Wireless data transmission radio is widely used in many fields

　　The data transmission radio station / module is widely applicable to all kinds of point-to-point and point-to-multipoint wireless data transmission systems, such as power load monitoring, distribution network automation, hydrological and hydrological situation measurement and reporting, tap water pipe network monitoring, urban street lamp monitoring, air defense alarm control, railway signal monitoring, centralized control of Railway water supply, oil and gas supply pipe network monitoring, GPS positioning system, remote meter reading Industrial automation systems such as sewage treatment.

　　■ differential GPS positioning

　　DGPS, namely differential global positioning system (DGPS), is based on GPS and uses differential technology to enable users to obtain higher accuracy from GPS system.

　　DGPS actually puts a GPS receiver on the point whose position has been accurately measured to form a reference station. The receiver of the reference station measures and calculates the pseudo range to the satellite by receiving the GPS satellite signal, compares the pseudo range with the known accurate distance, obtains the pseudo range measurement error of the point in the GPS system, and then takes these errors as correction values to broadcast them to the surrounding space through the broadcasting station in the standard data format. DGPS users nearby receive the error correction information from the reference station to correct their own GPS measurement values, so as to greatly improve their positioning accuracy.

　　The error of the same user's choice is the difference between the same base station and its availability in the same area. The application of differential technology can effectively weaken SA, ionospheric delay, gas layer delay, ephemeris error and satellite clock error, and achieve meter level positioning accuracy. At present, the daily precision high-speed data transmission radio has been more and more widely used in the differential GPS system.

　　■ several forms and components of point-to-point wireless remote control system

　　Remote control system is widely used in the field of industrial automation, such as controlling the switch of remote indicator light and controlling the operation and termination of some electrical equipment. In fact, this kind of application uses wireless channel to transmit switching value signal.

　　In some special applications, for example, when the distance is relatively close, but the wiring is difficult or far away, the wiring needs to erect cable poles, or dig cable trenches, most of them adopt the way of wireless transmission. In the data communication unit, the rijing professional data transmission radio (module) series is adopted, which is mainly suitable for the environment with strict real-time control requirements and poor environment without GSM public network coverage. The requirements for the stability of the equipment are very strict. The rijing professional data transmission radio (module) series is adopted to ensure the stable and reliable operation of the products.

　　■ multi channel sewage treatment flow monitoring, management and control system

　　The remote communication transmission system is composed of a main control computer, multiple multiplexers, flow meters and telephone network. One computer can remotely monitor multiple sewage outlets, display instantaneous flow, cumulative flow, daily flow, annual flow, discharge curve and print reports at the same time. The discharge conditions of different discharge outlets in the same period and different periods of the same discharge outlet can be compared. The data stored in the system can be backed up automatically, and the system can set a password. The daily precision data transmission radio / data transmission module can be used in the sewage treatment project to monitor and control the production process of each pump station of the sewage plant in real time, which greatly improves the work efficiency of production scheduling and management, and lays a reliable technical foundation for the whole production scheduling, monitoring and management system. The main function of sewage treatment dispatching remote monitoring and data acquisition system is to fully understand various parameters of relevant sewage treatment pump stations through the central station; The central station comprehensively processes the collected parameters, provides them to decision makers with a good interface, and issues instructions to corresponding devices to improve the production process.

　　■ gas pipeline leakage monitoring, sewage pipeline detection, gas pipeline detection, oil pipeline detection and pipeline leakage detection system. China's urban residents and industrial transmission pipelines are increasing day by day, such as gas transmission pipelines. At present, gas transmission pipelines are common in major cities, so gas pipeline leakage and flow monitoring are particularly important. Gas pipeline detection stations are widely distributed and far away, so it is difficult to use wired network communication. Data communication is realized by wireless communication, which has the advantages of convenient installation, convenient maintenance and migration and low cost.

　　For pipeline monitoring, we collect pressure, temperature and flow signals through the terminal and send them to the central control room regularly. Once any abnormality is found, the central control room will give an audible and visual alarm. This detection mechanism can almost be unattended.

　　■ urban lighting and street lamp monitoring system

　　Facing the tense situation of power supply, street lamp inspection is a labor-intensive work for municipal departments. The use of advanced street lamp monitoring system can uniformly turn on and off the city's street lamps, monitor and manage the night scene lighting system and street lamps in real time, ensure efficient and stable, all-weather operation, control unnecessary "all night lamp lighting" and effectively save power consumption.

　　■ vehicle dispatching system

　　The vehicle dispatching system adopts a wireless communication system with large capacity, high speed and multiple functions, which can form a wireless vehicle dispatching network with single base station, multi base station and even multi area coverage, so as to meet the modern needs of vehicle dispatching and management. The system consists of communication platform and dispatching center.

　　■ three remote and four remote system

　　Safe, reliable and continuous operation is the holding point of urban water supply and gas supply system, which is different from other industries. With the development of production, the traditional management method can not meet this requirement. Now, with the help of advanced computer technology and communication technology, we have established urban water supply and gas supply monitoring and data acquisition system, which has created conditions for the modern production management of urban water supply and gas supply departments. Enterprises can collect real-time parameters through the system and control the equipment to ensure the normal operation of water supply and gas supply system. At the same time, we combine office automation and automatic meter reading system to improve the production, scheduling and automatic management level of the enterprise. The system can be widely used in waterworks, mines, power plants and so on, so as to save electricity, water and reduce labor intensity.

　　■ automatic irrigation system

　　Automatic irrigation system is widely used in automatic or manual control of agricultural and garden irrigation. With the development of modern agriculture and forestry and the continuous appreciation of water resources, the traditional irrigation method is being replaced by the modern automatic control irrigation system. Compared with the traditional irrigation method, the automatic intelligent irrigation control system has the following advantages:

　　1. Microcomputer controlled sprinkler irrigation and drip irrigation can greatly save increasingly valuable water resources and have great social and economic benefits;

　　2. Different irrigation methods can be set according to the needs of plants for soil moisture to make plants grow according to the best growth cycle, so as to achieve the purpose of increasing production and income;

　　3. Automatic irrigation can greatly save human resources and improve labor productivity.

　　■ forest fire prevention monitoring system

　　Wireless remote monitoring system can monitor forest fire and abnormal conditions in real time. Different monitoring design and construction can be carried out according to the required monitoring range, monitoring distance and function. The monitoring points can be from one to multiple to all-round and all-weather monitoring. Because it is an intuitive monitoring, it can achieve fast response speed and accurate positioning of disaster points, which will play a decisive role in mastering the progress of disaster, on-site command and dispatching. Rt21-scada rail transit monitoring system adopts advanced computer technology and the latest international standards, and is based on the design ideas of layering, distribution, high reliability and high security. It is suitable for the power monitoring automation system of metro, light rail and other urban rail transit.

　　■ electrical SCADA system

　　Through the data exchange between the system and the integrated automation system, the system realizes the data acquisition of the equipment monitored by the system, including remote measurement, remote signaling, etc. The data in the system database, such as real-time data, historical data and statistical analysis data, can be displayed in the form of pictures, reports and curves provided by the system for analysis and use by the system operator to realize the monitoring of the system; According to the needs of the actual operation mode of the power system, the system operator uses the man-machine interface and other tools provided by the electrical SCADA system to change the operation mode of the power grid and realize the control function of the system.

　　For example, the power grid dispatching automation system is a modern power integrated automation system based on computer technology. It mainly provides power grid dispatching managers with all kinds of real-time information of power grid, manages and controls the dispatching decision-making of power grid, ensures the safe operation of power grid, improves the quality of power grid and improves the economy of power grid operation.

　　SCADA (supervisory control and data acquisition) is the data acquisition and monitoring control system, which mainly completes the collection, processing, interpretation, storage and display of data.

　　With the increasing expansion and complexity of the structure of the power system, in order to ensure the safety and economy of the operation of the power system, the dispatching and operation personnel are required to quickly, accurately and comprehensively grasp the actual operation state of the power system, predict and analyze the operation trend of the power system, and correctly deal with various problems in the operation of the power system.

　　■ water well remote monitoring system

　　The water well remote monitoring system can collect various analog signals and switching signals such as voltage, current and water level, collect and judge the operation of the machine, and give alarm and protection signals. All data are connected to the SCADA system of the data center through wireless data transmission. It can be controlled on site or remotely by remote personnel on duty according to real-time data. Realize timely fault detection, well shutdown maintenance and remote control room pumping. Through remote setting, automatic well shutdown and automatic inter pumping can be realized. So as to reduce the workload of well inspection, reduce equipment damage, reduce energy consumption and improve pump efficiency and benefit.

　　SCADA automatic control system of water supply network is mainly used to monitor and control the water source well measurement station and the lifting pump of water plant. The SCADA monitoring center, the measuring points of water source well pipe network and the water plant adopt data transmission radio through wireless transmission.

　　The whole system is divided into one main station and several sub stations. The central station is set in the dispatching center, and the external stations are set at the measuring points of the water source well pipe network respectively. The data transmission radio is directly connected with the terminal, which can collect various data such as water level, pressure and flow and control the operation of the lifting pump at the measuring points of the water source well pipe network.

　　■ remote real-time monitoring system for water treatment

　　The remote real-time monitoring system for water treatment uses modern communication technology, computer technology and automatic monitoring instruments to conduct remote real-time monitoring of various remote equipment, water quality, flow and other parameters, which can realize the automation and informatization of environmental management. The remote real-time monitoring system for water treatment is composed of a computer-controlled monitoring center and several sub stations. The system centralizes the control of water quality An online water detection system.

　　■ hydrological and meteorological multi parameter automatic monitoring system

　　The telemetry system can collect hydrological and meteorological elements such as rainfall, evaporation, water level (tide level), air temperature, air pressure, humidity, wind speed and wind direction. The system is mainly composed of two parts: survey station and central station:

　　Measuring station: it is an unattended telemetry station. Once installed, it can automatically send the collected parameter values to the central station through the radio station without personnel management (the timing time is selected by the user according to the actual needs). The main work of the station is completed by the intelligent terminal. In addition to the rainfall and evaporation events triggered by the last station, the automatic collection of rainfall and evaporation parameters is carried out by the radio station. In addition, the automatic collection of rainfall and evaporation events is carried out by taking into account the real-time change of rainfall and evaporation, The survey station automatically sends data to the central station.