Application of GPRS in environmental protection da

Application of GPRS in environmental protection data acquisition system

as the technical department of the national environmental protection system, the environmental monitoring department is an important basis for environmental management. With the enhancement of citizens' environmental awareness, more and more people begin to care about the quality of the environment, and require transparency in environmental protection; The superior competent departments also need information with large quantity, many kinds and fast update. All this puts forward a problem that should be paid attention to for the components printed by CRP USA, the environmental monitoring department, using SLS 3D printing technology and windform materials, which are tough, high strength and light weight: how to establish an environmental protection data acquisition system with strong practicality, wide coverage and good flexibility to meet the needs of all aspects of environmental monitoring information

in environmental protection systems, many pollution emission points often need to be monitored in real time, and most of the monitoring data need to be sent to the back-end server of the management center for processing in real time. Because the monitoring points are scattered and widely distributed, and most of them are set in areas with poor environment, it takes half the effort to transmit data to the past through the line. Data transmission through GPRS wireless network has become one of the communication means chosen by environmental protection departments. The pollution source monitoring equipment can timely send the collected pollution data and alarm information to the environmental protection monitoring department through GPRS network, so as to realize the timely management of pollutant discharge units or individuals, which can greatly improve the work efficiency of the environmental protection department

I. project requirements

environmental protection data acquisition system is a pollution source monitoring system composed of pollution source emission monitoring points and monitoring centers. The system can automatically sample the pollution sources and monitor the main pollution factors; Master the emission of urban pollution sources and the total emission of pollution sources, and automatically transmit the monitoring data to the environmental protection monitoring center; Data collection, sorting and comprehensive analysis are carried out by the computer of the monitoring center; The monitoring information is transmitted to the Environmental Protection Bureau, which will supervise and manage the pollution sources

at present, pollution source monitors are installed at each pollution source emission monitoring point to monitor the pollution source. The monitoring center receives the monitoring information transmitted by the monitoring points; It is also responsible for classification, screening and comprehensive analysis of monitoring information

as the decision-making center of the system, the Environmental Protection Bureau analyzes and investigates the monitoring information obtained from the monitoring center station, makes management decisions in time, and increases management efforts

at present, the data communication between the provincial environmental protection monitoring station and each collection point mainly adopts manual transcription or PSTN line transmission. When using the line to transmit data, because each dial needs to wait, the speed is slow and the cost is high. At the same time, due to the wide distribution range, large number and long distance of each monitoring point, and the remoteness of individual points, many lines need to be applied for, and some monitoring points are difficult to reach by wired lines

gprs has the characteristics of high speed and low cost, and its transmission speed can reach 171.2kb/s. Compared with wired communication, GPRS wireless communication is very flexible. It has the advantages of flexible group, easy expansion, low operation cost, simple maintenance and high cost performance. Therefore, GPRS wireless transmission can be used to solve the problem of real-time transmission of pollution source monitoring data

II. Advantages of the scheme

China mobile GPRS system can provide wide area wireless IP connection. Building an environmental protection information collection and transmission system on the GPRS service platform of mobile communication company to realize the wireless data transmission of environmental protection information collection points has the advantages of making full use of the existing network, shortening the construction cycle and reducing the construction cost, and the equipment is easy to install and maintain. After comparison and analysis, we choose the GPRS system of China Mobile as the data communication platform of environmental protection information, especially Wenzhou enterprise acquisition and transmission system

gprs wireless environmental pollution source monitoring system has the following characteristics:

1, strong real-time:

compared with short message service, GPRS has the ability to bridge the capacitor between the power supply and ground terminal of IC; When the transistor circuit is connected across the base input or collector output, the system can receive and process various data of multiple/all monitoring points synchronously without time delay and round robin. It can well meet the requirements of the system for real-time data acquisition and transmission

2. Remote control of instruments and equipment at each monitoring point:

reverse control of instruments and equipment can also be realized through GPRS two-way system, such as time correction, status report, switch and other control functions, and the system can be remotely upgraded with the stability of various experimental machine indicators of Jinan new era assay instrument Co., Ltd

3. Low construction cost:

due to the use of GPRS public platform, there is no need to build a network, just install the equipment, and the construction cost is low

4. Wide monitoring range:

the construction of environmental protection information collection and transmission system requires a wide range of data communication coverage, unlimited expansion and unlimited access location, which can meet the access needs of mountains, towns and cross regions. Due to the large number of environmental protection information collection points, which are distributed throughout the province, some environmental protection information collection points are located in remote areas, and the geographical location is scattered

5. It has good scalability. At present, the gsm/gprs network has covered most areas of the province, and there is basically no blind area, which can realize a wide range of monitoring and meet the requirements of the environmental protection information collection and transmission system for coverage

6. Large transmission capacity of the system:

the environmental protection center station should realize real-time connection with each environmental protection information collection point. Due to the large number of environmental protection information collection points, the system is required to meet the needs of sudden data transmission, and GPRS technology can well meet the needs of sudden data transmission

7. High data transmission rate:

each data transmission volume of each environmental protection information collection point is within 10kbps. The GPRS network transmission rate can theoretically reach 171.2kbit/s. At present, the actual GPRS data transmission rate is about 40kbps, which can fully meet the data transmission rate (≥ 10kbps) requirements of the system

8. Low communication cost:

the monthly billing method is adopted, and the operation cost is low

III. solution introduction

since GPRS communication is a data packet communication network based on IP address, the computer host of the monitoring center is configured with a fixed IP address, and each data collection point uses GPRS module to communicate with the host

(I) system composition

1. Environmental protection information collection point:

the on-site monitoring point automatically collects pollution source information through the data collection module, connects with the GPRS transparent data transmission terminal through the RS232 interface, and processes the data through the built-in embedded processor in the GPRS transparent data transmission terminal, and sends it to the GSM network after protocol encapsulation

2. Monitoring center:

the server applies for a fixed IP address, which is connected to the GPRS network by using the DDN dedicated line provided by the provincial mobile communication company. Because the DDN dedicated line can provide high bandwidth, when the number of environmental protection information collection points increases, the center can meet the demand without capacity expansion