CN108254628B - Base station electromagnetic radiation intensity evaluation method - Google Patents
Base station electromagnetic radiation intensity evaluation method Download PDFInfo
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- CN108254628B CN108254628B CN201810104476.8A CN201810104476A CN108254628B CN 108254628 B CN108254628 B CN 108254628B CN 201810104476 A CN201810104476 A CN 201810104476A CN 108254628 B CN108254628 B CN 108254628B
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- 230000005670 electromagnetic radiation Effects 0.000 title claims abstract description 81
- 238000011156 evaluation Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 5
- 239000011541 reaction mixture Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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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
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0857—Dosimetry, i.e. measuring the time integral of radiation intensity; Level warning devices for personal safety use
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- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a base station electromagnetic radiation intensity evaluation method, which is characterized in that a base station electromagnetic radiation intensity probability density estimation function model is established according to the strong randomness of the electromagnetic radiation change of a base station, and parameters of the base station electromagnetic radiation intensity probability density estimation function are calculated according to the measured value of the electromagnetic radiation intensity of the base station, so that the base station electromagnetic radiation intensity evaluation method is suitable for evaluation of the electromagnetic radiation intensity of any base station. The invention establishes a probability density estimation function of the electromagnetic radiation intensity of the base station based on the random characteristic of the electromagnetic radiation change of the base station, and provides a quick and effective evaluation method of the electromagnetic radiation of the base station.
Description
Technical Field
The invention relates to a method for evaluating electromagnetic radiation intensity of a base station.
Background
With the long-term development of mobile communication technology and the advancement of personal mobile intelligent devices, this makes mobile communication base stations become the most important electromagnetic radiation source in life, and has attracted extensive attention from the public and researchers. However, when measuring the electromagnetic radiation of the base station, the measured electromagnetic radiation level of the base station is constantly changing, and presents a certain randomness, so that it is difficult to effectively evaluate the electromagnetic radiation level of the base station, and in the currently published documents and patents, there is no method capable of effectively evaluating the electromagnetic radiation level of the base station based on the random characteristic (i.e. the probability density function of the electromagnetic radiation intensity) of the electromagnetic radiation change of the base station, so that a new technology is needed to solve the problem.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a method for evaluating electromagnetic radiation intensity of a base station.
The technical scheme for solving the technical problems comprises the following steps:
1) measuring the electromagnetic radiation intensity of the base station by using a spectrum analyzer, and recording n measured values of the electromagnetic radiation intensity of the base station as { A }i,i＝1,…,n}；
2) Establishing a probability density estimation function of the electromagnetic radiation intensity of the base station with parameters of alpha, beta, sigma and mu, and calculating as follows:
in the formula (1), P (A)i) Strong electromagnetic radiation for base stationProbability density function of degree, AiIs a measurement value of the electromagnetic radiation intensity of the base station and has the unit of mu w/cm2α, σ and μ are parameters;
parameters α, sigma and mu in the probability density estimation function of the electromagnetic radiation intensity of the base station are obtained by substituting the measured value { A ] of the electromagnetic radiation intensityiI ═ 1, …, n } is calculated as follows:
3) combining the measured electromagnetic radiation intensity values of the base station { A }iI-1, …, n and probability density estimation function P (A) of electromagnetic radiation intensity of base stationi) And calculating the electromagnetic radiation intensity evaluation value of the base station.
In the above method for predicting the average electromagnetic radiation of the TD-LTE base station, in step 3), the measured value { a } of the electromagnetic radiation intensity of the base station is combinediI-1, …, n and probability density estimation function P (A) of electromagnetic radiation intensity of base stationi) Evaluation of electromagnetic radiation intensity of base station
The calculation is as follows:
in the formula (3), the reaction mixture is,
the unit is an electromagnetic radiation intensity evaluation value of the base station and is mu w/cm2，P(Ai) For the probability density estimation function of the electromagnetic radiation intensity of the base station, AiIs a measurement value of the electromagnetic radiation intensity of the base station and has the unit of mu w/cm2。
The invention has the beneficial effects that: the method considers the randomness of the electromagnetic radiation intensity change of the base station, establishes the probability density estimation function of the electromagnetic radiation intensity of the base station to evaluate the electromagnetic radiation intensity of the base station, and provides a quick and effective evaluation method of the electromagnetic radiation intensity of the base station. The method has great reference value for base station construction and environmental protection, and has certain social benefit.
Detailed Description
The present invention will be further described with reference to the following examples.
The implementation object of the invention is a base station A with a downlink transmission band of 1840 MHz-1860 MHz, the measuring equipment adopts a portable spectrum analyzer (KEYSIGHT N9918A, measuring maximum frequency of 26.5GHz) and a log-periodic antenna (HyperLOG60180, measuring frequency range of 680 MHz-18 GHz), the antenna factor AF of the receiving antenna on the frequency of 1.8GHz is 30dB/m, and the cable loss is 3 dB.
The invention discloses a method for evaluating the electromagnetic radiation intensity of a base station, which comprises the following steps:
1) measuring the electromagnetic radiation intensity of the base station by using a spectrum analyzer, and recording n measured values of the electromagnetic radiation intensity of the base station as { A }i，i＝1，…，n}；
2) Establishing a base station electromagnetic radiation intensity probability density estimation function with parameters of alpha, beta, sigma and mu, wherein the parameters of alpha, beta, sigma and mu in the base station electromagnetic radiation intensity probability density estimation function are calculated by formula (2) shown in formula (1);
3) combining the measured electromagnetic radiation intensity values of the base station { A }iI-1, …, n and probability density estimation function P (A) of electromagnetic radiation intensity of base stationi) And calculating the electromagnetic radiation intensity evaluation value of the base station.
In the step 1), the electromagnetic radiation intensity of the base station is measured by using a spectrum analyzer, and 1000 measured values of the electromagnetic radiation intensity of the base station are recorded as { A }in the embodiment1＝0.017，A2＝0.075，A3＝0.048，Ai-1＝0.065，Ai＝0.097，Ai+1＝0.031，…，A10000.065, in μ w/cm2。
In the step 2), the measured value { A) of the electromagnetic radiation intensity of the base station obtained in the step 1) is combinediI 1, …, 1000, calculating parameters α, σ and μ in the probability density estimation function of the electromagnetic radiation intensity of the base station, as follows according to equation (2):
the value of α obtained by equation group solution was 0.523 × 10-3β has a value of 1.006 and σ has a value of 0.796 × 10-3And μ is 0.049. substituting parameters α, σ, and μ into the base station electromagnetic radiation intensity probability density estimation function, the following is calculated according to equation (1):
in the step 3), the measured value { A ] of the electromagnetic radiation intensity of the base station is combinediI-1, …, n and probability density estimation function P (A) of electromagnetic radiation intensity of base stationi) Evaluation of electromagnetic radiation intensity of base station according to the formula (3)
The calculation is as follows:
the base station electromagnetic radiation intensity evaluation value obtained by the patent
The results are shown in table 1, compared to the average electromagnetic radiation intensity measurements of the base station:
TABLE 1 comparison of the electromagnetic radiation intensity evaluation value and the measured value of the base station
| Evaluation value (μ w/cm)2) | Measured value (. mu.w/cm)2) |
| 0.051 | 0.057 |
Through comparison, the evaluation result and the measurement result of the electromagnetic radiation intensity of the base station are basically consistent, the validity of the content of the invention is verified, and the method provided by the patent can quickly and effectively evaluate the electromagnetic radiation intensity with strong randomness of the base station.
Claims (2)
1. A method for evaluating the electromagnetic radiation intensity of a base station is characterized by comprising the following steps:
1) measuring the electromagnetic radiation intensity of the base station by using a spectrum analyzer, and recording n measured values of the electromagnetic radiation intensity of the base station as { A }i,i＝1,…,n}；
2) Establishing a probability density estimation function of the electromagnetic radiation intensity of the base station with parameters of alpha, beta, sigma and mu, and calculating as follows:
in the formula (1), P (A)i) Is a probability density function of the electromagnetic radiation intensity of the base station, AiIs a measurement value of the electromagnetic radiation intensity of the base station and has the unit of mu w/cm2α, σ and μ are parameters;
parameters α, sigma and mu in the probability density estimation function of the electromagnetic radiation intensity of the base station are obtained by substituting the measured value { A ] of the electromagnetic radiation intensityiI ═ 1, …, n } is calculated as follows:
3) combining the measured electromagnetic radiation intensity values of the base station { A }iI-1, …, n and probability density estimation function P (A) of electromagnetic radiation intensity of base stationi) And calculating the electromagnetic radiation intensity evaluation value of the base station.
2. A base station as claimed in claim 1The method for evaluating the intensity of the electromagnetic radiation, in the step 3), is characterized by combining the measured value { A) of the intensity of the electromagnetic radiation of the base stationiI-1, …, n and probability density estimation function P (A) of electromagnetic radiation intensity of base stationi) Evaluation of electromagnetic radiation intensity of base station
The calculation is as follows:
in the formula (3), the reaction mixture is,
the unit is an electromagnetic radiation intensity evaluation value of the base station and is mu w/cm2，P(Ai) For the probability density estimation function of the electromagnetic radiation intensity of the base station, AiIs a measurement value of the electromagnetic radiation intensity of the base station and has the unit of mu w/cm2α, σ and μ are parameters.
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| CN109581075B (en) * | 2018-12-11 | 2021-04-23 | 湘潭大学 | Base station electromagnetic radiation evaluation method with buildings on two sides |
| CN109342831B (en) * | 2018-12-11 | 2021-02-09 | 湘潭大学 | Base station electromagnetic radiation measuring method with houses on four sides |
| CN109459640B (en) * | 2018-12-12 | 2021-02-09 | 湘潭大学 | Scenic spot area base station electromagnetic radiation prediction method |
| CN111273092A (en) * | 2020-01-16 | 2020-06-12 | 湘潭大学 | University campus area base station average electromagnetic radiation prediction method |
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