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  • This model simulates a CDMA2000 1xRTT Forward link (between Base station and Mobile station)

    This model simulates a CDMA2000 1xRTT Forward link (between Base station and Mobile station)

    标签: station simulates Forward between

    上传时间: 2013-12-14

    上传用户:13188549192

  • relay station 在中繼網路上的研究以及相關模擬辦法

    relay station 在中繼網路上的研究以及相關模擬辦法,演算法呈現

    标签: station relay

    上传时间: 2017-06-10

    上传用户:jcljkh

  • station pcstation pcstation pcstation pcstation pcstation pc

    station pcstation pcstation pcstation pcstation pcstation pc

    标签: pcstation station pc

    上传时间: 2017-07-22

    上传用户:邶刖

  • mobile station training material

    mobile station training material

    标签: material training station mobile

    上传时间: 2017-09-09

    上传用户:gououo

  • calculate power received of station in wireless network

    calculate power received of station in wireless network

    标签: calculate received wireless network

    上传时间: 2014-01-04

    上传用户:kjl

  • transmission delay between two station in wireless network

    transmission delay between two station in wireless network

    标签: transmission wireless between station

    上传时间: 2017-09-13

    上传用户:CHINA526

  • C51读取GPS并电台通讯的源代码

    ·详细说明:c51读取gps并电台通讯的源代码-c51 reads takes gps and the broadcasting station communication source code

    标签: C51 GPS 读取 电台

    上传时间: 2013-05-31

    上传用户:徐孺

  • 利用高压看门狗定时器加强汽车安全系统

      Abstract: As electronic systems take over many of the mechanical functions in a car—ranging from engine timing to steering andbraking—there is a growing concern about fault tolerance. There should not be a single point of failure that would prevent a car fromat least "limping" off the road or making it to the nearest service station. Redundant systems, watchdog timers, and other controlcircuits are used to reroute signals and perform other functions that ensure that a vehicle can safely make it off the road when afailure occurs.

    标签: 看门狗定时器 汽车安全系统

    上传时间: 2013-11-10

    上传用户:diets

  • 基于CC1110单片机公交报站系统的设计

    基于CC1110单片机公交报站系统主要由CC1110单片机最小系统和WT588D语音模块组成,提出了如何实现语音报站,通过无线通信SimpliciTI网络协议实现公交站台的自动播报和OLCD液晶显示公交运行的各类信息。结果表明,该公交报站系统报站准确率99%,价格比同类产品下降了300%以上,系统组成结构简单,提高了系统的抗干扰性和稳定性,也便于携带。 Abstract:  The bus stop announcement system based on CC1110 MCU is composed of CC1110 MCU minimum system and WT588D voice module. How to achieve the voice announcing is put forward.The bus-stop will announce automatically and display on the OLCD by means of wireless communication SimpliciTI network protocol. As a result, the bus station stop announcement systems reported 99% accuracy rate, price of similar products declined by 300% or more, system of simple structure, improve the anti-jamming and stability of the power system, it is also portable.

    标签: 1110 CC 单片机 公交报站

    上传时间: 2013-10-20

    上传用户:baby25825

  • 基于多点网络的水厂自动监控系统设计

    基于多点网络的水厂自动监控系统设计Design of MPI Based Automatic Monitoring and Control System in Water Works刘 美 俊(湖南工程学院,湘潭411101)摘要针对水厂工作水泵多、现场离控制站距离远的特点,提出了一种基于MPI多点网络的自动监控系统的设计方法,分析了系统的工作原理,介绍了系统中数据的采集与处理、主站与从站的通信原理以及系统软件的设计。由于这种系统的主、从站PLC之间采用MPI网络通信,具有运行可靠、性能价格比高的特点,所以适用于中小规模水厂的分布式监控场合。关键词多点网络主站从站监控系统Abstract Ina ccordancew ithth efe atuersof w aterw orks,i. e. ,manyp umpsin o perationa ndth ep umps, farfor mt hec ontrolst ation,th em ethodo fdesigninga na utomati(〕monitoringa ndc ontorlsy stemb asedo nM PIis p resented.Th eo perationalpr incipleo fth esy stemi san alyzed,th ed atac olection,data processing; communication between master station and slave station as wel as design and system software are discussed. Because MPI network communicationis used among master station, slave stations and PLC, the system is reliable and high cost-efective. It is, suitable for smal and mediumsized water works for distrbuted monitoring and control.Keywords MPI Masterst ation Slaves tation Monitoringa ndc ontorlsy stem 自来 水 厂 的自动控制系统一般分为两大部分,一对组态硬件要求较高,投资较大。相对而言,MPI网是水源地深水泵的工作控制,一是水厂区变频恒压供络速度可达187.5 M bps,通过一级中继器传输距离可水控制,两部分的实际距离通常都比较远。某厂水源达Ikm 。根据水厂的具体情况,确定以MPI方式组地有3台深井泵给水厂区的蓄水池供水。水厂区的成网络,主站PLC为S7-300系列的CPU3121FM,从任务是对水池的水进行消毒处理后,通过加压泵向管站为S7-200系列的CPU222。这样既满足了系统要路恒压供水。选用Siemens公司的S7系列可编程控求,又相对于Profibus网络节省了三分之一的成本,制器(PLC)和上位机组成实时数据采集和监控系统, 这种分布式监控系统具有较高的性能价格比。系统对深水泵进行远程控制,对供水泵采用变频器进行恒中PLC的物理层采用RS - 485接口,网络延伸选用压控制以保证整个水厂的电机设备安全、可靠地运带防雷保护的中继器,使系统的安全运行得到了保行。证。MPI网络的拓扑结构如图1所示。1 多点网络(NWI)监控系统的组成Sie me ns 公司S7系列PLC通常有MP」多点网络与Profibus现场总线网络两种组网方式。Profibus现场总线的应用目前较为普遍,通用性较好,它由Profibus一DP, Profibus一FMS, Profibus一PA组成。Profibus - DP型用于分散外设间的数据传输,传输速率为9.6kbps一12Mbps,主要用于现场控制器与分散1/0之间的通信,可满足交直流调速系统快速响应的时间要求,特别适合于加工自动化领域的应用;Profibus - FMS主要解决车间级通信问题,完成中等传输速度的循环或非循环数据交换任务,适用于纺织、楼宇自动化、可编程控制器、低压开关等;Profibus - PA型采用了OSI模型的物理层和数据链路层,适用于过程自动化的总线类型。

    标签: 多点 网络 系统设计 自动监控

    上传时间: 2013-10-08

    上传用户:fac1003