China is a major agricultural country with severe water shortages and drought. Effective drought prevention, drought relief, and reduction of various losses caused by drought have become one of the most important tasks of flood control and drought relief departments. Information collection and rapid monitoring of soil moisture is an effective means to prevent and control the development of drought.
Nowadays, there are many instruments for collecting soil moisture, such as GPRS soil moisture monitoring system and multi-function soil moisture recorder, which are several soil moisture instruments. However, most of them can only measure a single location or a small area of ​​farmland, and can not carry out soil moisture monitoring in a large area (such as a large area irrigation area, farmland, a city or a province). In addition, many sites that require soil moisture monitoring are in the wild and are so smoky that it is difficult to conduct long-term fixed continuous observations using existing instruments for soil moisture monitoring at these locations. Therefore, it is a new entry point to increase the wireless communication function and the solar continuous charging function of the soil moisture monitoring system. It is precisely because of these needs that the GPRS soil moisture monitoring system came into being.
Soil moisture information collection and remote monitoring system The soil moisture tester consisting of SWR soil moisture sensor, soil moisture data collector, soil moisture data receiver and soil moisture remote monitoring computer is also called wireless public opinion monitoring system.
SWR type soil moisture measurement is a rapid measurement method of soil moisture based on standing wave principle. It has a relatively stable measurement accuracy and a wide range of uses. The sensor is buried in the soil and directly obtains the soil moisture information at various depths from 0 to 100 cm below the surface, and converts it into a 0~5V analog voltage signal.
The soil moisture data collector is used to receive the soil moisture information of the sensor on the one hand, and the soil moisture information is transmitted to the soil moisture data receiver installed in the monitoring center by using GSM wireless short message. In a soil moisture monitoring system, there may be multiple soil moisture data collectors according to needs, and each collector can be used as a soil moisture fixed monitoring station, which is distributed at different characteristic points in the area to collect soil moisture information. In one system, there is only one soil moisture data receiver, which cyclically receives the information sent by different collectors, and transmits the soil moisture information to the soil public opinion remote monitoring computer through the RS232 serial communication protocol. In the monitoring computer, SuperGIS is used as the secondary development platform for software development, and all soil moisture information is analyzed and counted, and then the soil moisture in the area is monitored.
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