Research Of Water Quality Monitoring System For Urban Rain Water And Sewage Pipe Network

Urban rainwater and sewage pipe network system is an important part of urban infrastructure, which is relationship to the city's survival and development. With the development of economic, the growth of population and the scale of the city, the aging of rainwater and sewage pipe network and the relative backwardness of monitoring become a serious problem. In order to meet the requirements of water resources development situation, obviously needing to establish a modern regulatory pipe network system in new period. But there are still some pressing problems. As technically speaking, which concentrated in the low automation, the timeliness of information processing and the needs of management can not meet. To solve these pressing problems, we combine special issues of major of the Ministry of Science, which means model issues of urban rainwater and sewage pipe network system with new technology of transformation, running and controlling, for designing water quality monitoring system of urban rainwater and sewage pipe.Through searching plenty of documents and analyzing the status of the overseas, to solve the pressing problem of model issues of urban rainwater and sewage pipe network system. Proposing the design of overall system hierarchy, the structure of the system is divided into three layers according to function. The bottom layer is monitoring terminal, the middle layer is regional monitoring, and the top layer is urban monitoring center. Each layer has its own specific features, and there is interaction between layers, which form an integrated system with water quality monitoring and water quality information management and network operation control. This dissertation pays an important attention to hardware and software design of the water quality monitoring system.In the analysis of the advantages of embedded technology and detailed understanding of the principles and characteristics of GPRS network, this dissertation presents the design of water quality monitoring terminal. ARM9 chips S3C2410 is adopted as the core of monitoring terminal in order to acquisition and processing field sensors' signal. GPRS network has many advantages in remote communication. GPRS is a mature network which has better real-time performance and less cost of construction. GPRS module MC55 connect with S3C2410 by serial interface. Sensor signals are processed by ARM9 processor S3C2410, and then encapsulated into TCP/IP data packs by GPRS module MC55. Through GPRS accessing the Internet, these data packs are transmitted to the monitoring center.The design of field water quality monitoring terminal mainly includes two parts: hardware design and software design. Hardware design is mainly about interface circuit of S3C2410 and MC55, such as power supply circuit, memory circuit, keyboard circuit, LCD circuit, serial port circuit, SIM card circuit and hardware function testing also. Software design include Linux system transplantation, drivers and applications design, AT commends for GPRS communication. Through using PC to simulate the monitoring center server, the monitoring terminal communicates with server successfully by socket.The design scheme of water quality monitoring system widely applied detection technology, computer network technology, communication technology and other comprehensive technology. This system is a real-time monitoring system which has high reliability. It can monitor field water quality data scientifically and accurately.