Design And Key Technology Research Of Geomagnetic Data Acquisition And Analysis System Based On Cloud Computing

The magnetic field is one of the basic properties of the earth.Geomagnetic field anomalies,as for the most likely sign of earthquake pregnancies in the field of earthquake prediction.The National Geomagnetic Network has published highprecision geomagnetic element data collected by professional equipment through the construction of geomagnetic stations to promote research in related fields.However,there are some limitations in obtaining geomagnetic source data form this way.First,for short-period geomagnetic anomalies,subscription sharing of data is not an effective mechanism for users to provide support for obtaining detailed data near anomalous time points.Secend,the maximum collection rate of geomagnetic data is 32 Hz,and most of them for only 1Hz.The collection interval of milliseconds or even lower cannot be satisfied.Third,due to earthquake's randomness,It's costeffectiveness of deploying multiple monitoring stations on a large scale is relatively low.In order to solve the above problems,a data collection and analysis system suitable for small research teams is designed,which combines the functions of collection,analysis and result feedback of geomagnetic data.The system associates geomagnetic anomalies with device acquisition behavior by means of cloud computing and the mode of acquisition device,and provides more method to analysis,verification backtracking conclusion.And the system is easy to expand,customize and maintain.In this paper,the characteristics of geomagnetic data collection and equipment are summarized,and combined with the existing system scheme.An improved HMA(Hierarchical Master-Worker Architecture)system model based on Master-Worker cluster working model is proposed,which makes it suitable for the system described in this paper.Based on HMA model,the system design scheme and expected functions are formulated.In the research of geomagnetic data acquisition platform adapting technology,through the design and customization of sensor nodes,gateway nodes and public cloud services,the general hardware or public cloud services are regulated or defined to provide basic functions for system operation.In the research of geomagnetic change data acquisition assurance technology,the hard magnetic interference and accidental interference that may be encountered in the process of conventional environment acquisition are eliminated by using the improved correction algorithm of electronic compass sensor and data acquisition filtering strategy of dual geomagnetic sensor operation mechanism.Through the shell script to schedule the system functions,and then realize the abnormal link mechanism in the process of geomagnetic data collection.System functions are tested in a conventional geomagnetic environment.The combination of sensor calibration and acquisition strategy is proved to be resistant to hard magnetic interference and accidental interference which may affect the geomagnetic acquisition data in the conventional environment.It can collect data with magnetic field intensity change at 30 n T level and magnetic azimuth change above15'.It can discriminate geomagnetic anomalies and collect equipment linkage based on cloud computing platform.The mechanism can provide up to 160 Hz geomagnetic acquisition data at the time of anomaly,and perform frequency domain calculation below 80 Hz through the function calculation module of edge gateway,which makes it possible to further study the time-frequency characteristics of data at the time of geomagnetic anomaly.