Based on GPRS technology urban network monitoring system (1)

Abstract: the present municipal network control system equipment behind, features a single, perfect for monitoring method does not, according to the distribution network system features and functions, based on GPRS city network monitoring and management system of design concepts, the establishment of an approach based on GPRS technology monitoring system, introduced the GPRS technology in pipeline development and application.

Through GPRS module, will monitor the data sent to a monitoring center in real time, enabling field instrument data, and data center system for real-time on-line connection to achieve the objective of an effective monitoring.

0 introduction

Municipal pipe network system with water, electricity, gas supply, heating, drainage and other tasks, maintain and protect the production and the life of the city.

However, many municipal pipelines with pipeline does not fit, not normative, operational reliability, and security differences, many problems running costs higher, city network monitoring and maintenance work is also in regular or fixed-point manual inspections and field inspection stage, the lack of effective monitoring, early warning and the science of monitoring and maintenance.

Therefore, development for municipal network monitoring system on the network running, real-time monitoring, on the basis of monitoring of the implementation of dynamic, to supply emergency treatment, comprehensive defense, disaster early warning information analysis, network planning and design provides the basis for reasonable; at the same time on the network of the picture information and other information for scientific and effective management, for an accurate judgment network in disaster and damage to provide accurate information and decision support to solve China's long-run municipal pipe network system security guarantee rate and a low level of information management, and other problems.

Based on the GPRS municipal network monitoring system has changed the outdated equipment, features a single, perfect for monitoring method is not present, the monitoring system and early-warning system linkage, improving system security, strengthen the system of information management, and disaster prevention.

1 GPRS technology

GPRS is a GPRS (general packet radio service) is the short name, in the original way based on circuit-switched GSM network increases the SGSN and GGSN and other functional entity, for GSM users with packet-switched data service.

GPRS makes full use of the existing GSM network resources, allows the user to end-to-end packet transfer mode to send and receive data, and provides an efficient, low-cost wireless packet data service.

1.1 GPRS technology features

1) GPRS uses packet switching technology, efficient transfer of data and high speed or low speed signaling, optimize network resources and wireless resources.

2) support, high speed data transmission, can provide 9.05 ~ 17l.2kbit/s data transfer rate. 3) GPRS network access speed, with existing data networks for seamless connection and always online, the user is always in line or online. 4) GPRS support TCP, UDP, and other communication protocols, and IP networks, X.25 network interconnection. 5) GPRS design makes it not only supports intermittent burst data transfers, but also support occasional large amounts of data transfers. 6) GPRS can realize real-time transmission of data, the data flow of an effective acquisition and realization based on data and information on network monitoring.

Network Terminal need to field data for real-time acquisition and to quickly and efficiently transmitted to the control center, if transmission latency monitoring centre will not be able to efficiently use collected data to monitor heat exchange station, so called transmission network must be fast.

GPRS technology is just right for this kind of transfer requirements for network monitoring and data acquisition system provides a cost-effective means of communication.

1.2 GPRS wireless data transfer system components

GPRS wireless data transmission system is divided into three parts: monitoring terminal equipment, GPRS data transmission terminals, monitoring Center main station.

1) terminal equipment.

Main complete digital and analog acquisition. Monitoring points DTU fixed IP address for a SIM card. GPRS data transfer Terminal power, it is pre-set in the internal IP address active GPRS DTU Server Access Center, and the monitoring center to establish TCP/IP link. The monitoring Center Server PPP (Point to Point Protocol) dial-up, enter the GPRS APN intranet that gets a fixed IP address. When the main station you want to make a terminal data request, based on the IP address and ID number to find the corresponding terminal, the command issued to this Terminal, the Terminal response after data transmission via GRPS data terminal to the network proxy server port, by port mapping is forwarded to the monitoring Center main station, that is, complete a response type of communication processes.

2) GPRS data transmission terminals.

GPRS data transmission terminals implementation monitoring Center main station and terminal communication. Onsite data through data acquisition modules to RS232 interface output, direct and DTU RS232 interface link for data transmission, complete the information upload and issued.

3) Monitoring Center main station.

Mainly through human interaction. The central server is mainly responsible for network data link establishment and the transparent transfer of data to send and receive, the system the innermost layer of the operating system and system software; second-tier layer for system support software, mainly for data acquisition and transmission, that is, a variety of data from different terminal acquisition based on various communication protocols, and then through the network distribution to require these data systems; the third tier is based on the application tier, the acquisition of data through a variety of processing, through the GUI (Graphieal User Interface) interface is displayed to the monitoring personnel; the fourth layer is a senior application tier, the data for the pipeline scheduling system further management and decision making.

2 system hardware structure

Based on the GPRS network data monitoring system

Main monitor hosts, GSM/GPRS network and GPRS data transfer unit (GPRS DTU). Macro-economic point of view, the system consists of hardware platforms and software platform.

2.1 hardware platform structure

Hardware platform into monitoring and detection Terminal two parts.

Test Terminal acquisition sensor data, and then call the data into IP packets via GPRS module SM card access GPRS network, is sent to the external Internet network, and then through GPRS server, sends the data to the monitoring centre, the Monitoring Centre's PC to receive and process data. Network hardware data measurement and control system hardware diagram shown in Figure 1:

Monitoring terminal equipment based on microprocessor data acquisition system, sensor acquisition data after it is processed through the RS232 access GPRS communication module for the GPRS network communication.

Data terminal data through the UDP/IP, PPP protocol package is sent to the GPRS network, through GPRS data network to transfer data to the monitoring center.

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