高速高可靠小型数字视频存储系统的设计与实现
发布时间：2019-03-31 18:28
【摘要】：在武器试验中，光电测量设备不仅要获得目标的外弹道轨迹、飞行轨迹等测试参数，同时还要获得目标的高精度飞行姿态参数、光学特性参数以及其它的常规测量参数。这些参数的取得依赖于所选择的大面阵、高帧频相机从不同角度获取目标的高速成像信息以及设备跟踪的测量信息，这对高速图像数据和同步测量信息的实时记录提出了更高的要求，为此研究性能可靠、体积小、容量大，面向高速数据的存储系统成为靶场测量急需解决的问题，本文主要研究对象为面向大型光电经纬仪的存储系统，同样适用于航测图像、气象雷达、遥感、爆炸实验、流体实验、碰撞检测的存储应用中。 本文主要针对高速数据和低速存储设备矛盾、图像和异源信息同帧控制、嵌入式Linux操作系统移植、系统小型化、图像数据的编码纠错，存储介质的损耗均衡等问题进行研究，实现了系统高速数据的高可靠存储和设备的小型化。 本文采用DM8168和FPGA相结合的嵌入式系统硬件平台直接存储方案，避免了非实时操作系统与计算机结构的瓶颈限制，仅由两个芯片完成了数据流的纠错编码、采集、存储和网络传输控制，减少芯片级联，降低硬件平均故障率，实现了系统的小型化。采用异源信息与图像数据同帧追加策略，保证了追加异源信息与图像数据的严格同帧存储。 结合图像的二维特点，本文设计了含有追加信息的实时图像二维RS编码纠错算法，在两个维度上进行RS编码纠错，该算法提高了纠正数据突发错误和随机错误的能力。同时还提出了采集容错和图像二维特性容错方法，保证了存储不丢帧，不误帧，实现了数据纠错、帧纠错和行纠错，提高了数据存储的可靠性。 本文对嵌入式Linux系统进行移植，增加必要驱动，裁剪掉系统无关模块，保证了系统的稳定运行管理，系统对固态硬盘采用基于地址顺序写入的均衡管理，顺次遍历固态硬盘所有的映射地址写入图像数据，延长了固态硬盘的使用寿命；对机械磁盘提出了采用直接控制物理地址的循道存储的方案，减少寻道时间，提高存储速度。 以DM8168为核心的嵌入式系统，进行任务管理时，突破了硬盘文件系统的限制，将硬盘文件分配表等参数信息独立记录在存储介质外部FRAM中，该设计减少了Linux内核对硬盘文件系统的操作开销，一方面便于机械磁盘数据恢复，另一方面解决了固态硬盘文件表需要损耗均衡的问题，提高系统可靠性。 本文研究的存储系统单元可实时稳定存储400MBps相机数据输入，大大提高了存储效率，，实现了设备的小型化设计，分块二维RS编码纠错的应用使编码纠错能力提高1.97倍，误比特率为1.01E-11，嵌入式存储系统实现了任务管理、数据远程网络下载和系统的在线维护，根据工程实际应用需要，采用针对高帧频相机的数据源流分配技术，对存储系统单元并行级联后，可以满足多领域的存储应用需要。
[Abstract]:In the weapon test, the photoelectric measuring equipment should not only obtain the testing parameters of the target's outer trajectory and flight trajectory, but also obtain the high-precision flight attitude parameters, optical characteristic parameters and other conventional measurement parameters of the target. The acquisition of these parameters depends on the large array selected, the high-speed imaging information of the target from different angles obtained by the high-frame-rate camera, and the measurement information tracked by the device. This puts forward higher requirements for real-time recording of high-speed image data and synchronous measurement information. Therefore, the research on high-speed data-oriented storage system with reliable performance, small size and large capacity has become an urgent problem to be solved in shooting range measurement. The main research object of this paper is the storage system for large-scale photoelectric theodolite, which is also suitable for the storage applications of aerial image, meteorological radar, remote sensing, explosion experiment, fluid experiment and collision detection. This paper mainly focuses on the contradictions between high-speed data and low-speed storage devices, image and heterogeneous information in the same frame control, embedded Linux operating system transplantation, system miniaturization, image data coding and error correction, loss equalization of storage media, and so on. The high reliability storage of high speed data and miniaturization of equipment are realized. In this paper, the direct storage scheme of embedded system hardware platform combined with DM8168 and FPGA is adopted to avoid the bottleneck limitation of non-real-time operating system and computer structure, and only two chips are used to complete the error-correcting coding and collecting of data stream. Storage and network transmission control can reduce chip concatenation, reduce the average failure rate of hardware, and realize the miniaturization of the system. The strategy of adding different source information and image data in the same frame is adopted to ensure the strict same frame storage of the additional source information and image data. Combined with the two-dimensional characteristics of the image, this paper designs a two-dimensional RS coding error correction algorithm for real-time images with additional information, and carries out RS coding error correction on two dimensions. The algorithm improves the ability of correcting data burst errors and random errors. At the same time, the methods of collecting fault tolerance and image two-dimensional characteristic fault tolerance are also proposed, which ensure that the storage can not lose frame and frame, realize data error correction, frame error correction and row error correction, and improve the reliability of data storage. In this paper, the embedded Linux system is transplanted, the necessary driver is added, and the system independent module is cut out, which ensures the stable operation and management of the system. The system adopts the balanced management based on address sequence writing to the solid state hard disk. After traversing all the mapping addresses of the solid state disk, the image data is written, which prolongs the service life of the solid state hard drive. This paper presents a scheme to control the physical address of the mechanical disk, which can reduce the searching time and improve the storage speed. In the embedded system with DM8168 as the core, the task management breaks through the limitation of the hard disk file system, and the parameter information, such as the hard disk file allocation table, is recorded independently in the external FRAM of the storage medium. The design reduces the operating overhead of the Linux kernel to the hard disk file system, on the one hand, it is convenient to recover the mechanical disk data, on the other hand, it solves the problem that the file table of the solid state disk needs to be balanced and improves the reliability of the system. The storage system unit studied in this paper can store the data input of 400MBps camera in real time and stably, which greatly improves the storage efficiency and realizes the miniaturization design of the equipment. The application of block two-dimensional RS coding and error correction improves the coding and error correction capability by 1.97 times. The bit error rate is 1.01Ex11. The embedded storage system realizes task management, data remote network download and on-line maintenance of the system. According to the requirements of engineering application, the data source and stream allocation technology for high frame-frequency camera is adopted. After parallel concatenation of storage system cells, it can meet the needs of multi-domain storage applications.
【学位授予单位】：中国科学院研究生院（长春光学精密机械与物理研究所）
【学位级别】：博士
【学位授予年份】：2012
【分类号】：TP333;TP391.41
本文编号：2451168
[Abstract]:In the weapon test, the photoelectric measuring equipment should not only obtain the testing parameters of the target's outer trajectory and flight trajectory, but also obtain the high-precision flight attitude parameters, optical characteristic parameters and other conventional measurement parameters of the target. The acquisition of these parameters depends on the large array selected, the high-speed imaging information of the target from different angles obtained by the high-frame-rate camera, and the measurement information tracked by the device. This puts forward higher requirements for real-time recording of high-speed image data and synchronous measurement information. Therefore, the research on high-speed data-oriented storage system with reliable performance, small size and large capacity has become an urgent problem to be solved in shooting range measurement. The main research object of this paper is the storage system for large-scale photoelectric theodolite, which is also suitable for the storage applications of aerial image, meteorological radar, remote sensing, explosion experiment, fluid experiment and collision detection. This paper mainly focuses on the contradictions between high-speed data and low-speed storage devices, image and heterogeneous information in the same frame control, embedded Linux operating system transplantation, system miniaturization, image data coding and error correction, loss equalization of storage media, and so on. The high reliability storage of high speed data and miniaturization of equipment are realized. In this paper, the direct storage scheme of embedded system hardware platform combined with DM8168 and FPGA is adopted to avoid the bottleneck limitation of non-real-time operating system and computer structure, and only two chips are used to complete the error-correcting coding and collecting of data stream. Storage and network transmission control can reduce chip concatenation, reduce the average failure rate of hardware, and realize the miniaturization of the system. The strategy of adding different source information and image data in the same frame is adopted to ensure the strict same frame storage of the additional source information and image data. Combined with the two-dimensional characteristics of the image, this paper designs a two-dimensional RS coding error correction algorithm for real-time images with additional information, and carries out RS coding error correction on two dimensions. The algorithm improves the ability of correcting data burst errors and random errors. At the same time, the methods of collecting fault tolerance and image two-dimensional characteristic fault tolerance are also proposed, which ensure that the storage can not lose frame and frame, realize data error correction, frame error correction and row error correction, and improve the reliability of data storage. In this paper, the embedded Linux system is transplanted, the necessary driver is added, and the system independent module is cut out, which ensures the stable operation and management of the system. The system adopts the balanced management based on address sequence writing to the solid state hard disk. After traversing all the mapping addresses of the solid state disk, the image data is written, which prolongs the service life of the solid state hard drive. This paper presents a scheme to control the physical address of the mechanical disk, which can reduce the searching time and improve the storage speed. In the embedded system with DM8168 as the core, the task management breaks through the limitation of the hard disk file system, and the parameter information, such as the hard disk file allocation table, is recorded independently in the external FRAM of the storage medium. The design reduces the operating overhead of the Linux kernel to the hard disk file system, on the one hand, it is convenient to recover the mechanical disk data, on the other hand, it solves the problem that the file table of the solid state disk needs to be balanced and improves the reliability of the system. The storage system unit studied in this paper can store the data input of 400MBps camera in real time and stably, which greatly improves the storage efficiency and realizes the miniaturization design of the equipment. The application of block two-dimensional RS coding and error correction improves the coding and error correction capability by 1.97 times. The bit error rate is 1.01Ex11. The embedded storage system realizes task management, data remote network download and on-line maintenance of the system. According to the requirements of engineering application, the data source and stream allocation technology for high frame-frequency camera is adopted. After parallel concatenation of storage system cells, it can meet the needs of multi-domain storage applications.
【学位授予单位】：中国科学院研究生院（长春光学精密机械与物理研究所）
【学位级别】：博士
【学位授予年份】：2012
【分类号】：TP333;TP391.41
【引证文献】
相关期刊论文 前1条
1 李乐乐;肖园;汤轲;;基于MSP430的简易阻抗测量仪设计[J];科技视界;2013年02期
本文编号：2451168
本文链接：https://www.wllwen.com/kejilunwen/jisuanjikexuelunwen/2451168.html
