Research On Internet Of Things Communication Technology And Its Application In Geomagnetic Monitoring

Since entering the 21st century, the earth’s crust activity into the active, the more destructive larger earthquake occurred on people’s lives and property caused heavy losses. But for this common earthquake prediction of natural disasters, especially accurate imminent prediction is still recognized worldwide problem. Earthquake researchers’comprehensive large earthquake examples and the geomagnetic signal of before the earthquake in the research and analysis found that the geomagnetic anomaly signal and earthquake precursor has certain correlation, the correlation research is an effective method for earthquake early warning. But the current domestic small number of existing monitoring and distribution of geomagnetism fragmented and needed more surveyors flow measurements, that is not conducive to the geomagnetic data for continuous, real-time, accurate access. In recent years, even with the high-speed、large storage capacity geomagnetic data logger, but there is a single communication networking is not perfect or loss of function and so on.Based on the above problems, this paper proposed and implemented a network distributed monitoring method based on the geomagnetic data of Internet communications. In this design, distributed around the magnetic monitoring terminal of geomagnetic data will be collected according to the actual situation through Internet communication technologies such as Ethernet, GSM/GPRS and WiFi upload data to the distant communication gizwits cloud server, data processing and data analysis of the work to be done by the server. The advantage of using a mesh distributed data acquisition mode that reduces the need for storage capacity and processing speed of the geomagnetic monitoring terminal requirements, cost savings, reducing the impact of external factors on the system, statistical methods can be used to determine whether an area geomagnetic anomaly occurred, in order to determine the possibility of earthquakes.This paper designed geomagnetic monitoring terminal is a geomagnetic sensor acquisition, signal processing, transmission and control in one of the data processing terminal. The program is based on Cortex-M3 microcontroller core stm32F107 and Ethernet PHY chip DM9616A、WiFi chips ESP8266、GSM/GPRS core chip SIM900A geomagnetic monitoring system. This paper describes the design scheme of the system、the relevant parts of the composition、the principle and the way to realize the function; Then introduced the monitoring terminal communication module、the periphery of the geomagnetic signal acquisition circuit, single chip microcomputer circuit and the design of power circuit, also introduces the STM32F107,monitoring terminal’s WiFi chip communication module, Ethernet communication module, GSM/GPRS communication module and the hardware circuit design of magnetic signal acquisition circuit. Then respectively introduces the transplantation of LwIP protocol and implementation as well as magnetic monitoring terminal communication module software driver design, data acquisition module software design、operation process and gives the relevant communication protocol. In addition, this paper proposed in terms of hardware and software design of system anti-interference and stability of the method and strategy.Finally, the system of each communication mode and data acquisition combined with PC and mobile phone APP has carried on the relevant experiments and tests. The test results show that each module communication is normal, and can geomagnetic anomaly threshold, the correction parameters are set according to the actual situation, the geomagnetic monitoring terminal acquisition speed, high real-time transmission, real-time display, conform to the system of the original design purpose.