Design Of Farmland Irrigation Water Flow Auto-Monitor System Based On GPRS

China is one of the thirteen countries which is the most lack of freshwater resources per capita in the world, therefore effective water-saving measures for the sustainable utilization of water resources has important significance. China is a big country of agriculture, irrigation water waste is an important reasons causing huge loss of agricultural water resources, so the research of irrigation water the equipment model and the traditional water method innovation is to ensure the priority among priorities water-saving measures can be implemented, irrigation science modernization is not only reasonable scheduling of irrigation water, water plan, strengthen the correct implementation of necessary measures of water management, but also is a measure of the management of irrigation and irrigation water use efficiency is an important technique means the.Agricultural water mainly through water distribution channel for irrigation, the traditional method to estimate the traffic caused great waste of water resources, so the implementation of water distribution channel flow real-time automatic monitoring is necessary to. The amount of irrigation water management mainly includes the channel of each measuring point data acquisition level, open channel flow monitoring and water planning work, the real-time monitoring of open channel flow is one of the core contents. Scientific and automatic management of irrigation water is not only the inevitable trend of modern agricultural irrigation management intelligent, marked but also the traditional water conservancy to modem water resources evolution. Therefore, the research and design of irrigation channel flow monitoring system of a high measurement accuracy, stable performance, for the development of water-saving agriculture, promote the construction of water conservancy information has important significance.Based on the above reasons, this thesis combined with irrigation, using GPRS wireless communication network, designed the GPRS irrigation water distribution channel flow automatic monitoring system base. The device is a system of monitoring the flow of irrigation water distribution channel which uses ultrasonic liquid level sensor, current meter stepper motor and other components. The collected data will be transmitted to the host computer for analysis through GPRS wireless module. The system realizes automation and information of irrigation flow measurement system at a low cost to realize, and the field without person on duty, save manpower and material resources.Combined with "design of farmland irrigation water flow auto-monitor system based on GPRS", the topic completed the following research contents of several parts:(1) According to the application demand of subject, research on key technologies involved in the system, determine the overall design scheme of the whole project.(2) Determination of farmland water distribution channel level using ultrasonic liquid level sensor, according to the relationship between ultrasonic velocity and temperature, select the appropriate sensor and design of temperature compensation circuit are corrected, so as to improve the measurement accuracy.(3) Determination of farmland water distribution channel velocity using current meter. Study on the method of measuring, surveying calculation of the average vertical velocity of the Pulang Carmen log mode, so as to improve the accuracy of measurement of the average velocity section.(4) Automatic tracking device velocity designs a fixed proportion. The mechanical properties of the step motor positive inversion, the stepper motor is connected to the velocity tracking on Carmen logarithmic model integrating method position, automatic tracking measurement of average water flow channel section.(5) Design and selection of hardware, software and data acquisition instrument, in low power principle, guarantee the site data acquisition instrument can accurately work in an unmanned operation conditions.(6) According to the characteristics of each monitoring site in long distance, the optimal selection scheme and the appropriate GPRS module of wireless transmission equipment GPRS DTU, using the GPRS signal is sent to the monitoring center of the monitoring. (7) Use "KingView6.55"software which is developed by Beijing Asia Technology Development Company to design flow monitoring software, and achieve data reception inquiries, monitoring orders statistical analysis and other functions...