【作者】 刘冰；

【导师】 乔佩利；

【作者基本信息】 哈尔滨理工大学 ， 计算机应用技术， 2005， 硕士

【摘要】 随着电子、通讯、计算机技术的发展,实现各种用户仪表的自动抄录即将成为现实。通信方式的选择是自动抄表系统成败的关键。国内外科技人员已经尝试把多种通信技术应用于自动抄表系统,并取得巨大的成功。本文通过对当前国内外常用通讯方法实现原理进行介绍和比较,结合我国国情提出了一种新的通信方案——基于CDMA 扩频的电力载波通信。本文将首先提出一种抄表系统的总体结构和各部分的工作原理,详细论述扩频通信技术的理论基础及实现原理,分析了直接序列扩频通信方式中PN 码的性质、原理、m 序列的原理、产生以及对直扩系统中的核心部分——同步阶段(捕获同步、跟踪同步)进行设计。最后给出系统主站软件的设计。通过对同步过程的两个阶段——搜捕阶段和跟踪阶段的分析,证明了本系统所采用通信方法具有很多的优点。本文还详细给出了基于CDMA 扩频电力载波通信的自动抄表系统主站管理软件的设计思想以及实现方法。本软件系统应用串口通信、SQL Server 数据库中存储过程、触发器等技术给出了自动抄表系统主站管理软件的设计与实现。本软件的设计根据软件工程的设计思想实现了低耦合,高内聚的模块结构并兼顾了安全性、可靠性、可维护性、可移植性。更多还原

【Abstract】 With the development of electron, communication and computer technology, the automatic meter reading (AMR) system will be realized. To choose the methods of communication is the key of AMR system. The engineers all over the world have been trying to apply many kinds of communication methods to AMR and their efforts have met with great success. The paper compares and analyses these communication methods. According to our national condition, the author proposes an approach to design a kind of AMR system based on the CDMA direct sequence spread spectrum. Firstly, the paper introduces the structure of AMR system, work principle of every part and theorem of spread spectrum. Secondly, the author analyses the character and principle of PN code and m sequence, and designs the key part of direct sequence spread spectrum system ——synchronic stage. Finally, the paper outlines the design of management software in detail. The paper demonstrates that this method has many merits by analyzing the searching and catching stage and the tracking stage. The author applies COM communication, storage process and trigger of SQL Server data base to the management software. The design of this management software based on software project realizes many advantages such as high coupling, low cohesion and considers safety, reliability, transplantation.更多还原