天问一号高分辨率相机高可靠图像存储电子学系统  

High reliability image storage electronics system of Tianwen-1 high-resolution camera

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作  者:何云丰 王栋[1] 王征[1,2] 关海南[1] 张博威 闫得杰[1] HE Yunfeng;WANG Dong;WANG Zheng;GUAN Hainan;ZHANG Bowei;YAN Dejie(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;Key Laboratory of Lunar and Deep Space Exploration,Chinese Academy of Sciences,Beijing 100101,China)

机构地区:[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院月球与深空探测重点实验室,北京100101

出  处:《光学精密工程》2022年第2期160-169,共10页Optics and Precision Engineering

基  金:中国科学院月球与深空探测重点实验室开放基金资助项目(No.LDSE201901)。

摘  要:为了解决天问一号高分辨率相机拍摄时高输出图像数据率与火地间数据传输速率带宽低的问题,设计了一套以NAND Flash为存储介质,以FPGA为控制核心的图像存储电子学系统。设计对NAND Flash同时使用并行处理和4级流水技术,满足了相机图像高数据率存储要求。为了保证图像存储系统的可靠性,针对NAND Flash存在坏块的问题,对文件存储系统进行存储区划分并建立了坏块替换机制;同时,为了避免Nand Flash原始误码率和空间单粒子辐射效应的影响,提出了12×4 bit Hamming校验策略,并将校验码分割与图像数据进行存储;试验结果表明,设计的图像存储电子学系统,单通道最高实时图像存储数据率达到1 276 Mbps,实现了图像数据的可靠存储,可对12×4 bit单元的图像数据实现1 bit纠错,满足载荷任务的研制需求。To solve the problem of low bandwidth between Mars and Earth and the high-output image data rate of the high-resolution camera of Tianwen-1,an electronic image-storage system was designed by using a NAND Flash as a storage medium and a FPGA as a control core. The NAND Flash was designed to use parallel processing and 4-level pipelining technology to meet the requirements of high data rate storage of camera images. To ensure the reliability of the image storage system,the storage system area was divided and a bad block replacement mechanism was established. Moreover,to avoid the influence of the original bit error rate and the single event radiation effect of space,a 12×4 bit Hamming verification was proposed. The experimental results showed that the designed electronic image-storage system could achieve the highest real-time image storage data rate of 1 276 Mbps on each single channel,reliable storage of image data,and 1 bit error correction for a 12×4 bit unit of image data,meeting the requirements of the space mission.

关 键 词:高分相机 高速存储 NAND Flash 流水线 Hamming校验 

分 类 号:V476.4[航空宇航科学与技术—飞行器设计] V445.8

 

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