It is introduced how to produce a mis project , and specially described in detail the method and technology of improving safety and efficiency about those giant database which maybe processes a mass of data , and the difficult points involved to this large - scale system is also solved 摘要介绍“校园一卡通”项目中考勤及门禁管理系统的设计与实现，给出了该系统的架构和设计过程，对大型数据库软件处理海量数据的方式进行分析，深入研究了提高其安全性和效率的方法和技巧，并对这样一种大型系统所涉及的难点给予了解决。
On one hand , this task made use of vc6 . 0 to deal with the gray image which was collected by daheng video _ pci _ xr card on the windows operation platform through the way of interface ; on the other hand , it made some researches and the realization of technique on the meeting joint of the function in matlab engine and the disposal system of digit image . as a result , it can successfully transfer the image of matlab to handle the function in v . c6 . 0 and make a comparison on time and effect with the result made in v . c6 . 0 本课题一方面在windows操作系统平台上，通过人机界面的方式利用vc6 . 0对大恒video _ pci _ xr卡采集后的灰度图像进行软件处理，另一方面对matlab引擎库函数和数字图像处理系统的接口进行了研究和技术实现，从而在vc6 . 0环境中成功调用matlab的图像处理函数，在时间和效果两方面和vc6 . 0的处理结果进行了比较。
This paper gives a time - synchronization technique bases on gps time service signal which is used in broad band seismic recorder 。 by world coordination time offered by gps - - utc ( usno ) , adjust local clock base on gps signal , gain high nicety clock signal , clock precision reachs 10 - 6 。 this clock is the time source of broad band seismic recorder , bring the whole seismic recorder works in same time base . 1pps time base with high stability can be used as in - phase , spring , time and start - stop of every collection mode , while the scale under second make a precise time mark to receive data of broad band seismic recorder 针对接收机中gps信号的噪声进行kalman滤波软件处理, kalman滤波可以对gps信号与本地晶振时钟的时差数据在大噪声中进行平滑,在较短时间内估计出高精度的时差数据。系统消除了gps秒脉冲信号的ms级随机误差,把晶振秒脉冲的长期稳定度锁定到gps信号的稳定度上;在gps信号失效时给出了可行措施,能够保证在任何情况下产生一个稳定、高精度秒脉冲信号,误差在1 s内。
Traditional entity reverse technology is adopted to acquire point cloud information of product through many kinds of measurements , the point cloud information are processed with software , and it could be reversed to obtain shape , dimensions , precision of the product , but the precondition is that it must have entity reversed 传统的实物反求技术通过各种测量手段，获取产品的点云信息，经软件处理后反求出产品的结构形状、尺寸参数，但其前提条件是必须具有产品实物。
A universal and extendable hardware platform with the model of a / d - ddc - dsp was constructed , then dsp algorithms in software processing part are studied , of which the methods of window design of fir filter and a new fsk demodulation algorithm are discussed as an emphasis and their realizations on dsp chip are also provided in this paper 首先构造了一个只有“ a d ? ddc ? dsp ”模型的通用的、可扩展的硬件平台，然后对软件处理部分的dsp算法进行了研究，其中，重点探讨了fir数字滤波器的窗口设计法和一种新的fsk解凋算法，并给出了这两个算法在dsp芯片上的具体实现。
And especially introduces the theory and realization of a measurement system which uses the method of spectral estimation . much effort was devoted in the tow rubs of the realization of the measurement system in this way : the realization of high - speed signal collection system and high - distinguishability data signal procession with software 在本测试系统的实现中，高速、高精度的数据采集技术和对采集到的大容量数据进行高效率、高分辨率的软件处理，是系统实现的难点，本文主要对这两个问题进行探讨。
In the analog intermediate frequency project , the signal to be measured is converted to be a fixed intermediate frequency signal , which then is demodulated , logarithm amplified and detected to be a dc signal that can reflect the original signal strength . after passing the a / d converter , it will be processed by microcontroller in software 模拟中频方案将待测信号变频到固定中频上，对信号进行解调、对数放大、检波后，输出反映待测信号强度的直流信号，通过a / d转换送入单片机进行软件处理。
