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高速图像数据实时存储系统设计
中文摘要

随着技术的不断进步,现代武器的飞行速度越来越快,机动性越来越好。为获取精确的目标运动的特性和准确判断目标的位置,得到更高精度的弹道测量数据,在现代光电经纬仪中已普遍采用大面阵、高帧频的CCD相机,这样不可避免地产生了大量的高速传输的图像数据。由于实时输出脱靶量的精度较低,为了获得更高精度的测量数据,一般把图像数据和编码器数据实时记录下来,采用事后判读方式,得到图像中目标的脱靶量,再合成脱靶量值和编码器值,最终得到目标的真实方位角和高低角。随着相机输出数据量的不断增加,图像数据实时存储对于速度和容量提出更高的要求。开发高速海量存储系统成为本课题的研究核心。论文以“高速CCD相机取代摄影机项目”为课题背景,深入的研究了高速图像传输接口、SCSI总线接口、PCI-X总线接口、硬盘绝对扇区数据写入的实时无压缩存储的问题。 在比较各种图像数据传输方案的基础上,本文采用基本的CameraLink配置实现了100MB/S数据传输。采用PCI-X高速总线完成图像的实时传输, ULTRA320高速SCSI总线传输数据到硬盘阵列,采用由4块SCSI硬盘组成的RAID0级存储阵列。由此保证了整个传输记录系统的高带宽。实验结果证明,采用4块SCSI硬盘组成的磁盘阵列持续存储速度超过100MB/S。 在工作中,为了更加充分的利用高速图像采集卡的性能,在Win2000操作系统下重新改进了采集卡的驱动程序,增强了对图像采集过程中时序的检测,提高了系统对外部事件响应的实时性。考虑到系统同时采集测量数据和图像信息,在应用程序的开发中采用了多线程技术,在线程中对外设进行操作,为了防止线程阻塞,对外设的操作均采用异步方式,提高了CPU的资源利用率。采用了高速PCI-X总线,从而突破了以往存储方案中的PCI总线速度的瓶颈。为了降低操作系统的文件管理对写入速度的影响,在应用软件中采用了异步绝对扇区写入的方式,突破了操作系统和复杂的文件系统对写入速度的限制。RAID0技术的引入又大大提高了系统的存储速度,使系统资源得到充分利用。由此大幅提高了系统的存储速度,达到了稳定存储速度100MB/S以上。 由此可见,采用Camera Link传输技术可以实现100MB/S测量图像数据传输,采用PC平台,采集卡、存储卡加磁盘阵列结构完全能够做到100MB/S存储速度。本系统具有性价比高、开发时间短、结构简单、图形化界面、操作方便等特点。 关键词:CCD相机,PCI-X,SCSI,异步操作,RAID

英文摘要

Along with the technical unceasing progress, modern weapon's flying speed is getting quicker , the mobility is getting better and better. For the gaining precise target travel's characteristic and the accurate judgment goal's position, obtaining the high accuracy trajectory metrical data, the big area array, the high frame frequency CCD camera generally has used in the new generation electro-optic altazimuth. It has had the massive high speed transmission image data inevitably. Therefore, the image data real-time recording sets a higher request for the speed and the capacity. Developing the high speed mass store system becomes the research core of this topic. The paper takes "the high speed CCD camera substitution photo project" as the topic background, roundly researches high speed image transmission, image data real-time non-compression storing and encoder extra information storing question. In compares each kind of image data transmission plan, this article used the basic Camera Link method to realize the 100MBps data transmission. We use the PCI-X high speed bus to complete the image the living transmission, ULTRA320 the high speed SCSI bus transmission stored data, use RAID0 level SCSI array which is composed of the double hard disks. All these have guaranteed overall system's transmission band width. The experimental result indicated that using the double SCSI hard disks composition hard disk array store to realize has got surpassed 100MB/s the storing velocity. In the research work, for the fuller using high speed image gathering card's performance, we has compiled the driver of gathering card under the Win2000 OS, enhanced the system real-time response. Considering the system simultaneously gathers the metrical data and the video information, we have used the multi-thread technology in the application procedure's development, carried on the operation to the peripheral device in the thread. In order to prevent thread blocking, the asynchronous system call on the peripheral device operation is used. It raised the efficiency of CPU resources. With the high speed PCI-X bus, the system broke through in the older storage scheme PCI bus speed bottleneck. In order to reduce influence of operating system's file management to speed of the writing operation, we has selected the method of the asynchronous absolute sector writing, broke through the limit of the operating system and file system. The RAID0 technology's introduction greatly raised system's storage efficiency, enables the system resources to obtain the full use. So this raised system's storing velocity to achieve enormously recording above stably 100MBps. Thus it can be seen, using the Camera Link technology to be possible to realize the 100MBps survey image data transmission, using the PC platform, the gathering card, the hard disk array architecture we can achieve 100MBps the storing velocity. The short development time, the simple structure, graphical interface, ease of operation are the system's characteristic. Key words: CCD camera, PCI-X, SCSI, Asynchronous operation, RAID

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