| Recent years have witnessed the great development in Micro-electronics Technology and Information Science. With this development, the traditional production technology used in Agriculture is also changed towards much more automated and more intelligent. Based on the practical conditions of our country's agriculture production, a new system used for tele-monitoring the agricultural production environment was proposed and designed. This system has integrated the General Packet Radio Service (GPRS) Technology and Modern Sensor Technology on the platform of the Embedded System of ARM & Linux.In order to satisfy the need for monitoring all kinds of environment factors in agricultural production, this dissertation has presented a data acquisition system based on the ARM9 processor AT91RM9200 and Linux Operating System. The MAX146 SPI interface analog to digit converter was adopted to construct the data-acquisition module, which can communicate with the control host through serial interface. As for the requirement of monitoring the farm scenery more rapidly and more conveniently, such as the crop growth & development and animal activities, a live camera was fixed in the system which can present synchronous images transmitted from the field spots. Be connected to the control host with USB interface, the camera can play the image acquisition task at a fast speed of 50 frame per second. The Siemens' high quality GPRS module MC39i was applied to realize the communication between wireless terminal control net and the distant Internet server. Images acquired from the agricultural spot can be transmitted to the central database server and saved by Socket programming technology. The software realization has applied the modular structure and multithreading strategy, which realized the high speed, multi-channel data acquisition.After realized in our lab, this tele-monitoring system has been applied in many areas such as Beijing, Tanjin and Henan Province. These real engineering applications have proved the feasibility of the system and improved the realization in some technologies. Many cases have shown that the system can be assembled conveniently on the agriculture spot and work efficiently on data acquisition and control. These applications also indicate that this system has greatly promoted the level for visualized agricultural monitoring and management and is suitable for many agricultural monitoring applications. It is believed that this system has great advantages in both agricultural production and scientific research. |
