| Precision Agriculture, or precision agriculture, and some also referred to as the number of agriculture (Digital farming), information on agriculture, computer-aided agriculture (Computer aided farming) and so on. Traditional agriculture to the growth of crops as a uniform object management, such as harmonization of tillage, planting, irrigation, fertilizing, spraying, etc., to meet the average yield in the control region, but rarely consider the entire field of blind investment and over-fertilization, application resulted in increased production costs and environmental consequences. The management of traditional agriculture is one of a unified management of the land, while ignoring the majority of the people and there are differences in the space (Spatial variability).Precision agriculture are taken into account in the same area of farmland between the various soil fertility, texture, moisture content, organic matter, such as differences in conditions, as well as weeds, pests, disease heterogeneity occurred, and then to farming, fertilization, planting, irrigation , spraying and other operations in accordance with the specific circumstances at the time of local control in order to achieve better results. Its technology system is the basic connotation of the Global Positioning System (GPS), Geographic Information System (CIS), remote sensing technology (RS), computer technology, communications and network technology, automation technology and geography, such as high-tech, agriculture, ecology, plant physiology, soil science, meteorology and other basic disciplines combine. The implementation of the production process in agriculture on crops, soil from the macro to the micro-real-time monitoring, in order to achieve growth and development of crop conditions, pests, water environment situation and the corresponding regular access to information, generate dynamic spatial information system; on agricultural production in phenomenon, process simulation, to achieve the rational use of agricultural resources, lower production costs, improve the ecological environment, improve crop yield and quality, ensure sustainable agricultural development. Tiangeng precision agriculture as the basis of people from the land, planting, irrigation, fertilization, row, field management, plant protection, production forecast to harvest, preservation, management of the entire process to achieve accurate, networking and intelligent, all the applications of remote sensing, telemetry, remote control, computer and other advanced technologies to achieve information-driven agricultural production, scientific management, knowledge management, a reasonable operation. In recent years, a new concept of precision agriculture has begun to infiltrate the facility cultivation, horticultural precision, precision farming, precision operation and management with such precision and side.GPS high-precision, all-weather, global coverage, the characteristics of convenient and flexible, as a precision agriculture to support the implementation of the modernization of agriculture an important condition for the practice. GPS precise positioning through the use of access to the area of farmland affected crop yields and crop growth of the environmental factors of space and time difference information and analysis on the reasons for differences in cell production, and then the area in accordance with the different needs of crops to determine the actual needs of the inputs (planted, fertilizer, pesticides, irrigation water, etc.) in order to get the best output and the greatest economic benefits.Therefore, studying the development of GPS technology and applications for precision agriculture in China lay the foundation for the promotion and implementation of an important theoretical and practical significance. Agricultural operations on the positioning accuracy depends on the accuracy of farm machinery operation requirements. Stand-alone GPS positioning system precision agriculture are often unable to meet the requirements of high-precision positioning. As far as possible in order to obtain accurate positioning information, GPS data, the elimination of the satellite orbit errors, GPS Satellite Clock poor ionospheric delay and tropospheric delay error caused by SA, such as policy, in the implementation of precision agriculture is widely used in differential GPS (DGPS) technology. In this article the realization of spatial data collection is produced in the United States Trimble company, composed of two DGPS receivers AgGPS132 system. AgGPS132 is a 12-channel with differential correction of GPS receivers. The United States can receive satellite signals, it locked up to 12 satellites at the same time. Observed value of C / A code pseudo-range to work DGPS positioning accuracy within 1 meter.In this paper, GPS-based applications on the basis of a study for the control of ARM9-S3C2410A core variables of the automated application control system. Design of the ARM core board, including the ARM9 processor, Flash memory, SDRAM, download line interface,SD Card, such as the most basic part of it; completed the expansion of other functional circuits, including the GPS input interface circuit, keyboard and LCD circuits, the output signal driver circuit, and system power supply circuit and the core power supply circuit board. Through the program enabling the system to complete the entire process: In the automatic mode, the system will read GPS signals to the microprocessor, the processing speed of the machines to be, as well as the latitude and longitude, latitude and longitude derived by calculating machines where fertilization of the land number, and then query the operation unit corresponding to the decision-making fertilizer, and real-time in the LCD screen displays the current location, speed and fertilization level. Finally, the required fertilizer formula to the number of stepper motor, the rotation frequency pulse into a stepping motor-driven rotation axis in order to achieve speed control of variable rate fertilization fertilization. At the same time, we can also directly in the manual mode of operation of machines in cell fertilization in fertilizer and in edit mode to modify the decision-making fertilizer, and fertilizer to reach the purpose of flexibility.Precision Agriculture involves the information technology, biotechnology, agricultural technology and engineering technology needed to support decision-making expertise and knowledge, the need for interdisciplinary and multi-sectoral alliance to jointly promote the development of precision agriculture in China.
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