Intelligent remote monitoring system for water conservancy is a kind of integrated application of advanced GSM SMS, GPRS, GIS, electronic control technology and computer processing technology for long-distance monitoring of water conservancy. Accurate and efficient information management system. Flow monitoring uses “integrated wireless smart magnetostrictive water level flow meter or ultrasonic flow meter system with four integrated functions: measurement (measurement), mining (acquisition), transmission (GPRS wireless transmission), and electricity (self-contained batteries)â€. The equipment not only can accurately measure the real-time water level and flow of the water tank, but also can maintain a very low power consumption operation. At the same time, it can be transmitted to the irrigation area information center via the GSM/GPRS network in real time. The equipment works in a self-reporting manner: After the water level data is automatically collected according to the set time period, the instantaneous flow and cumulative flow data are calculated and stored in the memory, and can be reported automatically by SMS.
First, the design principle
The following principles must be followed when implementing the technical scheme of the intelligent water conservancy remote monitoring system:
1. reliability
The system must have a stable and reliable operating system. The backup and disaster recovery system should be fully considered in the design, so that the entire system can still provide customer service in the event of a failure, and can quickly eliminate the malfunction of normal operation.
2. Expandability and openness
The design should be based on the most economical principles, and the design-extensiveness is very strong, and the least wasted system during expansion and upgrade. The system design follows the principle of openness and can support multiple hardware devices and networks
System, software and hardware support secondary development. Network systems, database systems, and communication hubs use standard data interfaces and have the ability to exchange data and share data with other information systems. Computer network systems accommodate future wide-area expansion.
3. Safety, maintainability
The system must attach great importance to the security of data. Preventive measures must be taken to prevent intrusion of the black passengers. In addition, internal employees and dispatching customers must also strengthen privilege control to prevent users from being able to operate beyond the authority data. Provides automatic fault detection and
A certain degree of automatic recovery.
4. Real-time, parallelism
Considering the number of remote monitoring points for water conservancy, the system should adopt a network design with fast transmission speed to ensure the timely and effective environmental information data; at the same time, the system should avoid the use of round robin to conduct point operations, and the system should have automatic parallel data upload and Far away
The function of parallel monitoring of process monitoring points.
5. Remote monitoring of water conservancy, unattended.
Traffic calculation parameters that can be embedded in various channel types.
With high reliability, sealing, high strength, three anti-treatment, anti-corrosion, internal installation firm, suitable for unmanned environmental applications in the wild.
Stable and efficient transmission method. Using GPRS and SMS, data reporting and transmission.
SMS alert. If the water level is abnormal or the battery is low, the relevant personnel and the administrator's mobile phone of the control center will be automatically alerted to take time to take corresponding measures.
Ultra-low power consumption, short sampling time, very low power consumption during non-sampling, and self-contained lithium battery can meet long-term working requirements.
Built-in real-time clock can accurately record the sampling time.
The instrument is equipped with a large-capacity data memory (temporary 2G up to 16G) for long-term preservation of sampled data. Save all set parameters in the device's internal chip, even if the power-down data can be safely retained.
The instrument's built-in scientific digital filtering method and calibration function can effectively solve the effect of waves on the water level measurement, making the measured values ​​stable, real and reliable.
Realizes remote channel query from time to time, with regular reporting, response reporting, and suspected failure water level reporting.
Second, the network architecture
Zhitong Water Remote Monitoring System aims to establish an intelligent remote monitoring system based on mobile GPRS/GSM network and GIS platform to speed up the construction of water conservancy management informationization. The entire project fully reflects the idea of ​​system integration, and the network is in line with the overall planning and long-term development. The system design fully guarantees the scalability and scalability of the system at a relatively high starting point. It has considerable communication capacity, information capacity and processing capacity of computers and network equipment, and has certain advancement. It also reserves interfaces for hardware and software. It is easy to maintain, upgrade and expand to meet the requirements of the entire system development in the future.
Third, the system composition
Intelligent water conservancy remote monitoring system is mainly composed of three parts: information center, communication network, and water conservancy remote monitoring point.
1. information Center
The information center consists of a corresponding application server and a communication server. The communication server is used to communicate with various water conservancy remote monitoring points, and the application server is used to record relevant information of each water conservancy remote monitoring point.
2. Communications network
As the hub of information exchange between the information center and each water conservancy remote monitoring point, the communication network is the core part of the entire system. Its work feature is that the number of communications is very frequent, but each time the amount of communication transmission is small. Taking into account the future development of intelligent water conservancy remote monitoring systems and the scalability of the system, the system uses a dedicated line to access the mobile company's GPRS/GSM network. The terminal's information data is transmitted from the terminal to the GPRS® GSM network and is connected via a dedicated line and an intelligent water conservancy remote monitoring system. The intelligent water conservancy remote monitoring system and the GPRS/GSM network are protected by a firewall.
3. Remote monitoring point of water conservancy
Remote monitoring points of water conservancy use GPRS main and short message backup methods for data communication, and all information data is transmitted through GSM and GPRS networks.
Fourth, the network program
Taking into account the long-range water conservancy monitoring system capacity, monitoring points and scattered, the intelligent processing of information and analysis of the characteristics of demanding, the use of special line access and dedicated APN program. The use of a dedicated APN includes the following advantages: access control, better security than the Internet, improved controllability, and guaranteed network transmission priorities.
1. Internet connection
Intelligent water conservancy remote monitoring system and mobile GPRS network GGSN equipment, SMS gateways use 2M dedicated line. Each water conservancy remote monitoring point is connected to the communication server of the information center through a GPRS/GSM network using a GPRS terminal.
2. APN
In the public network, a dedicated APN is assigned to the intelligent water conservancy remote monitoring system. After the water conservancy remote monitoring point activates the PDP (Packet Data Protocol) context, it can transmit data to and from the service center. Provide SMS access for areas not covered by GPRS.
3. The connection between the center and the water conservancy remote monitoring point is maintained
Taking into account the status of the GPRS network, after the terminal of the water conservancy remote monitoring point is activated by the GPRS network, it immediately initiates a PDP (Packet Data Protocol) context activation request. The connection is maintained by the software of the upper computer adopting the heartbeat and the method of periodically checking the status of the GPRS network.
4.1P address allocation and authentication scheme
In the intelligent water conservancy long-distance monitoring system set up Radius server assigns the internal IP address for the water conservancy long-distance monitoring spot. After the water conservancy remote monitoring point terminal initiates a PDP (Packet Data Protocol) context activation request, the Radius server of the intelligent water conservancy remote monitoring system assigns an IP address to the MSISDN or IMSI number of the remote monitoring point terminal of the water conservancy if the Radius server supports it. Assigning a fixed IP address for each MSISDN or IMSI terminal can ensure that the IP address of each monitoring point terminal is fixed.
V. Communication process
1. Call initiation
The GPRS terminal carries the user name and password assigned by the information center to call the APN assigned to the water conservancy department. When the GPRS terminal establishes a call, the GGSN receives the terminal's mobile phone number, user name, and password.
2. Authentication authentication
The GGSN sends the call request and the mobile phone number, user name, and password to the information center Radius server. After receiving the call request from the mobile GGSN and the mobile phone number, user name, and password, the Radius server of the information center allocates the EPA's own IP address. The information center Radius server sends the IP address back to the GPRS terminal through the GGSN and GPRS other network devices.
3. Firewall filtering
The monitoring point GPRS terminal receives the IP address assigned by the information center Radius server, carries the address, passes the GGSN, and filters through the white list of the information center firewall.
4. Communication establishment
Each monitoring point is connected with the relevant communication server of the center, establishes the TCP/IP path, carries on the information data transmission and monitors the monitoring business processing.
Sixth, system characteristics
1. Low construction cost
The intelligent water conservancy remote monitoring system relies on a mature public network system, which does not require the construction of a separate network (base station and other equipment); it can provide a monthly subscription method with low use cost.
2. Wide range of monitoring
Since the communication means used is the public network, the effective range of the system is limited to the coverage of the public network. In other words, the network can be effectively monitored, and the expansion of the network means the expansion of the actual monitoring range.
3. Building block structure
Because the TCP/IP protocol and object-oriented design ideas are adopted directly, the system can support multi-level and multi-center building blocks with different sizes, and is applicable to information centers of different levels of authority.
4. Openness and portability
The application layer protocol based on TCP/IP has good openness and portability.
5. Advanced technology
Advanced GPRS technology is adopted to support the mobile monitoring terminal based on J2ME, providing a domestic and international leading remote water monitoring solution for the information center.
6. Data collection in parallel
Due to the use of advanced IP technology, the system can simultaneously collect and process various data from multiple remote monitoring points of water conservancy, and can synchronously synchronize the clocks of remote monitoring points of water conservancy without the need for round robin inspection.
Through the use of intelligent water conservancy remote monitoring system, it can greatly facilitate the work of the water conservancy monitoring department to ensure the accurate and effective transmission of the data of the remote monitoring points of water conservancy, so as to achieve the purpose of accurate decision-making.
The remote water monitoring system that uses the mobile GPRS/GSM network for transmission will realize automatic collection of hydrological data, long-term self-reporting, and digitization of storage information. It will surely promote the water conservancy informatization at all levels of the water conservancy departments, and will thus be driven by informationization. Promote the construction of water conservancy modernization.
Jinhu Weibao Trading Co., Ltd , https://www.weibaoxd.com