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The Measurement and Evaluation of the electromagnetic environment from 5G Base Station

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Detection 2022年第1期9卷 1-11页

作者： Weiwei Huang Yanan Hu Jinjun Zhu Zenan Cen Jiali Bao Research Team of Biophysics and Medical Engineering Bioelectromagnetics Laboratory of Zhejiang Province School of Medicine Zhejiang University Hangzhou China

In order to evaluate the electromagnetic environment of 5G base station, measurement and evaluation of the electromagnetic environment are studied. The 12 measuring points are chosen on the roof, inside and outside of the building, which has a 5G base station on the top. The electric field intensity, magnetic field intensity, and power density have been measured. The measurement methods include background measurement and work measurement. Background measurement is the measurement of environmental electromagnetic field (EMF) before the installation of 5G base station while the working measurement is the measurement after the installation of 5G base station. The evaluation methods include t-test for qualitative evaluation and electromagnetic gain for quantitative evaluation. The results show that the electromagnetic environment after the installation of 5G base station in most places is different from that in the background. And the environmental electromagnetic fields in certain parts are lower than those in the background. The conclusions are as follows: 1) The electromagnetic environment of 5G base station is far lower than the control limit of the national standard and conforms to the national standard;2) The electromagnetic environment of 5G base station has little impact on the electromagnetic environment;3) It is not sufficient to assume that 5G is harmful to health without the results of the epidemiological investigation;4) Before the construction of 5G base station, do background EMF detection, which can provide support for future evaluation.

关键词： 5G Base Station electromagnetic environment Health Biological Effects

Virtual Implementation of Radar Full Pulse Description Word for Battlefield electromagnetic environment

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Virtual Implementation of Radar Full Pulse Description Word ...

An Estimate Method for electromagnetic environment Test Based on Simulation Data

第30届中国控制与决策会议

作者： Chunxu Li Zhuojun Xu Chengzhi Yang Hongchao Wu Yantao Tian College of Communication Engineering Jilin University Aviation University of Air Force

In view of the problem that the current electromagnetic environment platform is not able to provide the real signal source for electronic reconnaissance, in this paper the complex electromagnetic environment faced by modern warfare is analyzed, and design the electromagnetic environment platform which can provide an approximate real environment for cognitive reconnaissance. Based on the signal feature modeling and the calculation of the feature parameters, the platform can obtain the approximate radar pulse data, and through the data fusion and coding, can get the approximate battlefield electromagnetic environment data, and show the data through the chart. The data can be more effectively applied to the process of modern radar reconnaissance signal processing, and provide a more realistic platform for the modern war in the cognitive reconnaissance. Experiments show that the generated data has the better similarity as the real battlefield data, and can provide the data source for the signal processing.

关键词： electromagnetic environment Modern War Cognition Reconnaissance Signal Processing

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An Estimate Method for Electromagnetic Environment Test Base...

electromagnetic environments in roadways of underground coal mines and a novel testing method

The 8th International Symposium on Antennas,Propagation and EM Theory（ISAPE2008）

作者： Yu Jing 1,Wen Ding-e 2,Zhang Qi 3,Wu Nan 4,Liao Rong-tao 1 The National Key Laboratory of EMC,China Ship Development and Design Center Wuhan,430064,China School of Computer Science and Technology,Huazhong University of Science and Technology,Wuhan,430074,China

An estimate method based on the result of electromagnetic filed simulation is proposed for practical electromagnetic environment *** to the trend of numerical result and the electromagnetic field strength obtained from one test point,electromagnetic field distribution of other places can be computed *** feasibility and accuracy are discussed in this *** the impact of the distance between test point and radiation source is also *** the method proposed is simple to use,it seems attractive for those testers who are willing to improve test efficiency and avoid being hazard by the high power radiation.

关键词： electromagnetic environment Simulation Result Test Data Estimate Method

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Mining Science and Technology 2010年第2期20卷 244-247页

作者： SUN, Jiping WANG, Fuzeng PAN, Tao TANG, Liang WANG, Shuai MING, Yanjie state key laboratory of coal resources & safe mining china university of mining & technologybeijing 100083china state key laboratory of coal resources & safe mining china university of mining & technologybeijing 100083china college of information science & technology agriculture university of hebeibaoding 07 china software testing center beijing 100048china

The electromagnetic environment of laneways in underground coal mines is an important area for the design of new electronic products,as well as a fundamental space for mine monitoring,surveillance,communications and control *** investigation of electromagnetic interference in coal mines is essential for the enhancement of performances of these *** this study,a new field method is provided in which radiated emission tests in coal mine laneways have been carried *** conclude that:1) the wiring motor vehicles can radiate interference with a bandwidth up to 1 GHz and with an amplitude 10 dBμV/m higher than the background noise;2) the PHS(Personal Handy phone System) mobile communication system can cause interference 40 dBμV/m higher than the background noise;3) an interference 25 dBμV/m higher than the background noise can be generated during the communication at a working bandwidth of 48.8 MHz;and 4) power cables,battery vehicles as well as mechanical and electrical dong rooms have little effect on the electromagnetic radiation environment in coal mine tunnels.

关键词： roadway electromagnetic environment electromagnetic radiation electromagnetic interference

Research on electromagnetic Compatibility of Chinese High Speed Railway System

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Chinese Journal of Electronics 2020年第1期29卷 16-21页

作者： WEN Yinghong HOU Weixing Beijing Jiaotong University National Railway Administration of the People's Republic of China

From technology importation to independent innovation, Chinese High speed railway(HSR)has been rapidly developed in the past a few ***, this technology development mode introduces very complex electromagnetic environment of HSR system,which is based on various equipment with different electromagnetic compatibility(EMC) design. Consequently,the suppression of electromagnetic disturbance and the electromagnetic protection is becoming an urgent issue for HSR. The characteristics of traction power supply technology, train operation control technology and other core technologies are quite unique in Chinese HSR. In this paper, the EMC and the electromagnetic safety issue of Chinese HSR is discussed, which is derived from technology development mode and core technology characteristics. The limitation of the high speed train’s exportation due to the lack of test method for the train’s emission is also analyzed. Combining the electromagnetic environment characteristic and the development planning of Chinese HSR, several suggestions in the research of antielectromagnetic interference, electromagnetic protection in the strong electromagnetic field and the whole large system’s radiation emission test method are put forward.

关键词： High speed railway electromagnetic compatibility electromagnetic environment

Current Status and Main Scientific Outcomes of the CSES Mission

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空间科学学报 2022年第4期42卷 550-564页

作者： ZEREN Zhima HUANG Jianping LIU Dapeng YANG Yanyan YAN Rui ZHAO Shufan ZHANG Zhenxia LIN Jian CUI Jing CHU Wei WANG Qiao LU Hengxin XU Song GUO Feng YANG Dehe ZHOU Na LIU Qinqin HUANG He WANG Jie TAN Qiao LI Wenjing LÜFangxian ZHU Keying SHEN Xuhui National Institute of Natural Hazards Ministry of Emergency ManagementBeijing 100085

This report briefly introduces the current status of the CSES(China Seismo-electromagnetic Satellite)mission which includes the first satellite CSES 01 in-orbit(launched in February 2018),and the second satellite CSES 02(will be launched in 2023)under *** CSES 01 has been steadily operating in orbit for over four years,providing abundant global geophysical field data,including the background geomagnetic field,the electromagnetic field and wave,the plasma(in-situ and profile data),and the energetic particles in the *** CSES 01 platform and the scientific instruments generally perform *** data validation and calibration are vital for CSES 01,for it aims to monitor earthquakes by extracting the very weak seismic precursors from a relatively disturbing space electromagnetic *** this purpose,we are paying specific efforts to validate data quality *** the CSES 01 observations,we have obtained many scientific results on the ionosphere electromagnetic environment,the seismo-ionospheric disturbance phenomena,the space weather process,and the Lithosphere-Atmosphere-Ionosphere coupling mechanism.

关键词： CSES mission Satellite platform Scientific payloads Data validation electromagnetic environment Seismic-ionospheric disturbance Space weather process

A Prediction Model of MF Radiation in environmental Assessment

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Biomedical and environmental Sciences 2006年第5期19卷 405-408页

作者： HE-SHAN GE YAN-FENG HONG Institute for environmental Health and Related Product Safety China CDC Beijing 100050 China

Objective To predict the impact of MF radiation on human health. Methods The vertical distribution of field intensity was estimated by analogism on the basis of measured values from simulation measurement. Results A kind of analogism on the basis of geometric proportion decay pattern is put forward in the essay. It showed that with increasing of height the field intensity increased according to geometric proportion law. Conclusion This geometric proportion prediction model can be used to estimate the impact of MF radiation on inhabited environment, and can act as a reference pattern in predicting the environmental impact level of MF radiation.

关键词： MF radiation electromagnetic environment Predictive model environmental impact assessment

Survey of Technologies of Line Commutated Converter Based High Voltage Direct Current Transmission in China

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CSEE Journal of Power and Energy Systems 2015年第2期1卷 1-8页

作者： Zehong Liu Jun Yu Xianshan Guo Tao Sun Jin Zhang State Grid Corporation of China Beijing 100031China

This paper reviews the applications of line commutated converter based high voltage direct current transmission(LCC-HVDC)technologies in China,with a special focus on UHVDC technology developed in the last 10 *** paper examines six specific aspects of areas—voltage increase,capacity upgrade,reliability improvement,engineering design innovation,equipment and materials innovation,and the R&D of next *** advances in LCC-HVDC technologies in recent years are also discussed.

关键词： ±800 kV electromagnetic environment main circuit UHVDC

A Method for Evaluating the Performance of Unmanned Aerial Navigation Systems Based on Fuzzy Decision Trees

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A Method for Evaluating the Performance of Unmanned Aerial N...