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HJ 972-2018 English PDF

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HJ 972-2018: Monitoring method for electromagnetic radiation environment of mobile communication base station
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Basic data

Standard ID HJ 972-2018 (HJ972-2018)
Description (Translated English) Monitoring method for electromagnetic radiation environment of mobile communication base station
Sector / Industry Environmental Protection Industry Standard
Word Count Estimation 15,152
Issuing agency(ies) Ministry of Ecology and Environment

HJ 972-2018: Monitoring method for electromagnetic radiation environment of mobile communication base station


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Monitoring method for electromagnetic radiation environment of mobile communication base station Mobile communication base station electromagnetic radiation environment monitoring method Monitoring method for electromagnetic radiation environment Of mobile communication base station Published on.2018-09-30 2019-01-01 implementation National Environmental Protection Standard of the People's Republic Ministry of Ecology and Environment release

Content

Preface ii 1 Scope.1 2 Normative references.1 3 Terms and Definitions 1 4 Monitoring conditions.1 5 Monitoring methods.3 6 Quality Assurance.5 Appendix A (Reference Appendix) Mobile Communication Base Station Electromagnetic Radiation Environmental Monitoring Record and Report Format 6

Foreword

In order to implement the "Environmental Protection Law of the People's Republic of China", prevent and control electromagnetic radiation environmental pollution, improve environmental quality, and standardize mobile communication base The station monitors the electromagnetic radiation environment and develops this standard. This standard specifies the technical requirements for the content and method of electromagnetic radiation environment monitoring of mobile communication base stations. This standard is the first release. This standard was formulated by the Department of Environmental Protection's Radiation Source Safety Supervision Department. This standard is mainly drafted by. Radiation Environmental Monitoring Technology Center. This standard is approved by the Ministry of Ecology and Environment on September 30,.2018. This standard has been implemented since January 01,.2019. This standard is explained by the Ministry of Ecology and Environment. Mobile communication base station electromagnetic radiation environment monitoring method

1 Scope of application

This standard specifies the technical requirements for the content and method of electromagnetic radiation environment monitoring of mobile communication base stations. This standard applies to the monitoring of electromagnetic radiation environment of mobile communication base stations outside the scope of exemption specified in GB 8702. Exempted management The electromagnetic radiation environment monitoring of the mobile communication base station can be performed with reference to this standard.

2 Normative references

The contents of this standard refer to the terms in the following documents. For undated references, the valid version applies to this standard. GB 8702 electromagnetic environment control limit GB/T 2900.1 Basic terminology of electrical terminology HJ/T 10.2 Radiation Environmental Protection Management Guide Electromagnetic Radiation Monitoring Instrument and Method HJ/T 10.3 Radiation Environmental Protection Management Guidelines Electromagnetic Radiation Environmental Impact Assessment Methods and Standards

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 mobile communication mobile communication The two parties to the communication or at least one of them exchange information during the exercise. Such as moving bodies (people, vehicles, ships, airplanes) and fixed Communication between points or between mobile bodies. 3.2 base station base station A terrestrial station in the land mobile service, a wireless transceiver device serving a cell or a plurality of cells at the same site. Base station passed The line interface provides a wireless channel to and from the terminal. 3.3 Electromagnetic radiation environment sensitive target electromagnetic radiation environment-sensitive target Electromagnetic radiation environment monitoring needs to focus on the object. Including residential, school, hospital, office building and factory, etc. Or study buildings.

4 Monitoring conditions

4.1 Environmental conditions The environmental conditions at the time of monitoring should be in accordance with the requirements of the instrument. 4.2 Monitoring instruments 4.2.1 Basic requirements The working performance of the monitoring instrument should meet the requirements of the electromagnetic field to be tested, and it can cover the transmitting frequency, range, and Resolution, etc. can meet the monitoring requirements. According to the purpose of monitoring, the monitoring instruments can be divided into non-selective broadband electromagnetic radiation monitors and frequency selective electromagnetic radiation monitors. Moving on When monitoring the electromagnetic radiation environment of a mobile communication base station, a non-frequency selective broadband electromagnetic radiation monitor is used; in the need to understand a plurality of electromagnetic radiation sources, each When the electromagnetic radiation contribution of the radiation source is used, the frequency selective electromagnetic radiation monitor is used. Monitoring instruments with isotropic response probes (antennas) should be used for monitoring. The monitoring results of the monitoring instrument should be selected from the rms value reading of the instrument. For the rms value, see GB/T 2900.1. 4.2.2 Non-frequency selective broadband electromagnetic radiation monitor It refers to the electromagnetic radiation monitor with the isotropic response value of the comprehensive value of the field strength at all frequency points in the instrument frequency range. In the case of environmental monitoring using a non-selected broadband electromagnetic radiation monitor, in order to ensure the quality of environmental monitoring, such instruments should comply with HJ/T 10.2, the basic requirements for its electrical performance are shown in Table 1. Table 1 Basic requirements for electrical performance of non-frequency selective broadband electromagnetic radiation monitor Project indicator Frequency response 800MHz~3GHz ±1.5 dB < 800MHz, or >3GHz ±3 dB Dynamic Range The lower detection limit of the probe is ≤1.1×10-4W/m2 (0.2 V/m) And the upper detection limit is ≥25 W/m2 (100 V/m) Isotropic response to the entire monitoring system to assess its isotropy, isotropic ≤ 1 dB 4.2.3 Frequency selective electromagnetic radiation monitor Refers to an electromagnetic radiation monitor capable of receiving and processing portions of the spectral components within the instrument's frequency range. According to the specific monitoring needs, frequency selective electromagnetic radiation monitors with different ranges and different frequency ranges can be selected. These instruments should meet the requirements. HJ/T 10.2, the basic requirements for its electrical performance are shown in Table 2. Table 2 Basic requirements for electrical performance of frequency selective electromagnetic radiation monitor Project indicator Measurement error < 3dB Frequency error < 10-3 orders of magnitude of the measured frequency Dynamic range minimum field strength ≤ 7 × 10 -6 W/m2 (0.05 V/m) Maximum field strength ≥25 W/m2 (100 V/m) Isotropic is within its measurement range, probe isotropic ≤2.5 dB 4.3 Monitoring conditions Monitoring is performed during normal working hours of the mobile communication base station.

5 Monitoring methods

5.1 Basic requirements Before conducting monitoring work, collect basic information of the mobile communication base station under test, including. base station name, operating unit, construction site, Longitude and latitude coordinates, network system type, transmission frequency range, antenna ground height, antenna bracket type, number of antennas, and operating status. Other information may be collected depending on the nature and purpose of the monitoring, including. transmitter model, nominal power, actual transmit power, antenna Parameters such as gain, antenna directivity type, and antenna direction angle. When monitoring with a non-selected broadband electromagnetic radiation monitor, if the monitoring result exceeds the evaluation criteria for individual items specified in HJ/T 10.3, The selected frequency should be selected and frequency-selected using a frequency selective electromagnetic radiation monitor to determine the work of the point in the range of the transmitting frequency range of the mobile communication base station. Rate density (or electric field strength) value. 5.2 Monitoring factors The monitoring factor of the electromagnetic radiation environment of the mobile communication base station is a radio frequency electromagnetic field, and the monitoring parameter is power density (or electric field strength). 5.3 Monitoring points The monitoring point is arranged in the cylindrical space with the ground projection point of the transmitting antenna of the mobile communication base station as the center and the radius of 50m as the bottom surface. Representative electromagnetic radiation is sensitive to environmental targets. When monitoring outside the building, the priority is placed in the public's daily life or working distance near the antenna, but it is not suitable to be deployed. A location (such as a ladder) or a special way (such as climbing). When the mobile communication base station transmitting antenna is a directional antenna, the point priority The layout is within the direction of the main lobe of the antenna. When monitoring in a building, the point is preferentially placed at the window (balcony) facing the antenna, and the probe (antenna) should be in the window frame (balcony) Within the interface, you can also select the center of the room. The distance between the probe (antenna) and equipment such as household appliances is not less than 1 m. 5.4 Monitoring height The measuring instrument probe (antenna) is 1.7 m from the ground (or foot plane). It can also be monitored at other heights as needed and in the monitoring report Indicated in the middle. 5.5 Monitoring readings During monitoring, the distance between the probe (antenna) and the operator's torso is not less than 0.5m, and avoid or minimize the occurrence of peripheral sporadic The interference of his electromagnetic radiation source. Each measuring point is measured at least 5 times in succession, each monitoring time is not less than 15 seconds, and the maximum value in the steady state is read. If monitoring readings When the undulation is large, the monitoring time is appropriately extended. When the monitoring instrument is an automatic measurement system, it should be set to the rms value detection method, each measurement time is not less than 6 minutes, data acquisition The set sampling rate is not less than 1 time/second. 5.6 Record 5.6.1 Recording of mobile communication base station information Record the basic information and other information collected in Section 5.1. 5.6.2 Record of monitoring conditions Record ambient temperature, relative humidity, and weather conditions. Record the date of monitoring, the start and end time of monitoring, the type of monitor, the model and number of the monitoring instrument, and the model and number of the probe (antenna). 5.6.3 Record of monitoring results Record the on-site monitoring point map, marking the location of the mobile communication base station antenna, monitoring points and other known electromagnetic radiation sources. Record the name of the monitoring point, the vertical distance and horizontal distance of the monitoring point and the transmitting antenna of the mobile communication base station, and the monitoring data. The spectrum profile is saved during frequency selective monitoring. See Appendix A for the on-site monitoring records and the contents and format of the monitoring report. 5.7 Data Processing 5.7.1 unit conversion If the unit of the measured electric field strength read by the monitoring instrument is dB (μV/m), it can be converted into V/m according to formula (1). Electric field strength value. ) (6 - E = (1) Where. x -- the reading of the monitoring instrument, dB (μV/m); E -- electric field strength, V/m. The electric field strength and power density can be converted according to formula (2) in the far field. ES = (2) Where. S -- power density, W/m2; E -- electric field strength, V/m; 0Z -- free space intrinsic impedance, Ω = , 1200 πZ . 5.7.2 Data Processing When monitoring with a non-frequency selective broadband electromagnetic radiation monitor, the measurement data is processed according to formula (3). iXn (3) Where. X -- the average value of the measured point power density or electric field strength measurement, W/m2 or V/m; iX - the i-th power density or electric field strength measurement, W/m2 or V/m; n--Number of measurements. When monitoring with a frequency selective broadband electromagnetic radiation monitor, the measurement data is in accordance with equations (4), (5) and (6). Reason. Iji Xn (4) Is SS (5) Is EE 2 (6) Where. ijX -- the jth power density or electric field strength measurement of the frequency i point in a frequency band of the monitoring point, W/m 2 or V/m; iX -- the average value of the measured power density or electric field strength of the frequency i point in a frequency band of the monitoring point, W/m2 or V/m; n--Monitor the power density or electric field strength measurement times of the frequency i point in a certain frequency band; sS -- monitors the power density value of a certain frequency band, W/m2; iS--the power density measurement value of the frequency i point in a certain frequency band of the monitoring point, W/m2; M--the number of measured frequency points in a certain frequency band of the monitoring point; sE -- the electric field strength value of a certain frequency band of the monitoring point, V/m; iE -- The measured value of the electric field strength at the frequency i point in a frequency band of the monitoring point, V/m. For continuous monitoring, the measured data is processed according to formula (7). sG Ek (7) Where. GE - the average value of the electric field strength of a certain frequency band measured within 24h (or within a certain period of time), V/m; The number of measurements in a frequency band is measured within k--24 hours (or within a certain period of time). According to the need, the maximum value maxE and minimum value minE in each monitoring can be separately counted, and the time is not exceeded in 50%, 80% and 95%. Electric field strength values, 50%, E, , 80%, E and, Y, E. The electromagnetic field distribution map can be drawn as needed, such as time and electric field strength, distance and electric field strength, frequency and electric field strength.

6 Quality Assurance

The monitoring organization shall have the capabilities and conditions appropriate to the electromagnetic environment monitoring business it is engaged in. The selection of monitoring points should be representative and should meet the requirements of Section 5.3. Monitoring instruments (including antennas or probes) should be calibrated regularly and used during the validity of their certificate. The instrument should be inspected before and after each monitoring to ensure that the instrument is in normal working condition. The monitoring personnel shall be trained in business, and the on-site monitoring shall be carried out by not less than 2 monitoring personnel. Interference factors should be excluded during monitoring, including human-induced interference factors and environmental interference factors. The selection of abnormal data in monitoring and the data processing of monitoring results should be handled according to statistical principles. Any results of the monitoring or reporting of the monitoring should be reviewed. A complete monitoring file should be established.

Appendix A

(informative appendix) Mobile communication base station electromagnetic radiation environment monitoring record and report format Table A.1 Field Monitoring Record Table (1) Total page Base station basic information Base station name operating unit Construction site latitude and longitude coordinates Network standard type transmission frequency range Antenna height off antenna bracket type Number of antennas running Monitoring condition information Monitoring time year, month and day. ~ . measuring instrument model Weather condition measuring instrument number Ambient temperature ~ °C probe (antenna) model Relative humidity ~ % probe (antenna) number Base station environmental monitoring point map Table A.1 Field Monitoring Record Table (2) Total page Base station name monitoring location Monitoring results Serial number monitoring point name With antenna Distance (m) Monitoring value (unit. ) average value (Unit. ) 1 2 3 4 5 vertical horizontal Surveyor's auditor's date Note. When selecting a frequency measurement, you should record information such as the measurement frequency range. Table A.2 Monitoring report content and format XXXX Environmental Monitoring Agency Monitoring report project name Requester Monitoring category Report date (with special seal for inspection report) XXXX Environmental Monitoring Agency Page total page Monitoring report Word number Monitoring project Requester Trustee address Monitoring category monitoring method Commission date Monitoring date Monitored Environmental conditions Monitoring time. year, month, day, hour, hour, hour Weather. ; Ambient temperature. ~ °C; Relative humidity. ~ % Monitoring location Monitoring basis Technical file Name and code Main instrument used Device name, model Specifications and numbers Main instrument Technical indicators Frequency range, range, calibration certificate, expiration date, etc. Monitoring conclusion Remarks XXXX Environmental Monitoring Agency Page total page Monitoring report Word number XX base station electromagnetic radiation environment monitoring results Point Code Monitoring point description Point and antenna distance (m) electric field strength E(V/m) Power density S(W/m2) vertical level XXXX Environmental Monitoring Agency Page total page Monitoring report Word number XX base station electromagnetic radiation environment monitoring point map The following text blank Report preparer's date of preparation Reviewer review date Issue date of issuer (Special chapter for test report)

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