CN110932804B - Base station average electromagnetic radiation prediction method - Google Patents
Base station average electromagnetic radiation prediction method Download PDFInfo
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- CN110932804B CN110932804B CN201911316301.4A CN201911316301A CN110932804B CN 110932804 B CN110932804 B CN 110932804B CN 201911316301 A CN201911316301 A CN 201911316301A CN 110932804 B CN110932804 B CN 110932804B
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- 230000005670 electromagnetic radiation Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001228 spectrum Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/373—Predicting channel quality or other radio frequency [RF] parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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Abstract
The invention discloses a base station average electromagnetic radiation prediction method, which comprises the steps of calculating the path loss of a base station signal through the height of a base station transmitting antenna, the height of a predicted point and the linear distance from the base station transmitting antenna to the predicted point, combining the maximum transmitting power of the base station and the gain of the base station transmitting antenna to obtain the maximum electromagnetic radiation intensity of the base station at the predicted point, calculating the duty ratio of a base station downlink signal through the downlink flow of the base station and the downlink speed of the base station, and finally combining the maximum electromagnetic radiation intensity of the base station and the duty ratio of the downlink signal of the base station to obtain the average electromagnetic radiation intensity of the base station at the predicted point. The invention can rapidly and accurately predict the average electromagnetic radiation intensity of the base station, has great reference value for researching the electromagnetic radiation exposure condition of the base station, and has certain social benefit.
Description
Technical Field
The invention relates to a base station average electromagnetic radiation prediction method.
Background
With the continuous deepening of the social informatization degree, wireless communication services are explosively increased, and a large number of newly built base stations are put into use, so that potential threats are caused to the environment and public health. At present, the prediction of the average electromagnetic radiation intensity of the base station is mainly calculated by the maximum electromagnetic radiation intensity of the base station and the duty ratio of the base station signal, which are measured by a spectrum analyzer. However, theoretical computational studies of the maximum electromagnetic radiation intensity of the base station and the duty cycle of the base station signal are still under investigation.
Aiming at the defects of the prior art, the invention provides a base station average electromagnetic radiation prediction method. According to the method, the path loss of a base station signal is calculated through the height of a base station transmitting antenna, the height of a predicted point and the linear distance from the base station transmitting antenna to the predicted point, the maximum electromagnetic radiation intensity of the base station at the predicted point is obtained by combining the maximum transmitting power of the base station and the gain of the base station transmitting antenna, the duty ratio of a base station downlink signal is calculated through the downlink flow of the base station and the downlink speed of the base station, and finally the average electromagnetic radiation intensity of the base station at the predicted point is obtained by combining the maximum electromagnetic radiation intensity of the base station and the duty ratio of the base station downlink signal. Experiments show that the method provided by the invention can accurately predict the average electromagnetic radiation intensity of the base station.
Disclosure of Invention
In order to solve the technical problems, the invention provides a base station average electromagnetic radiation prediction method, which comprises the following steps:
1) Calculating the path loss of the base station signal according to the height of the base station transmitting antenna, the height of the predicted point and the linear distance from the base station transmitting antenna to the predicted point;
2) Calculating the maximum electromagnetic radiation intensity of the base station at the predicted point according to the maximum transmitting power of the base station, the transmitting antenna gain of the base station and the path loss of the base station signal obtained in the step 1);
3) Counting the downlink flow of the base station in a certain time, and calculating the duty ratio of a downlink signal of the base station by combining the downlink rate of the base station;
4) And (3) calculating the average electromagnetic radiation intensity of the base station at the predicted point according to the maximum electromagnetic radiation intensity of the base station at the predicted point obtained in the step (2) and the duty ratio of the downlink signal of the base station obtained in the step (3).
In the above method for predicting average electromagnetic radiation of a base station, in the step 1), path loss of a base station signal is:
L＝-20 log 10 h t h r +40 log 10 d
in the above formula, L represents the path loss of the base station signal, and the unit is dB, h t Representing the height of the transmitting antenna of the base station, wherein the unit is m and h r The height of the predicted point is expressed in m, d is the linear distance from the base station transmitting antenna to the predicted point, and m is the unit.
In the above method for predicting average electromagnetic radiation of a base station, in the step 2), the maximum electromagnetic radiation intensity of the base station at the predicted point is:
in the above, E max Representing the maximum electromagnetic radiation intensity of the base station at the predicted point, wherein the unit is V/m and P t The maximum transmitting power of the base station is represented by W, G represents the gain of the transmitting antenna of the base station, dB, L represents the path loss of the base station signal, dB, and d represents the linear distance from the transmitting antenna of the base station to the predicted point, and m.
In the above method for predicting average electromagnetic radiation of a base station, in the step 3), a duty ratio of a downlink signal of the base station is:
in the above formula, D represents the duty ratio of the base station downlink signal, F represents the base station downlink flow within t seconds, t represents the statistical duration of the base station downlink flow, s represents the base station downlink rate, and b/s represents the unit.
In the above method for predicting average electromagnetic radiation of a base station, in the step 4), the average electromagnetic radiation intensity of the base station at the predicted point is:
in the above, E avg Representing the average electromagnetic radiation intensity of the base station at the predicted point, the unit is V/m and E max The maximum electromagnetic radiation intensity of the base station at the predicted point is represented by V/m, and D represents the duty ratio of the downlink signal of the base station.
The invention has the beneficial effects that: calculating the path loss of a base station signal through the height of a base station transmitting antenna, the height of a predicted point and the linear distance from the base station transmitting antenna to the predicted point, combining the maximum transmitting power of the base station and the gain of the base station transmitting antenna to obtain the maximum electromagnetic radiation intensity of the base station at the predicted point, calculating the duty ratio of a base station downlink signal through the downlink flow of the base station and the downlink speed of the base station, and finally combining the maximum electromagnetic radiation intensity of the base station and the duty ratio of the base station downlink signal to obtain the average electromagnetic radiation intensity of the base station at the predicted point. The method can rapidly and accurately predict the average electromagnetic radiation intensity of the base station, has a large reference value for researching the electromagnetic radiation exposure condition of the base station, and has certain social benefit.
Detailed Description
The invention will be described in further detail with reference to specific embodiments. The present embodiment is performed on the premise of the present disclosure, and detailed implementation steps are given, but the scope of the present disclosure is not limited to the following embodiments.
The embodiment predicts the electromagnetic radiation intensity of a TD-LTE base station near an experimental building in a university campus, and the maximum transmitting power P of the base station t Base station antenna gain g=20 dB, experimental measurement equipment is portable spectrum analyzer Keysight FieldFox N9918A and periodic log antenna hyperslog 60180.
The invention provides a base station average electromagnetic radiation prediction method, which comprises the following steps:
1) Calculating the path loss of the base station signal according to the height of the base station transmitting antenna, the height of the predicted point and the linear distance from the base station transmitting antenna to the predicted point;
2) Calculating the maximum electromagnetic radiation intensity of the base station at the predicted point according to the maximum transmitting power of the base station, the transmitting antenna gain of the base station and the path loss of the base station signal obtained in the step 1);
3) Counting the downlink flow of the base station in a certain time, and calculating the duty ratio of a downlink signal of the base station by combining the downlink rate of the base station;
4) And (3) calculating the average electromagnetic radiation intensity of the base station at the predicted point according to the maximum electromagnetic radiation intensity of the base station at the predicted point obtained in the step (2) and the duty ratio of the downlink signal of the base station obtained in the step (3).
In the step 1), the height h of the transmitting antenna of the base station t Height h of predicted point =31m r The linear distance d=117 m of the base station transmitting antenna to the predicted point=13.5m, so the path loss of the base station signal is:
L＝-20 log 10 h t h r +40 log 10 d
＝-20 log 10 (31·13.5)+40 log 10 117
≈30.29dB
in the step 2), the maximum transmitting power P of the base station t Base station transmit antenna gain g=20 dB, base station transmit antenna to predicted point straight line distance d=117 m, therefore base station maximum electromagnetic radiation intensity at predicted point is:
in the step 3), the statistical duration t=1800s of the downlink traffic of the base station, and the downlink traffic f=2.364·10 of the base station within 1800 seconds 10 Byte, base station downlink rate r=6.25·10 6 Byte/s, the duty cycle of the base station downlink signal is therefore:
in the step 4), the average electromagnetic radiation intensity of the base station at the predicted point is:
in the embodiment, the spectrum analyzer is used for measuring the electromagnetic radiation intensity of the TD-LTE base station near the experimental building in the university campus, the measured value is 0.0466V/m, and the measured value is basically consistent with the predicted value of the method used by the invention, so that the method can accurately and rapidly predict the average electromagnetic radiation intensity of the base station, and the effectiveness of the method used by the invention is verified.
Claims (2)
1. A method for predicting average electromagnetic radiation of a base station, comprising the steps of:
1) Calculating the path loss of the base station signal according to the height of the base station transmitting antenna, the height of the predicted point and the linear distance from the base station transmitting antenna to the predicted point:
L＝-20log 10 h t h r +40log 10 d
in the above formula, L represents the path loss of the base station signal, and the unit is dB, h t Representing the height of the transmitting antenna of the base station, wherein the unit is m and h r The height of the predicted point is expressed in m, d represents the linear distance from the transmitting antenna of the base station to the predicted point, and m is the unit;
2) Calculating the maximum electromagnetic radiation intensity of the base station at the predicted point according to the maximum transmitting power of the base station, the transmitting antenna gain of the base station and the path loss of the base station signal obtained in the step 1):
in the above, E max Representing the maximum electromagnetic radiation intensity of the base station at the predicted point, wherein the unit is V/m and P t The maximum transmitting power of the base station is represented by W, G represents the gain of a transmitting antenna of the base station, dB, L represents the path loss of a base station signal, dB, d represents the linear distance from the transmitting antenna of the base station to a predicted point, and m represents the linear distance from the transmitting antenna of the base station to the predicted point;
3) Counting the downlink flow of the base station in a certain time, and calculating the duty ratio of a downlink signal of the base station by combining the downlink rate of the base station:
in the above formula, D represents the duty ratio of a base station downlink signal, F represents the base station downlink flow within t seconds, t represents the statistical duration of the base station downlink flow, s represents the base station downlink rate, and Byte/s represents the statistical duration of the base station downlink flow;
4) And (3) calculating the average electromagnetic radiation intensity of the base station at the predicted point according to the maximum electromagnetic radiation intensity of the base station at the predicted point obtained in the step (2) and the duty ratio of the downlink signal of the base station obtained in the step (3).
2. The method for predicting average electromagnetic radiation of a base station according to claim 1, wherein in the step 4), the average electromagnetic radiation intensity of the base station at the predicted point is:
in the above, E avg Representing base station average electromagnetic at predicted pointsRadiation intensity, in V/m, E max The maximum electromagnetic radiation intensity of the base station at the predicted point is represented by V/m, and D represents the duty ratio of the downlink signal of the base station.
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| CN108282239A (en) * | 2018-01-25 | 2018-07-13 | 湘潭大学 | A kind of average electromagnetic radiation prediction technique of WLAN |
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