CN111030761B - Electromagnetic radiation prediction method for mountain base station - Google Patents
Electromagnetic radiation prediction method for mountain base station Download PDFInfo
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- CN111030761B CN111030761B CN201911344381.4A CN201911344381A CN111030761B CN 111030761 B CN111030761 B CN 111030761B CN 201911344381 A CN201911344381 A CN 201911344381A CN 111030761 B CN111030761 B CN 111030761B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3913—Predictive models, e.g. based on neural network models
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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Abstract
The invention discloses a method for predicting electromagnetic radiation of a mountain area base station, which comprises the steps of firstly providing a base station radiation signal, obtaining power k (h) attenuated when the base station radiation signal passes through a mountain peak obstacle propagation model with the height of h, then counting the number of the mountain peaks between the base station and a point to be measured, calculating to obtain total attenuated power P (h), and finally predicting to obtain a base station electromagnetic radiation value of the point to be measured, wherein the distance from the base station to the point to be measured is r by combining a base station electromagnetic radiation intensity calculation formula S. According to the method, the radiation attenuation power of the mountain base station is calculated according to the height of the mountain peak in the mountain area, and the electromagnetic radiation intensity of the mountain base station can be accurately predicted.
Description
Technical Field
The invention relates to a method for predicting electromagnetic radiation of a mountainous area base station.
Background
The mobile communication technology is rapidly developed, a fifth generation communication system also immediately enters the visual field of people in 2019, more and more base stations are to be built, the base stations in mountainous areas are very much built along with higher and higher coverage requirements, and mountains have certain influence on the propagation energy of electromagnetic radiation of the base stations.
Aiming at the defects in the prior art, the method provides a method for predicting the electromagnetic radiation of a mountain area base station, firstly, a base station radiation signal is provided to pass through a mountain peak obstacle propagation model to obtain the power k (h) attenuated when passing through a mountain peak with the height h, then, the number of the mountain peaks between the base station and a point to be measured is counted, the total attenuation power P (h) is calculated, then, a formula S is calculated by combining the electromagnetic radiation intensity of the base station, and finally, the electromagnetic radiation value of the base station of the point to be measured, which is r away from the base station, is predicted and obtained.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for predicting electromagnetic radiation of a mountain base station.
The technical scheme for solving the technical problems comprises the following steps:
(1) establishing a base station radiation signal propagation model through a mountain peak obstacle:
wherein k (h) is the attenuation power when the base station radiates through a peak with height h, the unit is W, h is the peak height, the unit is m, e is a natural constant, and the value is 2.178;
(2) according to the power k (h) attenuated after the base station radiation passes through the peak with the height h obtained in the step (1), counting the number of the peaks between the base station and the point to be measured to obtain a total attenuation power expression P (h);
(3) and (4) obtaining total attenuation power P (h) according to the step (2), and obtaining the electromagnetic radiation intensity S of the base station to be measured by combining a far-field power density expression.
In the step (2), the power expression of the total attenuation is calculated by combining the base station radiation signal obtained in the step (1) through a mountain obstacle propagation model k (h) as follows:
where P (h) is the power of the total attenuation in W, where n1The number of peaks with the height between the base station and the point to be measured being 40 meters, and hmIs at n1The height of the mth mountain peak is m; n is2The number of peaks with the height between the base station and the point to be measured being higher than or equal to 40 meters, and hiIs at n2The height of the ith peak in m.
In the step (3), by combining the total attenuation power expression p (h) obtained in the step (2), a power density expression with a distance r between the point to be measured and the base station is as follows:
wherein S is the total radiation intensity value of the base station to the point to be measured, and the unit is W/m2R is the distance between the point to be measured and the base station, and the unit is m, G is the antenna gain of the base station, and the unit is dB, and P is the transmitting power of the base station, and the unit is W.
The invention has the beneficial effects that: the method comprises the steps of firstly providing a base station radiation signal, obtaining power k (h) attenuated when the base station radiation signal passes through a peak with the height h through a peak obstacle propagation model, then counting the number of peaks between a base station and a point to be measured, calculating to obtain total attenuated power P (h), and finally predicting to obtain a base station electromagnetic radiation value of the point to be measured, wherein the distance from the base station to the point to be measured is r by combining with a base station electromagnetic radiation intensity calculation formula S. According to the method, the radiation attenuation power of the mountain base station is calculated according to the height of the mountain peak in the mountain area, and the electromagnetic radiation intensity of the mountain base station can be accurately predicted.
Detailed Description
The implementation object of the invention is a base station of FDD-LTE, and the working frequency is as follows: 1980MHz, the test site was a mountainous area around the school, the measuring equipment used a portable spectrum analyzer (KEYSIGHT N9918A, measuring maximum frequency 26.5GHz) and a log periodic antenna (HyperLOG 60180, measuring frequency range 680 MHz-18 GHz), the antenna factor AF was 30dB/m, and the cable loss was 3 dB.
The invention discloses a method for predicting electromagnetic radiation of a mountainous area base station, which comprises the following steps:
(1) establishing a base station radiation signal propagation model through a mountain peak obstacle:
wherein k (h) is the attenuation power when the base station radiates through a peak with height h, the unit is W, h is the peak height, the unit is m, e is a natural constant, and the value is 2.178;
(2) according to the power k (h) of the attenuation of the base station radiation after the peak height h is obtained in the step (1), counting the number of the peaks between the base station and the point to be measured to obtain a total attenuation power expression P (h);
(3) and (3) obtaining the electromagnetic radiation intensity S of the base station to be measured according to the total attenuation power P (h) obtained in the step (2) and a far-field power density expression.
In the step (2), the number of buildings less than or equal to 40m is obtained according to the height and the number of the peaks between the mountain area base station and the point to be measuredQuantity n1Number of buildings n of 1, height 33m, above 40m2And 2, the heights are 57m and 69m respectively, the power expression P (h) of the total attenuation is calculated according to the propagation model k (h) of the base station radiation passing peak obstacles obtained in the step 1, and the power expression P (h) is as follows:
in the step (3), a power expression p (h) of the total attenuation is calculated according to the step (2), where the antenna gain G of the base station of the FDD-LTE is 13dB 20, the transmission power of the base station is 15W, and the power density expression where the distance between the point to be measured and the base station is 45m is as follows:
the predicted power density s obtained from the above predicted point is 0.015W/m2To demonstrate the effectiveness of the invention, we obtained a measurement of 0.013W/m after field measurements with a spectrometer at a location 45m from the base station2,;
Through comparison, the predicted value of the electromagnetic radiation intensity of the mountainous area base station is very consistent with the actual measured value, and the validity of the content of the invention is verified.
Claims (1)
1. A method for predicting electromagnetic radiation of a mountain base station is characterized by comprising the following steps:
(1) establishing a base station radiation signal propagation model through a mountain peak obstacle:
wherein k (h) is the attenuation power when the base station radiates through a peak with height h, the unit is W, h is the peak height, the unit is m, e is a natural constant, and the value is 2.178;
(2) according to the power k (h) of attenuation after the base station radiates through a peak with the height h, which is obtained in the step (1), the number of peaks between the base station and a point to be measured is counted to obtain a total attenuation power expression P (h):
where P (h) is the power of the total attenuation in W, where n1The number of peaks with the height between the base station and the point to be measured being less than 40 meters, and hmIs at n1The height of the mth mountain peak is m; n is2The number of peaks with the height between the base station and the point to be measured being higher than or equal to 40 meters, and hiIs at n2The height of the ith peak is m;
(3) and (3) according to the total attenuated power P (h) obtained in the step (2), combining a far-field power density expression to obtain the electromagnetic radiation intensity S of the base station to be measured:
wherein S is the total radiation intensity value of the base station to the point to be measured, and the unit is W/m2R is the distance between the point to be measured and the base station, and the unit is m, G is the antenna gain of the base station, and the unit is dB, and P is the transmitting power of the base station, and the unit is W.
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