控制字的高速串行传输策略;深入分析了噪声对传输可靠性的影响,进而提出(17,16)纠错编码算法,分析了纠错编码在大视场空间相机中应用的可行性;最后,在某大视场TDICCD空间相机样机上进行了系统测试。实验表明,本文系统可以实时传输80路高量化数据,整个系统有效数据吞吐率可达13.02Gbit/s;所提出的(17,16)纠错编码算法纠错能力强,运算速度快,易于硬件实现,每512Byte数据可纠正32bit的错误,提高了空间相机高速串行传输的可靠性;系统在不同的传输速度下工作均表现出令人满意的效果。
A high speed and high reliability transmission system applicable to the high resolution and large field time delay and integration charge-coupled device(TDICCD)camera is proposed.First,this paper analyzes the communication link TLK2711 and presents a high-speed serial transmission strategy based on synchronous control word.Then,the(17,16)error correction coding algorithm is put forward on basis of the in-depth analysis of the impact of noise on the transmission reliability.The thought and correction theory of the proposed algorithm is explained and its feasibility of application for large field space camera is demonstrated.This algorithm is tested on a multi-spectral space camera and the results show that the system can achieve the transmission of 80 route data with the effective data throughput of up to13.02Gbit/s for the whole system.It is verified that the(17,16)error correction coding algorithm has the characteristics of strong correction ability,high calculation speed and easy implementation in hardware.It improves the reliability of space camera high-speed serial transmission with the ability that each512 byte data can correct as many as 32 bit errors.In conclusion,the system has obtained satisfactory effect under different transmission speeds with good portability,which is able to meet the real-time,highspeed and reliable image transmission requirements for the high spatial resolution TDICCD camera with large field of view.
A high speed and high reliability transmission system applicable to the high resolution and large field time delay and integration charge-coupled device(TDICCD)camera is proposed.First,this paper analyzes the communication link TLK2711 and presents a high-speed serial transmission strategy based on synchronous control word.Then,the(17,16)error correction coding algorithm is put forward on basis of the in-depth analysis of the impact of noise on the transmission reliability.The thought and correction theory of the proposed algorithm is explained and its feasibility of application for large field space camera is demonstrated.This algorithm is tested on a multi-spectral space camera and the results show that the system can achieve the transmission of 80 route data with the effective data throughput of up to13.02Gbit/s for the whole system.It is verified that the(17,16)error correction coding algorithm has the characteristics of strong correction ability,high calculation speed and easy implementation in hardware.It improves the reliability of space camera high-speed serial transmission with the ability that each512 byte data can correct as many as 32 bit errors.In conclusion,the system has obtained satisfactory effect under different transmission speeds with good portability,which is able to meet the real-time,highspeed and reliable image transmission requirements for the high spatial resolution TDICCD camera with large field of view.
引文
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[2]WANG Guo-liang,LIU Jin-guo,LONG Ke-hui,et al.Influence of image motion on image quality of off-axis TMA aerospace mapping camera[J].Opt.Precision Eng.,2014,22(3):806-813.王国良,刘金国,龙科慧,等.离轴三反航天测绘相机像移对成像质量的影响[J].光学精密工程,2014,22(3):806-813.
[3]NING Yong-hui,GUO Yong-fei.Real-time image processing in TDICCD space mosaic camera[J].Opt.Precision Eng.,2014,22(2):508-516.宁永慧,郭永飞.星上时间延迟积分CCD拼接相机图像的实时处理[J].光学精密工程,2014,22(2):508-516.
[4]SUN Ji-ming,GUO Jiang,SHAO Ming-dong,et al.Precise focusing for TDICCD camera with wide field of view[J].Opt.Precision Eng.,2014,22(3):602-607.孙继明,郭疆,邵明东,等.大视场时间延迟积分CCD遥感相机的精密定焦[J].光学精密工程,2014,22(3):602-607.
[5]LI Jin,XING Fei,YOU Zheng.NAND Flash memory ECC based on QC-LDPC for space CCD image[J].Joural of Optoeletronics·Laser,2014,25(8):1598-1605.李进,邢飞,尤政.基于QC-LDPC码的空间CCD图像NAND闪存纠错[J].光电子·激光,2014,25(8):1598-1605.
[6]HU Yan,JIN Guang,CHANG Lin,et al.Image motion matching calculation and imaging validation of TDICCD camera on elliptical orbit[J].Opt.precision Eng.,2014,22(8):2274-2284.胡燕,金光,常琳,等.椭圆轨道TDICCD相机像移匹配计算与成像验证[J].光学精密工程,2014,22(8):2274-2284.
[7]LI Ya-peng,HE Bin,FU Tian-jiao.Design of imaging system of interline area CCD[J].Infrared and Laser Engineering,2014,43(8):2602-2606.李亚鹏,何斌,付天骄.行间转移型面阵CCD成像系统设计[J].红外与激光工程,2014,43(8):2602-2606.
[8]ZHANG Gui-xiang,JIN Guang,ZHENG Liang-liang,et al.Design of high-speed and multi-channel CCD image data processing and transmission system[J].Chinese Journal of Liquid Crystals and Display,2011,26(3):397-403.张贵祥,金光,郑亮亮,等.高速多通道CCD图像数据处理与传输系统设计[J].液晶与显示,2011,26(3):397-403.
[9]LIU Ma-liang,ZHU Zhang-ming,DING Hao-yu,et al.1.6Gbit/s synchronization circuit for high speed digital to analog converters[J].Journal of Beijing University of Posts and Telecommunications,2014,37(4):69-73.刘马良,朱樟明,丁昊宇,等.一种用于高速D/A转换器的1.6 Gbit/s同步电路[J].北京邮电大学学报,2014,37(4):69-73.
[10]NI Jian-jun,LI Tao,WANG Jian-yu.Study of high-speed duplex communication serial data transmission based on TLK2711[J].Electronic Design Engineering,2013,21(10):76-80.倪建军,李涛,王建宇.基于TLK2711的高速串行全双工通信协议研究[J].电子设计工程,2013,21(10):76-80.
[11]MA Xuan,WANG Zi-qiang.Circuit design for transmitter system of 10 Gb/s ser des[J].Microelectronics&Computer,2014,31(2):14-22.马轩,王自强.10 Gb/s串行接口发送端电路的设计[J].微电子学与计算机,2014,31(2):14-22.
[12]Ken-ichi Kitayama,Akihiro Maruta,Yuki Yoshida.Digital coherent technology for optical fiber and radio-over-fiber transmission systems[J].Journal of Lightwave Technology,2015,32(20):3411-3420.
[13]ZHU Hua-tao,PU Tao,FANG Tao,et al.Experiment of optical stealth communication system based on code shift keying-optical code division multiple access technology[J].Acta Optica Sinica,2014,34(9):1-5.朱华涛,蒲涛,方涛,等.基于码移键控-光码分多址技术的光隐匿通信系统实验[J].光学学报,2014,34(9):1-5.
[14]SHI Xiao-feng,CHENG Xiang,CHEN Chao,et al.Optical receiver based on BCD process for plastic optical fiber[J].Opt.Precision Eng.,2014,22(7):1715-1722.史晓凤,程翔,陈朝,等.基于BCD工艺的塑料光纤通信光接收机[J].光学精密工程,2014,22(7):1715-1722.
[15]GONG Zi-bo,LU Xing,SHI Ke-bin,et al.Nonlinear propagation of optical frequency comb and its application in phase noise detection[J].Chinese Optics,2015,8(1):39-44.龚梓博,陆星,施可彬,等.光学频率梳非线性传输及其在相位噪声探测中的应用[J].中国光学,2015,8(1):39-44.
[16]WEI Xue-ming.Researches on the key technologies of the high-speed SERDES interface chip design[D].Chengdu:University of Electronic Science and Technology of China,2012,18-20.韦雪明.高速SERDES接口芯片设计关键技术研究[D].成都:电子科技大学,2012,18-20.
[17]FENG Min,BAI Cheng-lin,BAI Shun-chang.LDPC-OFDM code modulation-based passive optical network[J].Joural of Optoeletronics·Laser,2014,25(4):676-680.冯敏,白成林,白顺昌.基于LDPC-OFDM编码调制的无源光网络[J].光电子·激光,2014,25(4):676-680.
[18]HUANG Sheng,HE Li,LIANG Tian-yu,et al.A novel scheme of the random interleaved concatenated code in optical communication systems[J].Joural of Optoeletronics·Laser,2013,24(4):692-697.黄胜,何丽,梁天宇,等.光通信系统中一种新颖的随机交织型级联码方案[J].光电子·激光,2013,24(4):692-697.