安全性低和较高的峰均功率比（ＰＡＰＲ）是正交频分复用无源光网络（ＯＦＤＭ－ＰＯＮ）系 统 所 面 临 的 主 要 挑 战，为此提出一种基于二维混沌加密的选择 性 映 射 （ＳＬＭ）方 案。该 方 案 利 用 二 维 Ｌｏｇｉｓｔｉｃ映 射 分 别 产 生 随 机 交 织 器和相位序列对 ＯＦＤＭ 信号进行加扰，达到系统加密的 同 时 降 低 ＰＡＰＲ 的 目 的。仿 真 结 果 显 示，与 传 统 ＳＬＭ 算 法和原始光 ＯＦＤＭ（Ｏ－ＯＦＤＭ）信号相比，所提出的方案可分别获得０．５ｄＢ和３．８ｄＢ的 ＰＡＰＲ 抑制增益。实验证明，７Ｇｂｉｔ／ｓ １６ＱＡＭ （Ｑｕａｄｒａｔｕｒｅ Ａｍｐｌｉｔｕｄｅ Ｍｏｄｕｌａｔｉｏｎ）Ｏ－ＯＦＤＭ 加 密 信 号 可 通 过 ２５ｋｍ 标 准 单 模 光 纤 在 强 度 调制／直接检测 ＯＦＤＭ－ＰＯＮ 系统中安全传输并且系统误码率性能得到改善。
Optical commnications; intensity modulation/direct detection; orthogonal frequncy divison mulitplexing passive optical network systems; selected maping; encryption; PAPR (2020-09-12, Others, 694KB, 下载2次)
CAN总线控制器设计，CAN 是Controller Area Network 的缩写（以下称为CAN），是ISO国际标准化的串行通信协议。在当前的汽车产业中，出于对安全性、舒适性、方便性、低公害、低成本的要求，各种各样的电子控制系统被开发了出来。由于这些系统之间通信所用的数据类型及对可靠性的要求不尽相同，由多条总线构成的情况很多，线束的数量也随之增加。为适应“减少线束的数量”、“通过多个LAN，进行大量数据的高速通信”的需要，1986 年德国电气商博世公司开发出面向汽车的CAN 通信协议。此后，CAN 通过ISO11898 及ISO11519 进行了标准化，现在在欧洲已是汽车网络的标准协议。
CAN bus controller design, CAN stands for Controller Area Network (hereinafter referred to as CAN) is a serial communication protocol of the ISO international standardization. The current auto industry, for safety, comfort, convenience, low pollution, low-cost requirements of a wide range of electronic control systems have been developed out. Different data types used for communication between the system and reliability requirements, multiple bus Harness the number increases. To adapt to " reduce the number of harnesses, a large number of high-speed data communication needs of the number of the LAN, in 1986 the German Electrical and Bosch developed the CAN communication protocol for automotive. Since then, CAN ISO11898 and ISO11519 standardization in the European automotive network standard protocols. (2012-08-15, PDF, 2259KB, 下载13次)
为了给变频调速系统提供必要的设计参数，依据空间电压矢量脉宽调制（SVPWM）基本原理，介绍了
异步电动机及 SVPWM 算法在 Matlab/Simulink 环境下的建模过程及基于矢量控制理论的变频调速系统动态
模型建立。详细地阐述了实现仿真的方法，并针对仿真中的关键问题及系统的仿真结果进行了分析。仿真结
果表明，采用该控制系统，电压及转矩波动小，转速响应迅速，系统的各项指标都满足电机实际运行特性要
求。其仿真算法对于实现数字化控制变频调速系统具有一定的价值。
To provide the necessary design parameters for the actual motor control system, the modeling course of
voltage space vector pulse wide modulation（SVPWM）agrithmetic and AC motor under Matlab/Simulink environment
are introduced. The dynamic model of variable frequency speed regulating system based on vector control is
discussed according to the principle of SVPWM. The new method of realizing simulation, key problems and
results of the simulation are analyzed in detail. The experimental simulation results show that this system has
smaller fluctuations of voltage and torque, quicker response speed, and all of the indicators accord with the
performance of the actual motor. The simulation agrithmetic have value to realize controlling motor with digital
signal processing.
(2011-12-04, matlab, 214KB, 下载109次)
给出一种基于LabVIEW及NIDAQmx的压延机在线测厚系统。该系统选用NI PCI-M6220数据采集卡,控制伺
服电机带动传感器在线测量产品厚度,并对厚度值及其位置坐标进行记录,另使用NI图形化编程软件进行测厚系统的控
制、采集数据的分析处理和用户界面的编写,构建PC机的LabVIEW测控平台。该系统数据采集频率高、系统配置灵活、
程序编制简单,从整体上降低研发成本和时间,适合于现场长期使用
Given based on LabVIEW and NIDAQmx the calendar online thickness measurement system. The system used NI PCI-M6220 data acquisition card to control the servo motor to drive the product-line measurement of the thickness of the sensor, and the thickness of the value and location coordinates recorded, and the other using the NI graphical programming software for thickness measurement system control, data collection analysis processing and user interface written in LabVIEW to build and control the PC platform. The high frequency data acquisition system, system configuration flexibility, simple programming, reduce overall development costs and time, suitable for on-site long-term use (2011-11-08, LabView, 523KB, 下载56次)
实现功能简介：
1）联动功能：
两部电梯之间相互联动，即同时按下任何一部电梯的外部向上或向下键之后，两部电梯同时接受此指令，然后由系统判断，与该请求所在楼层最近并且运行方向相同的电梯执行指令，另一部电梯不执行该指令。
2）手动开门功能：考虑到在实际生活中可能出现电梯上客时间不够的情况，在电梯内部设置了该功能，按下开门键，电梯延长开门时间。
3）报警功能：本例中为报警状态设置了单独的状态，意在考虑到现实生活中多种多样的报警原因，报警之后，门打开，处于等待修理的状态，在修理完毕之后，按下复位键使得电梯重新开始运行。
Function introduction:
1) linkage function:
Two elevators linkage between, that is, at the same time in an elevator any external up or down key later, two elevators and accept the instructions, then the system judgment, and the request in the floor and running the same direction recently the elevator the instruction execution, another lift not execute the instructions.
2) manual open the door function: to consider in the practical life may appear on the elevator of guest time enough, in the elevator set up inside the function, press the key to open the door, elevator extend time to open the door.
3) alarm function: in the case of the state for alarm set separate state to consider to real life DuoZhong variety of alarm reason, after the alarm, the door opened, in a waiting state of repair, in after the repair, press the reset button to make elevator start running. (2011-11-07, VHDL, 14KB, 下载9次)
利用MSPd30F149 单片机和AIM21电流环芯片，通过简单的压频转换(多谐振荡器)电路实现了基于电客式差压
传感器的智能差压变送器设计。该设计的特点是利用压频转换电路取代了A／D模块，以极低的产品价格达到了较高的
系统测量精度。采用软件与硬件相结合的信号处理技术，实现了基于HART协议现场总线技术的差压模拟量的测量，通
过进一步采用CPLD器件的量化延时测频技术，将可以达到比传统A／D器件更高的压力测量精度。智能差压变送器；HART协议现场总线；MSP430F149；AIM21
The use of MSPd30F149 chip microcontroller and AIM21 current loop, through a simple voltage to frequency converter (multi-harmonic oscillator) circuit based on power-off-type differential pressure sensor design of intelligent differential pressure transmitter. The design is characterized by the use of voltage to frequency converter circuit to replace the A/D module, a very low price to achieve a high system accuracy. Using a combination of software and hardware signal processing techniques to achieve an agreement based on the HART field bus technology differential analog measurements, using CPLD devices through further quantify the delay frequency measurement techniques, will be able to reach than the traditional A/D device is more high-pressure measurement accuracy. Smart differential pressure transmitter HART protocol field bus MSP430F149 AIM21 (2010-02-01, C/C++, 148KB, 下载123次)
提 出了一种 网络 化嵌 入 式 数 控 系统 ， 系统 采 用 A RM 4 - D S P结 构 ， 实现 了数 控 系统 的 小型 化 、 网络 化 、 智能化 和 集成 化 。详 细介 绍 了嵌入 式数 控 系统 内 CNC主控 单元 与 伺 服 驱动 及 I ／0逻辑 控 制 等各 单
元 间的通信 、 车 间级 工 业 以太 网络 的通信 和 i n t r a n e t ／ I n t e r n e t网络 通信 ， 并给 出 了关键 实现技 术。
A network of embedded numerical control system, system A RM 4- DSP structure and realize a small-scale numerical control system, network-based, intelligent and integrated. Details of embedded CNC system CNC control unit and servo drives and I/0 logic control unit and other communication, workshop-level industrial Ethernet communications and intranet/I nternet network communication, and gives a key technology. (2008-04-10, PDF, 247KB, 下载60次)
目前很多水电公司仍然采用人工催费的方法，费时费力，效率低。水电费语音自动查询催费系统正是为解决这一问题应运而生的。电话用户可随时随地拨打水电公司特服电话访问查询系统，查询水电费发生情况，了解用水电情况；对于逾期拖欠水电费的用户，系统自动拨打欠费电话，提醒用户及时交纳水电费。
many utilities companies still use manual methods of payment reminders, time-consuming, inefficient. Utilities voice automated inquiry urge system is to resolve this issue at the right moment. Phone users can call anywhere hydropower companies serving special telephone inquiry system for the occurrence of utilities to understand the situation with water and electricity; Utilities overdue arrears for the user, the system automatically dial telephone arrears to remind users of timely payment of utilities. (2005-09-05, WORD, 310KB, 下载385次)