The Automatic Mrter Reading System Based On The CDMA Direct Sequence Spread Spectrum

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.