CN104237651B - Antenna of mobile communication base station radiosity computational methods - Google Patents
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Abstract
The invention discloses a kind of antenna of mobile communication base station radiosity computational methods, step includes：Set up level, vertical plane normalizes directivity function, for the measuring point on day line options distance to a declared goal vertical plane, the fitting coefficient that the antenna horizontal plane normalizes directivity function is obtained by obtaining the antenna radiated power data of measuring point and being fitted, antenna theory yield value based on mobile communication base station determines that the antenna of mobile communication base station reaches the final gain value of aerial panel, and then combine the fitting coefficient that antenna horizontal plane normalizes directivity function, the final gain value of antenna arrival aerial panel is set up the computation model of antenna for base station electromagnetic radiance density and is calculated and is applicable to any azimuthal antenna radiated power density.The present invention have accuracy it is high, suitable for any azimuthal advantage.
Description
Technical field
The invention belongs to field of environment engineering technology, and in particular to a kind of antenna of mobile communication base station radiosity meter
Calculation method, it is adaptable to which the Accurate Prediction and environmental quality of mobile communication base station antenna radiated power density are commented under any azimuth
Valency.
Background technology
Recently as the fast development of Communication in China technology, engineering construction speed in mobile communication base station is accelerated, mobile logical
Believe that the electromagnetic radiation environment influence of base station also increasingly causes social extensive concern.Power density is to evaluate antenna for base station electromagnetic radiation
The Main Factors of level, Accurate Prediction antenna for base station electromagnetic radiance density can provide guidance for base station construction, to avoid base
Station antenna electromagnetic radiation is exceeded.But, currently for the prediction of antenna for base station electromagnetic radiation,《Radiation environment conservative management directive/guide
Electromagnetic radiation monitoring instrument and method》(HJ/T 10.2-1996) only gives axial power density computational methods, it is impossible to realize
The prediction of antenna for base station other direction electromagnetic radiance density.
The content of the invention
The technical problem to be solved in the present invention is：For the above-mentioned technical problem of prior art, there is provided a kind of accuracy is high,
Suitable for any azimuthal antenna of mobile communication base station radiosity computational methods.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of antenna of mobile communication base station radiosity computational methods, implementation step is as follows：
1) antenna for mobile communication base station sets up the normalization of the antennas orthogonal face shown in formula (1) directivity function and formula
(2) the horizontal plane normalization directivity function shown in；
In formula (1) and formula (2), F (θ) represents antennas orthogonal face normalization directivity function, and n represents bay number, k tables
Show the wave number of antenna for base station, d represents bay spacing, and θ represents antenna main lobe axially and horizontal coordinate face angle；Table
Show that antenna horizontal plane normalizes directivity function, M represents that antenna horizontal plane normalizes the fitting coefficient of directivity function,Represent antenna
Main lobe axial direction and horizontal axis forward direction angle；
2) for the measuring point on day line options distance to a declared goal vertical plane, by the antenna radiated power data that obtain measuring point simultaneously
It is fitted for formula (1) and formula (2) and obtains the fitting coefficient M that the antenna horizontal plane normalizes directivity function；
3) the antenna theory yield value based on mobile communication base station, with reference to loss, 7/ of 1/2 wire jumper of mobile communication base station
The loss of 8 feeder lines, the loss of jointing, the loss of arrester determine that the antenna of mobile communication base station reaches aerial panel most
Whole yield value G；
4) the antenna radiated power Forecasting Model of Density shown in formula (3) is set up；By the antenna water of the mobile communication base station
The fitting coefficient M of plane normalization directivity function, antenna reach the day shown in final gain value G substitutions formula (3) of aerial panel
Beta radiation power density forecast model, is calculated the antenna radiated power density of future position；
In formula (3), S represents the antenna radiated power density of future position, and P represents the antenna transmitting work(of mobile communication base station
Rate, G represent antenna reach aerial panel final gain value, r represent future position between the antenna of mobile communication base station away from
From θ represents antenna main lobe axially and horizontal coordinate face angle, and δ represents the Downtilt of mobile communication base station, ψ0.5Represent and move
The antennas orthogonal face half-power angle of dynamic communication base station, M represents that antenna horizontal plane normalizes the fitting coefficient of directivity function,Represent
The antenna main lobe axial direction of mobile communication base station and horizontal axis forward direction angle.
Preferably, the step 2) detailed step it is as follows：
2.1) obtain in the antenna main lobe horizontal plane specified angle interval direction of mobile communication base station, apart from antenna it is specified away from
The vertical plane for putting place off normal to detect path；
2.2) highly for starting point, interval sets downwards where the center of antenna on the detection path from mobile communication base station
Predetermined number measuring point is put, the antenna of each measuring point is tested respectively by radiating frequency selector under the working condition of mobile communication base station
Radiant power data；
2.3) with antenna main lobe axial direction, the electromagnetic radiance at antenna distance to a declared goal position of mobile communication base station
Density as normalization reference value, by step 2.2) in the antenna radiated power data of each measuring point that obtain and institute
State normalization reference value to be divided by and be normalized, and be fitted for formula (1) and formula (2), obtain so that fitting result is best
Antenna horizontal plane normalize directivity function fitting coefficient M.
Preferably, the step 2.1) in mobile communication base station antenna main lobe horizontal plane specified angle interval direction it is specific
Refer to -30 °~+30 ° directions in interval of antenna main lobe horizontal plane of mobile communication base station.
Preferably, the step 2.1) in be specially 5 meters apart from antenna distance to a declared goal position.
Preferably, the step 2.2) in height where center of antenna on the detection path from mobile communication base station
During interval setting predetermined number measuring point downward for starting point the spacing distance of adjacent measuring point be 1 meter, and the measuring point total quantity
It is 5.
Preferably, the step 3) detailed step it is as follows：
3.1) the antenna theory yield value G1 of mobile communication base station is obtained；
3.2) the length L1 of 1/2 wire jumper of antenna of mobile communication base station, the length L2 of 7/8 feeder line, jointing are obtained
Quantity n, and the final gain value of aerial panel is reached according to the antenna that formula (4) calculates mobile communication base station；
G=10(G1-(a×L1+b×L2+c×n+d))/10 (4)
In formula (4), G represents that the antenna of mobile communication base station reaches the final gain value of aerial panel, and G1 represents mobile logical
Believe the antenna theory yield value of base station, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, and L2 represents mobile communication base
The length of 7/8 feeder line of station antenna, n represents the quantity of the jointing of antenna of mobile communication base station, and a represents mobile communication base station
Every meter of loss of 1/2 wire jumper of antenna, b represents every meter of loss of 7/8 wire jumper of antenna of mobile communication base station, and c represents mobile logical
Believe the jointing loss of antenna for base station, d represents the arrester loss of antenna of mobile communication base station.
Antenna of mobile communication base station radiosity computational methods tool of the present invention has the advantage that：Mobile communication of the present invention
Base station antenna radiation power density computation method sets up antenna horizontal plane normalization direction letter for the antenna of mobile communication base station
Number, vertical plane normalization directivity function, carry out test fitting and obtain antenna water by the antenna radiated power data for detecting measuring point
Plane normalizes the fitting coefficient of directivity function, the degree of accuracy of calculating is improve, while the day lineation based on mobile communication base station
By yield value, loss, the loss of 7/8 feeder line with reference to 1/2 wire jumper of mobile communication base station, the loss of jointing, arrester
Loss determine mobile communication base station antenna reach aerial panel final gain value, give accurate antenna final gain
Value, the more accurate reliable base of both fitting coefficient, final gain value of aerial panel of directivity function is normalized in horizontal plane
On plinth, the antenna radiated power density prediction that directivity function is set up is normalized by the level based on antenna for base station, vertical plane
Model, the foundation of the forecast model is while the both horizontally and vertically function for considering antenna for base station is finally obtained and can accurately calculated
The electromagnetic radiance density computational methods in different orientations antenna for base station far field, can quickly be calculated the antenna of future position
Radiosity such that it is able to the electromagnetic radiance density in antenna for base station different orientations far field is more accurately predicted,
With accuracy it is high, suitable for any azimuthal advantage, can be widely applied to the electromagnetism spoke of all kinds of antenna of mobile communication base station
Penetrate prediction and environmental quality assessment.
Brief description of the drawings
Fig. 1 is the basic skills schematic flow sheet of the embodiment of the present invention.
Specific embodiment
Below by taking the GSM900 antennas of mobile communication base station as an example, the angle of declination of the antenna is 5 °, below in conjunction with accompanying drawing
The present invention is further detailed explanation with embodiment, but the embodiment should not be construed as limiting the invention.
As shown in figure 1, the implementation steps of the present embodiment antenna of mobile communication base station radiosity computational methods are as follows：
1) antenna for mobile communication base station sets up the normalization of the antennas orthogonal face shown in formula (1) directivity function and formula
(2) the horizontal plane normalization directivity function shown in；
In formula (1) and formula (2), F (θ) represents antennas orthogonal face normalization directivity function, and n represents bay number, k tables
Show the wave number of antenna for base station, d represents bay spacing, and θ represents antenna main lobe axially and horizontal coordinate face angle；Table
Show that antenna horizontal plane normalizes directivity function, M represents that antenna horizontal plane normalizes the fitting coefficient of directivity function,Represent antenna
Main lobe axial direction and horizontal axis forward direction angle；
2) for the measuring point on day line options distance to a declared goal vertical plane, by the antenna radiated power data that obtain measuring point simultaneously
It is fitted for formula (1) and formula (2) and obtains the fitting coefficient M that antenna horizontal plane normalizes directivity function；
3) the antenna theory yield value based on mobile communication base station, with reference to loss, 7/ of 1/2 wire jumper of mobile communication base station
The loss of 8 feeder lines, the loss of jointing, the loss of arrester determine that the antenna of mobile communication base station reaches aerial panel most
Whole yield value G；
4) the antenna radiated power Forecasting Model of Density shown in formula (3) is set up；By the antenna horizontal plane of mobile communication base station
Normalize the antenna spoke shown in fitting coefficient M, final gain value G substitutions formula (3) of antenna arrival aerial panel of directivity function
Power density forecast model is penetrated, the antenna radiated power density of future position is calculated；
In formula (3), S represents the antenna radiated power density of future position, and P represents the antenna transmitting work(of mobile communication base station
Rate, G represent antenna reach aerial panel final gain value, r represent future position between the antenna of mobile communication base station away from
From θ represents antenna main lobe axially and horizontal coordinate face angle, and δ represents the Downtilt of mobile communication base station, ψ0.5Represent and move
The antennas orthogonal face half-power angle of dynamic communication base station, M represents that antenna horizontal plane normalizes the fitting coefficient of directivity function,Represent
The antenna main lobe axial direction of mobile communication base station and horizontal axis forward direction angle.
In the present embodiment, step 2) detailed step it is as follows：
2.1) obtain in the antenna main lobe horizontal plane specified angle interval direction of mobile communication base station, apart from antenna it is specified away from
The vertical plane for putting place off normal to detect path；In the present embodiment, step 2.1) in mobile communication base station antenna main lobe horizontal plane
Specified angle interval direction specifically refers to -30 °~+30 ° directions in interval of antenna main lobe horizontal plane of mobile communication base station；Distance
Antenna distance to a declared goal position is specially 5 meters.
2.2) highly for the downward interval setting of starting point is pre- where the center of antenna on detection path from mobile communication base station
If quantity measuring point, the aerial radiation of each measuring point is tested respectively by radiating frequency selector under the working condition of mobile communication base station
Power data；In the present embodiment, step 2.2) in be highly where center of antenna on detection path from mobile communication base station
The spacing distance of adjacent measuring point is 1 meter during starting point downward interval setting predetermined number measuring point, and the total quantity of measuring point is 5.
2.3) with antenna main lobe axial direction, the electromagnetic radiance at antenna distance to a declared goal position of mobile communication base station
Density as normalization reference value, by step 2.2) in the antenna radiated power data of each measuring point that obtain referred to normalization
Value is divided by and is normalized, and is fitted for formula (1) and formula (2), obtains the antenna horizontal plane for causing that fitting result is best
Normalize the fitting coefficient M of directivity function.Antenna horizontal plane normalizes the fitting coefficient M round numbers of directivity function in the present embodiment
Value, during by being fitted after experimental test data normalization, when the fitting coefficient M of antenna horizontal plane normalization directivity function takes 9
When fitting result it is best.
Preferably, step 3) detailed step it is as follows：
3.1) the antenna theory yield value G1 of mobile communication base station is obtained；
3.2) the length L1 of 1/2 wire jumper of antenna of mobile communication base station, the length L2 of 7/8 feeder line, jointing are obtained
Quantity n, and the final gain value of aerial panel is reached according to the antenna that formula (4) calculates mobile communication base station；
G=10(G1-(a×L1+b×L2+c×n+d))/10 (4)
In formula (4), G represents that the antenna of mobile communication base station reaches the final gain value of aerial panel, and G1 represents mobile logical
Believe the antenna theory yield value of base station, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, and L2 represents mobile communication base
The length of 7/8 feeder line of station antenna, n represents the quantity of the jointing of antenna of mobile communication base station, and a represents mobile communication base station
Every meter of loss of 1/2 wire jumper of antenna, b represents every meter of loss of 7/8 wire jumper of antenna of mobile communication base station, and c represents mobile logical
Believe the jointing loss of antenna for base station, d represents the arrester loss of antenna of mobile communication base station.
For bs antenna gain, the antenna theory yield value G1 that producer is given does not consider loss, directly using the day
Lineation opinion yield value G1 will cause to predict the outcome much larger.In view of the actual construction in base station, ruuning situation, opened from base station machine room
Begin, what to be lost by 1/2 wire jumper, 7/8 feeder line, jointing, arrester etc., therefore in mobile communication base in the present embodiment
On the basis of the antenna theory yield value G1 for standing, length L1's, 7/8 feeder line with reference to 1/2 wire jumper of antenna of mobile communication base station
The quantity n of length L2, jointing, and aerial panel is reached according to the antenna that formula (2) calculate amendment mobile communication base station
Final gain value.Assuming that antenna gain is G1, antenna gain loss is G2,1/2 wire jumper, the length of 7/8 feeder line used by base station
Respectively L1 and L2, the number of jointing is n, then according to actual conditions, then the antenna of mobile communication base station reaches antenna surface
The final gain value of plate is represented by expression formula shown in formula (4-1).
G=10(G1-G2)/10 (4-1)
In formula (4-1), G represents that the antenna of mobile communication base station reaches the final gain value of aerial panel, and G1 represents mobile
The antenna theory yield value of communication base station, G2 represents the aerial loss of mobile communication base station.
For GSM900 antennas, every meter of loss of 1/2 wire jumper of antenna of mobile communication base station is 0.07dB, mobile communication base
Every meter of loss of 7/8 wire jumper of station antenna is 0.0403dB, and the jointing loss c of antenna of mobile communication base station is 0.05dB/
Individual, the arrester loss of antenna of mobile communication base station is 0.5dB.Therefore, the aerial loss G2 of mobile communication base station can be expressed as
Expression formula shown in formula (4-2).
G2=0.07 × L1+0.0403 × L2+0.05 × n+0.5 (4-2)
In formula (4-2), G represents that the antenna of mobile communication base station reaches the final gain value of aerial panel, and G1 represents mobile
The antenna theory yield value of communication base station, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, and L2 represents mobile communication
The length of 7/8 feeder line of antenna for base station, n represents the quantity of the jointing of antenna of mobile communication base station.
The present embodiment step 4) antenna radiated power Forecasting Model of Density shown in Chinese style (3) derivation it is as follows：
4.1) the antennas orthogonal face normalization directivity function shown in formula (1) is drawn as the uniform straight line array directivity function of antenna
Directivity function is normalized with the horizontal plane shown in formula (2).
4.2) it is well known that shown in the main lobe width of uniform straight line array such as formula (3-1)；The antenna wavelength of mobile communication base station
As shown in formula (3-2).
In formula (3-1), ψ0.5The main lobe width of uniform straight line array is represented, λ represents the antenna wavelength of mobile communication base station, n tables
Show bay number, d represents bay spacing.
In formula (3-2), λ represents the antenna wavelength of mobile communication base station, and k represents the antenna beam of mobile communication base station.
4.3) formula (3-1), formula (3-2) are substituted into formula (1), then can obtain the expression formula of formula (3-3).
In formula (3-3), θ represents antenna main lobe axially and horizontal coordinate face angle, ψ0.5Represent the antenna of mobile communication base station
Vertical plane half-power angle, n represents bay number.
Formula (3-3) further can approximately be reduced to the expression formula of formula (3-4).
In formula (3-4), θ represents antenna main lobe axially and horizontal coordinate face angle, ψ0.5Represent the antenna of mobile communication base station
Vertical plane half-power angle.On the basis of formula (3-4), then with reference to antenna for base station transmission power and antenna gain, antenna for base station electricity
Magnetic radiation power density forecast model is represented by the expression formula of formula (3-5).
In formula (3-5), S represents the antenna radiated power density of future position, and P represents the antenna transmitting work(of mobile communication base station
Rate, G represent antenna reach aerial panel final gain value, r represent future position between the antenna of mobile communication base station away from
From θ represents antenna main lobe axially and horizontal coordinate face angle, ψ0.5The antennas orthogonal face half-power angle of mobile communication base station is represented,
M represents that antenna horizontal plane normalizes the fitting coefficient of directivity function,Represent antenna main lobe axial direction and the water of mobile communication base station
Flat reference axis forward direction angle.After in view of Downtilt δ, then formula (3-5) is convertible obtains expression formula shown in formula (3).
In sum, the present embodiment calculates level, the vertical plane normalization directivity function for providing antenna for base station first, surveys
Examination fitting obtains the fitting coefficient that the antenna horizontal plane normalizes directivity function, and the antenna theory based on mobile communication base station increases
Benefit value, loss, the loss of 7/8 feeder line, the loss of jointing with reference to 1/2 wire jumper of mobile communication base station, the damage of arrester
Consumption determines that the antenna of mobile communication base station reaches the final gain value of aerial panel, and then combines antenna transmission power and antenna increasing
Benefit, sets up the computation model of antenna for base station electromagnetic radiance density, calculates and is applicable to any azimuthal aerial radiation
Power density, because during antenna for base station normalization directivity function is given, the method being fitted using experimental test is given
Coefficient correlation, improves accuracy in computation；Simultaneously according to the actual construction situation of antenna, accurate antenna gain conduct is given
Antenna reaches the final gain value of aerial panel, is finally obtained more accurate antenna for base station electromagnetic radiance density, has
There is accuracy higher, can be applied to the calculating of any azimuth antenna of mobile communication base station electromagnetic radiance density.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of antenna of mobile communication base station radiosity computational methods, it is characterised in that implementation steps are as follows：
1) antenna for mobile communication base station sets up the antennas orthogonal face shown in formula (1) normalization directivity function and formula (2) institute
The horizontal plane normalization directivity function for showing；
In formula (1) and formula (2), F (θ) represents antennas orthogonal face normalization directivity function, and n represents bay number, and k represents base
The wave number of station antenna, d represents bay spacing, and θ represents antenna main lobe axially and horizontal coordinate face angle；Represent day
Line horizontal plane normalizes directivity function, and M represents that antenna horizontal plane normalizes the fitting coefficient of directivity function,Represent antenna main lobe
Axially with horizontal axis forward direction angle；
2) for the measuring point on day line options distance to a declared goal vertical plane, by obtaining the antenna radiated power data of measuring point and being directed to
Formula (1) and formula (2) are fitted and obtain the fitting coefficient M that the antenna horizontal plane normalizes directivity function；
3) the antenna theory yield value based on mobile communication base station, loss, 7/8 feedback with reference to 1/2 wire jumper of mobile communication base station
The loss of line, the loss of jointing, the loss of arrester determine that the antenna of mobile communication base station reaches the final of aerial panel
Yield value G；
4) the antenna radiated power Forecasting Model of Density shown in formula (3) is set up；By the antenna horizontal plane of the mobile communication base station
Normalize the antenna spoke shown in fitting coefficient M, final gain value G substitutions formula (3) of antenna arrival aerial panel of directivity function
Power density forecast model is penetrated, the antenna radiated power density of future position is calculated；
In formula (3), S represents the antenna radiated power density of future position, and P represents the antenna transmission power of mobile communication base station, G tables
Show that antenna reaches the final gain value of aerial panel, r represents the distance between the antenna of future position away from mobile communication base station, θ tables
Show antenna main lobe axial direction and horizontal coordinate face angle, δ represents the Downtilt of mobile communication base station, ψ0.5Represent mobile communication
The antennas orthogonal face half-power angle of base station, M represents that antenna horizontal plane normalizes the fitting coefficient of directivity function,Represent mobile logical
Believe antenna main lobe axial direction and the horizontal axis forward direction angle of base station.
2. antenna of mobile communication base station radiosity computational methods according to claim 1, it is characterised in that described
Step 2) detailed step it is as follows：
2.1) in the antenna main lobe horizontal plane specified angle interval direction of acquisition mobile communication base station, apart from antenna distance to a declared goal position
It is detection path to put the vertical plane at place；
2.2) highly for the downward interval setting of starting point is pre- where the center of antenna on the detection path from mobile communication base station
If quantity measuring point, the aerial radiation of each measuring point is tested respectively by radiating frequency selector under the working condition of mobile communication base station
Power data；
2.3) with antenna main lobe axial direction, the electromagnetic radiance density at antenna distance to a declared goal position of mobile communication base station
As normalization reference value, by step 2.2) in the antenna radiated power data of each measuring point that obtain and the normalization
Reference value is divided by and is normalized, and is fitted for formula (1) and formula (2), obtains the antenna water for causing that fitting result is best
Plane normalizes the fitting coefficient M of directivity function.
3. antenna of mobile communication base station radiosity computational methods according to claim 2, it is characterised in that：It is described
Step 2.1) in mobile communication base station antenna main lobe horizontal plane specified angle interval direction specifically refer to mobile communication base station
- 30 °~+30 ° directions in interval of antenna main lobe horizontal plane.
4. antenna of mobile communication base station radiosity computational methods according to claim 3, it is characterised in that：It is described
Step 2.1) in be specially 5 meters apart from antenna distance to a declared goal position.
5. antenna of mobile communication base station radiosity computational methods according to claim 4, it is characterised in that：It is described
Step 2.2) in be highly the downward interval setting of starting point where center of antenna on the detection path from mobile communication base station
The spacing distance of adjacent measuring point is 1 meter during predetermined number measuring point, and the total quantity of the measuring point is 5.
6. antenna of mobile communication base station radiosity computational methods according to any one in Claims 1 to 5, its
Be characterised by, the step 3) detailed step it is as follows：
3.1) the antenna theory yield value G1 of mobile communication base station is obtained；
3.2) length L1, the length L2 of 7/8 feeder line, the quantity of jointing of 1/2 wire jumper of antenna of mobile communication base station are obtained
N, and the final gain value of aerial panel is reached according to the antenna that formula (4) calculates mobile communication base station；
G=10(G1-(a×L1+b×L2+c×n+d))/10 (4)
In formula (4), G represents that the antenna of mobile communication base station reaches the final gain value of aerial panel, and G1 represents mobile communication base
The antenna theory yield value stood, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, and L2 represents mobile communication base station day
The length of 7/8 feeder line of line, n represents the quantity of the jointing of antenna of mobile communication base station, and a represents antenna of mobile communication base station
Every meter of 1/2 wire jumper loss, b represents every meter of loss of 7/8 wire jumper of antenna of mobile communication base station, and c represents mobile communication base
The jointing loss of station antenna, d represents the arrester loss of antenna of mobile communication base station.
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