基于ARM和线阵CCD的高–高速数据采集系统毕业论文外文翻译

1、highspeed data acquisition system based on arm linear-ccdabstract : this paper presents a high speed acquisition system of linear-ccd based on arm, high-speed linear-ccd and high-speed adc are selected. as the sampling speed of a/d is slower than the working clock frequency of arm, cpld and fifo are

2、 used as i/o between a/d and arm. it makes the circuit works harmonious, simple and easy controlling, and also increases the efficiency of arm. in order to increase the communication speed, the universal serial bus (usb) technology is adopted to communicate with the pc. arm is the key processor util

3、ized to control the data sampling, data compute and data transfer. as a result, the whole system works effective. the system can be applied to the high speed data acquisition and operation situations from multi-channel analog signals. key words : arm; linear ccd; contact-line; pantograph; stagger va

4、lue i. introduction in electrification railways, in order to extend the life of the pantograph on electric locomotives, so that the slider of pantograph wear evenly, the contact-line (electrified railway power feed line) in straight-line segments is arranged as zigzag route (curve section arranged i

5、n the form of polyline). the distance between the contact-line of positioning point and the pantograph centerline track is called out stagger-value, which is a key indicator of contact-line .stagger-value can not be ignored, the value too small will affect the slider of pantograph wear evenly and th

6、e purpose of extending using life; otherwise, in some cases (such as caught in a stiff winds), cause a large range of lateral movement of the roof (and the higher the speed, the greater pantograph swing around), some parts of contact-line will be in excess of the effective work length of pantograph,

7、 so that the stagger-value of contact-line beyond the standard range, leading to deterioration of the current collection, and even cause incorrect running of the pantograph accident. pantograph-catenary malfunction will result in interruption of train operation, which impact on rail transport seriou

8、sly. in order to avoid these phenomena, the stagger-value and its changes should be tested regularly.therefore, a locomotive contact-line monitoring system and its mating data acquisition system were developed, which calculate the instant stagger-value quickly.ii. system components system hardware c

9、omponents are shown in figure 1. the system consists of the following components: (1) using toshiba companys high-speed linear array ccd to achieve the digitization of contact-line images (ccd output the signal of corresponding time sequence of position); (2) using atmel companys at91rm9200 processo

10、r of arm9 series to realize digital signal acquisition and processing; (3) using pdiusbd12 usb interface device to complete the data communications between measurement system and the pc. due to the characteristics of its improved harvard structure, special instructions and quick to realize a variety

11、 of signal processing, arm processor is widely used in image processing, communications, radar, sonar, precision machinery fields, etc. arm processor is adopted for its arithmetic speed and bus width. as the real-time signal analysis and calculation require a high speed of computing, atmel companys

12、arm chipat91rm9200 is selected. the chip is arm920t based, high-performance, low power consumption 16/32-bit risc(reduced instruction set computer) microcontroller, which incorporates a rich set of application peripherals and provide a single-chip solution for industrial control applications that re

13、quire a wide range of peripherals at low power consumption and strictly stable working. iii. real-time processing and transmission of ccd digital image in order to achieve real-time digital image transmission, several major factors which affect real-time transmission should be necessary to solve: fi

14、rst, the speed of linear array ccd data acquisition; second, the transmission speed between linear array ccd and arm processor; the third is the data transmission speed between arm processor and computer. the following will be described in detail. linear array ccd acquisition speed acquisition speed

15、 is a critical performance indicator for image sensor, toshiba companys tcd1209d linear array ccd is used to meet the targets. its clock pulse frequency can operate as high as 20mhz, especially suitable for high-speed conditions of size measurement and dynamic analysis.linear array ccd tcd1209d and

16、its time sequence diagram are shown in figure 2. transmission speed between ccd and arm processor in order to improve the speed of ccd data acquisition and reduce conversion time, adopting high speed a/d converter can make it exchange data with arm processor at high-speed. adc08200, analog companys

17、nanosecond conversion device is adopted. its a single-channel, 8-bit a/d converter, which operates over a wide range of temperature, converts fast, operates at conversion rates up to 230 msps, thus achieving entire signal acquisition of linear array ccd. adc08200 is shown in figure 3.pc-side usb dev

18、ice driver is completed by windriver. data communication between pc and usb equipment mainly includes two aspects: first, read the sample data; second, send control commands to the acquisition system. 中文翻译：基于arm和线阵ccd的高高速数据采集系统摘要：本文提出了一种基于arm的线阵ccd高速数据采集系统，高速线阵ccd高速adc的选择。作为a/d采样速度比臂的工作时钟频率较慢，cpld和f

19、ifo作为i / o a/d与arm之间。它使电路工作在和谐，简单，易于控制，并且增加臂的效率。为了提高通信速度，通用串行总线（usb）技术是通过与pc机通信的关键是利用arm处理器控制数据采集，数据的计算和数据传输。作为一个结果，整个系统工作的有效性。该系统可应用于高速数据采集和多路模拟信号的工作环境下。关键词：臂；线阵ccd；接触线；受电弓；交错价值一、引言.在电气化铁路，为了扩大对电力机车受电弓的寿命，使受电弓滑块磨损均匀，接触线（电气化铁路供电线）在直线段设置为锯齿形路线（设置折线的形式的曲线段）。定位点和受电弓轨道中心线的接触线之间的距离称为拉出值，这是接触线的关键指标。参差不可忽视

20、的价值，值过小，会影响受电弓滑板磨损均匀，延长使用寿命的目的；否则，在某些情况下（如陷入激烈的风），使屋顶的横向移动幅度大（和更大的受电弓左右摆动的速度，更高的），接触线的部分将在受电弓的有效工作长度过剩，使接触线拉出值超出标准范围，导致当前集合的恶化，甚至造成受电弓的事故不正确运行。弓网故障会导致列车运行中断，严重影响铁路运输。为了避免这些现象，拉出值及其变化，应定期测试。因此，一个机车接触线监控系统及其配套的数据采集系统的开发，并计算瞬时拉出值迅速。系统组件该系统由以下几部分组成：（1）使用东芝公司的高速线阵ccd实现接触线图像的数字化（ccd输出的位置对应的时间序列的信号）；（2）采用atmel公司的at91rm9200 arm9芯片实现数字信号的采