Detecting Electromagnetic Geographical Environment Changes Based on the Frequency-Intensity Curve

Yi Huang,Yehua Sheng,Mengyi Wang,Haiping Zhang,Jiarui Qin,Xiangqiang Min,Lizhi Miao,Qianqian Qiu,Manel Gasulla

doi:10.1155/2021/8819402

Abstract

Electromagnetic geographic environment is closely related to human life. With continuous popularization of public infrastructures and daily electronic instruments, such as electric power communication systems and household appliances, electromagnetic radiation sources have increased sharply in the geographic environment, which leads to increasingly serious electromagnetic radiation pollution. Thus, it is significant to monitor, evaluate, and analyze the electromagnetic radiation condition and explore its changing law in the environment. However, the traditional monitoring method can only detect anomalies within certain frequencies in the fixed stations. To fill this gap, this research first develops a vehicle-mounted electromagnetic environment monitoring system to collect both spatial positioning data and electromagnetic data of the whole frequency range. The acquired data are then used to construct the location-based frequency-intensity curve to reflect the variation of electromagnetic radiation at different frequency ranges. On this basis, a curve similarity measurement method is introduced to analyze the similarity of different curves, which is effective to diagnose time-varying sources from both global and local perspectives. This research provides a real-time mobile monitoring method, which is significant to know the dynamic variation of local electromagnetic environment and promotes subsequent comprehensive geographic analyses.

Highlights

Electromagnetic environment is an external manifestation of electromagnetic space, which refers to the sum of all electromagnetic phenomena existing in a certain time, space, and frequency [1,2,3]
This research first breaks through the limitation of the traditional electromagnetic monitoring method and develops a vehicle-mounted electromagnetic environment monitoring system (VEEMS) to collect the electromagnetic data of the whole frequency range
The results show that when VEEMS approaches ID 393, the similarity exceeds the given threshold only at the frequency band of 10 M~20 G for the high-frequency electric field, which indicates that ID 393 has a relative drastic anomalous change at this band compared with its neighboring points

Summary

Introduction

Electromagnetic environment is an external manifestation of electromagnetic space, which refers to the sum of all electromagnetic phenomena existing in a certain time, space, and frequency [1,2,3]. It is urgently needed to establish an automatic method to diagnose spatial variation by mobile measurement, which is the primary step for detecting changing electromagnetic phenomena and their corresponding frequency bands, searching unknown radiation sources To overcome these deficiencies, this research first breaks through the limitation of the traditional electromagnetic monitoring method and develops a vehicle-mounted electromagnetic environment monitoring system (VEEMS) to collect the electromagnetic data of the whole frequency range. The similarity of electromagnetic frequency-intensity curves of adjacent sampling points is analyzed to detect anomalous changes in different locations and bands It provides clues for searching potential radiation sources, improves the scientific management level of electromagnetic geographical environment, and lays a foundation for further environmental analysis and evaluation. The conclusions and future works are discussed in the last section

Development of VEEMS and Data Organization

Construction of Electromagnetic Anomaly Detection Method

Anomaly Detection and Analysis for Electromagnetic Environment

Conclusions