CN104237651A - Method for calculating radiation power density of antenna of mobile communication base station - Google Patents
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Abstract
The invention discloses a method for calculating the radiation power density of an antenna of a mobile communication base station. The method comprises the steps that a horizontal plane normalization directivity function and a vertical plane normalization directivity function are established, a measuring point away from a vertical plane by the assigned distance is selected for the antenna, the fitting coefficient of the horizontal plane normalization directivity function of the antenna is obtained by obtaining the antenna radiation power data at the measuring point and performing fitting, the final gain value from the antenna of the mobile communication base station to an antenna panel is determined based on the antenna theoretical gain value of the mobile communication base station, a computing model for the radiation power density of the antenna of the base station is established according to the fitting coefficient of the horizontal plane normalization directivity function of the antenna and the finial gain value from the antenna to the antenna panel, and the antenna radiation power density suitable for any azimuth angle can be worked out. The method has the advantages of being high in accuracy and suitable for any azimuth angle.
Description
Technical field
The invention belongs to field of environment engineering technology, be specifically related to a kind of antenna of mobile communication base station radiosity computing method, be applicable to Accurate Prediction and the environmental quality assessment of mobile communication base station antenna radiated power density under any position angle.
Background technology
In recent years along with the fast development of Communication in China technology, engineering construction speed in mobile communication base station is accelerated, and the electromagnetic radiation environment impact of mobile communication base station also causes social extensive concern day by day.Power density evaluates the Main Factors of antenna for base station electromagnetic radiation level, and Accurate Prediction antenna for base station electromagnetic radiance density can be base station construction provides guidance, exceeds standard to avoid antenna for base station electromagnetic radiation.But; at present for the prediction of antenna for base station electromagnetic radiation; " radiation environment conservative management directive/guide electromagnetic radiation monitoring instruments and methods " (HJ/T 10.2-1996) only gives axial power density calculation method, cannot realize the prediction of other direction electromagnetic radiance density of antenna for base station.
Summary of the invention
The technical problem to be solved in the present invention is: for the above-mentioned technical matters of prior art, provide a kind of accuracy high, be applicable to any azimuthal antenna of mobile communication base station radiosity computing method.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of antenna of mobile communication base station radiosity computing method, implementation step is as follows:
1) the surface level normalization directivity function shown in the antennas orthogonal face normalization directivity function shown in formula (1) and formula (2) set up by the antenna for mobile communication base station;
In formula (1) and formula (2), F (θ) represents antennas orthogonal face normalization directivity function, and n represents bay number, and k represents the wave number of antenna for base station, d represents antenna spacing, and θ represents antenna main lobe axis and horizontal coordinate face angle;
represent antenna surface level normalization directivity function, M represents the fitting coefficient of antenna surface level normalization directivity function,
represent antenna main lobe axis and horizontal axis forward angle;
2) for the measuring point on sky line options distance to a declared goal vertical plane, by obtaining the antenna radiated power data of measuring point and carrying out for formula (1) and formula (2) the fitting coefficient M that matching obtains described antenna surface level normalization directivity function;
3) based on the antenna theory yield value of mobile communication base station, determine that the antenna of mobile communication base station arrives the final gain value G of aerial panel in conjunction with the loss of 1/2 wire jumper of mobile communication base station, the loss of 7/8 feeder line, the loss of jointing, the loss of lightning arrester;
4) the antenna radiated power Forecasting Model of Density shown in formula (3) is set up; The fitting coefficient M of the antenna surface level normalization directivity function of described mobile communication base station, antenna are arrived the antenna radiated power Forecasting Model of Density shown in final gain value G substitution formula (3) of aerial panel, calculates the antenna radiated power density of future position;
In formula (3), S represents the antenna radiated power density of future position, P represents the antenna transmission power of mobile communication base station, G represents that antenna arrives the final gain value of aerial panel, r represents the distance between the antenna of future position distance mobile communication base station, θ represents antenna main lobe axis and horizontal coordinate face angle, and δ represents the Downtilt of mobile communication base station, ψ
0.5represent the antennas orthogonal face half-power angle of mobile communication base station, M represents the fitting coefficient of antenna surface level normalization directivity function,
represent antenna main lobe axis and the horizontal axis forward angle of mobile communication base station.
Preferably, described step 2) detailed step as follows:
2.1) obtaining in the interval direction of antenna main lobe surface level specified angle of mobile communication base station, apart from the vertical plane of antenna distance to a declared goal position is detection path;
2.2) be that the downward interval of starting point arranges a predetermined number measuring point from the center of antenna place height of mobile communication base station on described detection path, under the duty of mobile communication base station, tested the antenna radiated power data of each measuring point by radiation frequency selector respectively;
2.3) using the electromagnetic radiance density of the antenna main lobe of mobile communication base station axis, distance antenna distance to a declared goal position as normalization reference value, by step 2.2) in the described antenna radiated power data of each measuring point described that obtain and described normalization reference value be divided by and be normalized, and carry out matching for formula (1) and formula (2), obtain the fitting coefficient M of the antenna surface level normalization directivity function making fitting result best.
Preferably, described step 2.1) in the interval direction of antenna main lobe surface level specified angle of mobile communication base station specifically refer to the direction that-30 ° ~+30 °, the antenna main lobe surface level of mobile communication base station is interval.
Preferably, described step 2.1) middle distance antenna distance to a declared goal position is specially 5 meters.
Preferably, described step 2.2) on described detection path from the center of antenna place height of mobile communication base station be starting point downward interval predetermined number measuring point is set time adjacent measuring point spacing distance be 1 meter, and the total quantity of described measuring point is 5.
Preferably, described step 3) detailed step as follows:
3.1) the antenna theory yield value G1 of mobile communication base station is obtained;
3.2) obtain length L1, the length L2 of 7/8 feeder line, the quantity n of jointing of 1/2 wire jumper of antenna of mobile communication base station, and calculate the final gain value of the antenna arrival aerial panel of mobile communication base station according to formula (4);
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 arrives the final gain value of aerial panel, G1 represents the antenna theory yield value of mobile communication base station, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, L2 represents the length of 7/8 feeder line of antenna of mobile communication base station, n represents the quantity of the jointing of antenna of mobile communication base station, a represents every meter of loss of 1/2 wire jumper of antenna of mobile communication base station, b represents every meter of loss of 7/8 wire jumper of antenna of mobile communication base station, c represents the jointing loss of antenna of mobile communication base station, d represents the lightning arrester loss of antenna of mobile communication base station.
Antenna of mobile communication base station radiosity computing method of the present invention have following advantage: antenna of mobile communication base station radiosity computing method of the present invention set up antenna surface level normalization directivity function for the antenna of mobile communication base station, vertical plane normalization directivity function, undertaken testing the fitting coefficient that matching obtains antenna surface level normalization directivity function by the antenna radiated power data detecting measuring point, improve the accuracy of calculating, simultaneously based on the antenna theory yield value of mobile communication base station, in conjunction with the loss of 1/2 wire jumper of mobile communication base station, the loss of 7/8 feeder line, the loss of jointing, the loss of lightning arrester determines that the antenna of mobile communication base station arrives the final gain value of aerial panel, give accurate antenna final gain value, at the fitting coefficient of surface level normalization directivity function, on the more accurate basis reliably of both final gain values of aerial panel, by the level based on antenna for base station, the antenna radiated power Forecasting Model of Density that vertical plane normalization directivity function is set up, the horizontal and vertical directivity function that the foundation of this forecast model considers antenna for base station simultaneously finally obtains the electromagnetic radiance density calculation method that accurately can calculate different orientations antenna for base station far field, the antenna radiated power density of future position can be calculated fast, thus the electromagnetic radiance density in antenna for base station different orientations far field can be predicted more exactly, there is accuracy high, be applicable to any azimuthal advantage, electromagnetic radiation prediction and the environmental quality assessment of all kinds of antenna of mobile communication base station can be widely used in.
Accompanying drawing explanation
Fig. 1 is the basic skills schematic flow sheet of the embodiment of the present invention.
Embodiment
Below for the GSM900 antenna of mobile communication base station, the angle of declination of this antenna is 5 °, and hereafter by the present invention is further detailed explanation in conjunction with the accompanying drawings and embodiments, but this embodiment should not be construed as limitation of the present invention.
As shown in Figure 1, the implementation step of the present embodiment antenna of mobile communication base station radiosity computing method is as follows:
1) the surface level normalization directivity function shown in the antennas orthogonal face normalization directivity function shown in formula (1) and formula (2) set up by the antenna for mobile communication base station;
In formula (1) and formula (2), F (θ) represents antennas orthogonal face normalization directivity function, and n represents bay number, and k represents the wave number of antenna for base station, d represents antenna spacing, and θ represents antenna main lobe axis and horizontal coordinate face angle;
represent antenna surface level normalization directivity function, M represents the fitting coefficient of antenna surface level normalization directivity function,
represent antenna main lobe axis and horizontal axis forward angle;
2) for the measuring point on sky line options distance to a declared goal vertical plane, by obtaining the antenna radiated power data of measuring point and carrying out for formula (1) and formula (2) the fitting coefficient M that matching obtains antenna surface level normalization directivity function;
3) based on the antenna theory yield value of mobile communication base station, determine that the antenna of mobile communication base station arrives the final gain value G of aerial panel in conjunction with the loss of 1/2 wire jumper of mobile communication base station, the loss of 7/8 feeder line, the loss of jointing, the loss of lightning arrester;
4) the antenna radiated power Forecasting Model of Density shown in formula (3) is set up; The fitting coefficient M of the antenna surface level normalization directivity function of mobile communication base station, antenna are arrived the antenna radiated power Forecasting Model of Density shown in final gain value G substitution formula (3) of aerial panel, calculates the antenna radiated power density of future position;
In formula (3), S represents the antenna radiated power density of future position, P represents the antenna transmission power of mobile communication base station, G represents that antenna arrives the final gain value of aerial panel, r represents the distance between the antenna of future position distance mobile communication base station, θ represents antenna main lobe axis and horizontal coordinate face angle, and δ represents the Downtilt of mobile communication base station, ψ
0.5represent the antennas orthogonal face half-power angle of mobile communication base station, M represents the fitting coefficient of antenna surface level normalization directivity function,
represent antenna main lobe axis and the horizontal axis forward angle of mobile communication base station.
In the present embodiment, step 2) detailed step as follows:
2.1) obtaining in the interval direction of antenna main lobe surface level specified angle of mobile communication base station, apart from the vertical plane of antenna distance to a declared goal position is detection path; In the present embodiment, step 2.1) in the interval direction of antenna main lobe surface level specified angle of mobile communication base station specifically refer to the direction that-30 ° ~+30 °, the antenna main lobe surface level of mobile communication base station is interval; Distance antenna distance to a declared goal position is specially 5 meters.
2.2) be that the downward interval of starting point arranges a predetermined number measuring point from the center of antenna place height of mobile communication base station on detection path, under the duty of mobile communication base station, tested the antenna radiated power data of each measuring point by radiation frequency selector respectively; In the present embodiment, step 2.2) in detect on path from the center of antenna place height of mobile communication base station be starting point downward interval predetermined number measuring point is set time adjacent measuring point spacing distance be 1 meter, and the total quantity of measuring point is 5.
2.3) using the electromagnetic radiance density of the antenna main lobe of mobile communication base station axis, distance antenna distance to a declared goal position as normalization reference value, by step 2.2) in the antenna radiated power data of each measuring point that obtain and normalization reference value be divided by and be normalized, and carry out matching for formula (1) and formula (2), obtain the fitting coefficient M of the antenna surface level normalization directivity function making fitting result best.In the present embodiment, the fitting coefficient M of antenna surface level normalization directivity function rounds numerical value, and by when carrying out matching after experimental test data normalization, when the fitting coefficient M of antenna surface level normalization directivity function gets 9, fitting result is best.
Preferably, step 3) detailed step as follows:
3.1) the antenna theory yield value G1 of mobile communication base station is obtained;
3.2) obtain length L1, the length L2 of 7/8 feeder line, the quantity n of jointing of 1/2 wire jumper of antenna of mobile communication base station, and calculate the final gain value of the antenna arrival aerial panel of mobile communication base station according to formula (4);
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 arrives the final gain value of aerial panel, G1 represents the antenna theory yield value of mobile communication base station, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, L2 represents the length of 7/8 feeder line of antenna of mobile communication base station, n represents the quantity of the jointing of antenna of mobile communication base station, a represents every meter of loss of 1/2 wire jumper of antenna of mobile communication base station, b represents every meter of loss of 7/8 wire jumper of antenna of mobile communication base station, c represents the jointing loss of antenna of mobile communication base station, d represents the lightning arrester loss of antenna of mobile communication base station.
For bs antenna gain, the antenna theory yield value G1 that producer provides does not consider loss, directly adopts this antenna theory yield value G1 will cause predicting the outcome much larger.Consider the actual construction in base station, ruuning situation, from base station machine room, will through what losses such as 1/2 wire jumper, 7/8 feeder line, jointing, lightning arresters, therefore in the present embodiment on the basis of the antenna theory yield value G1 of mobile communication base station, in conjunction with length L1, the length L2 of 7/8 feeder line, the quantity n of jointing of 1/2 wire jumper of antenna of mobile communication base station, and carry out calculating according to formula (2) the final gain value that the antenna revising mobile communication base station arrives aerial panel.Suppose that antenna gain is G1, antenna gain loss is G2, the length of base station 1/2 wire jumper used, 7/8 feeder line is respectively L1 and L2, the number of jointing is n, then according to actual conditions, then the final gain value of the antenna arrival aerial panel of mobile communication base station can be expressed as 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 arrives the final gain value of aerial panel, and G1 represents the antenna theory yield value of mobile communication base station, and G2 represents the aerial loss of mobile communication base station.
GSM900 antenna, every meter of loss of 1/2 wire jumper of antenna of mobile communication base station is 0.07dB, every meter of loss of 7/8 wire jumper of antenna of mobile communication base station is 0.0403dB, the jointing loss c of antenna of mobile communication base station is 0.05dB/, and the lightning 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 arrives the final gain value of aerial panel, G1 represents the antenna theory yield value of mobile communication base station, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, L2 represents the length of 7/8 feeder line of antenna of mobile communication base station, and n represents the quantity of the jointing of antenna of mobile communication base station.
The present embodiment step 4) derivation of the antenna radiated power Forecasting Model of Density shown in Chinese style (3) is as follows:
4.1) the surface level normalization directivity function shown in the antennas orthogonal face normalization directivity function shown in formula (1) and formula (2) is drawn by the uniform straight line array directivity function of antenna.
4.2) well-known, the main lobe width of uniform straight line array is such as formula shown in (3-1); The antenna wavelength of mobile communication base station is such as formula shown in (3-2).
In formula (3-1), ψ
0.5represent the main lobe width of uniform straight line array, λ represents the antenna wavelength of mobile communication base station, and n represents bay number, and d represents antenna 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 axis and horizontal coordinate face angle, ψ
0.5represent the antennas orthogonal face half-power angle of mobile communication base station, n represents bay number.
Formula (3-3) can be similar to the expression formula of the formula that is reduced to (3-4) further.
In formula (3-4), θ represents antenna main lobe axis and horizontal coordinate face angle, ψ
0.5represent the antennas orthogonal face half-power angle of mobile communication base station.On the basis of formula (3-4), then in conjunction with antenna for base station emissive power and antenna gain, antenna for base station electromagnetic radiance Forecasting Model of Density can be expressed as the expression formula of formula (3-5).
In formula (3-5), S represents the antenna radiated power density of future position, P represents the antenna transmission power of mobile communication base station, G represents that antenna arrives the final gain value of aerial panel, r represents the distance between the antenna of future position distance mobile communication base station, θ represents antenna main lobe axis and horizontal coordinate face angle, ψ
0.5represent the antennas orthogonal face half-power angle of mobile communication base station, M represents the fitting coefficient of antenna surface level normalization directivity function,
represent antenna main lobe axis and the horizontal axis forward angle of mobile communication base station.After considering Downtilt δ, then formula (3-5) is convertible obtains expression formula shown in formula (3).
In sum, first the present embodiment calculates the level providing antenna for base station, vertical plane normalization directivity function, test matching obtains the fitting coefficient of described antenna surface level normalization directivity function, based on the antenna theory yield value of mobile communication base station, in conjunction with the loss of 1/2 wire jumper of mobile communication base station, the loss of 7/8 feeder line, the loss of jointing, the loss of lightning arrester determines that the antenna of mobile communication base station arrives the final gain value of aerial panel, and then in conjunction with antenna transmission power and antenna gain, set up the computation model of antenna for base station electromagnetic radiance density, calculate and be applicable to any azimuthal antenna radiated power density, owing to providing in antenna for base station normalization directivity function process, the method of experimental test matching is adopted to provide related coefficient, improve accuracy in computation, simultaneously according to the actual construction situation of antenna, give antenna gain accurately and arrive the final gain value of aerial panel as antenna, finally obtain antenna for base station electromagnetic radiance density more accurately, there is higher accuracy, can be applicable to the calculating of any position angle antenna of mobile communication base station electromagnetic radiance density.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. antenna of mobile communication base station radiosity computing method, is characterized in that implementation step is as follows:
1) the surface level normalization directivity function shown in the antennas orthogonal face normalization directivity function shown in formula (1) and formula (2) set up by the antenna for mobile communication base station;
In formula (1) and formula (2), F (θ) represents antennas orthogonal face normalization directivity function, and n represents bay number, and k represents the wave number of antenna for base station, d represents antenna spacing, and θ represents antenna main lobe axis and horizontal coordinate face angle;
represent antenna surface level normalization directivity function, M represents the fitting coefficient of antenna surface level normalization directivity function,
represent antenna main lobe axis and horizontal axis forward angle;
2) for the measuring point on sky line options distance to a declared goal vertical plane, by obtaining the antenna radiated power data of measuring point and carrying out for formula (1) and formula (2) the fitting coefficient M that matching obtains described antenna surface level normalization directivity function;
3) based on the antenna theory yield value of mobile communication base station, determine that the antenna of mobile communication base station arrives the final gain value G of aerial panel in conjunction with the loss of 1/2 wire jumper of mobile communication base station, the loss of 7/8 feeder line, the loss of jointing, the loss of lightning arrester;
4) the antenna radiated power Forecasting Model of Density shown in formula (3) is set up; The fitting coefficient M of the antenna surface level normalization directivity function of described mobile communication base station, antenna are arrived the antenna radiated power Forecasting Model of Density shown in final gain value G substitution formula (3) of aerial panel, calculates the antenna radiated power density of future position;
In formula (3), S represents the antenna radiated power density of future position, P represents the antenna transmission power of mobile communication base station, G represents that antenna arrives the final gain value of aerial panel, r represents the distance between the antenna of future position distance mobile communication base station, θ represents antenna main lobe axis and horizontal coordinate face angle, and δ represents the Downtilt of mobile communication base station, ψ
0.5represent the antennas orthogonal face half-power angle of mobile communication base station, M represents the fitting coefficient of antenna surface level normalization directivity function,
represent antenna main lobe axis and the horizontal axis forward angle of mobile communication base station.
2. antenna of mobile communication base station radiosity computing method according to claim 1, is characterized in that, described step 2) detailed step as follows:
2.1) obtaining in the interval direction of antenna main lobe surface level specified angle of mobile communication base station, apart from the vertical plane of antenna distance to a declared goal position is detection path;
2.2) be that the downward interval of starting point arranges a predetermined number measuring point from the center of antenna place height of mobile communication base station on described detection path, under the duty of mobile communication base station, tested the antenna radiated power data of each measuring point by radiation frequency selector respectively;
2.3) using the electromagnetic radiance density of the antenna main lobe of mobile communication base station axis, distance antenna distance to a declared goal position as normalization reference value, by step 2.2) in the antenna radiated power data of each measuring point described that obtain and described normalization reference value be divided by and be normalized, and carry out matching for formula (1) and formula (2), obtain the fitting coefficient M of the antenna surface level normalization directivity function making fitting result best.
3. antenna of mobile communication base station radiosity computing method according to claim 2, is characterized in that: described step 2.1) in the interval direction of antenna main lobe surface level specified angle of mobile communication base station specifically refer to the direction that-30 ° ~+30 °, the antenna main lobe surface level of mobile communication base station is interval.
4. antenna of mobile communication base station radiosity computing method according to claim 3, is characterized in that: described step 2.1) middle distance antenna distance to a declared goal position is specially 5 meters.
5. antenna of mobile communication base station radiosity computing method according to claim 4, it is characterized in that: described step 2.2) on described detection path from the center of antenna place height of mobile communication base station be starting point downward interval predetermined number measuring point is set time adjacent measuring point spacing distance be 1 meter, and the total quantity of described measuring point is 5.
6., according to the antenna of mobile communication base station radiosity computing method in Claims 1 to 5 described in any one, it is characterized in that, described step 3) detailed step as follows:
3.1) the antenna theory yield value G1 of mobile communication base station is obtained;
3.2) obtain length L1, the length L2 of 7/8 feeder line, the quantity n of jointing of 1/2 wire jumper of antenna of mobile communication base station, and calculate the final gain value of the antenna arrival aerial panel of mobile communication base station according to formula (4);
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 arrives the final gain value of aerial panel, G1 represents the antenna theory yield value of mobile communication base station, L1 represents the length of 1/2 wire jumper of antenna of mobile communication base station, L2 represents the length of 7/8 feeder line of antenna of mobile communication base station, n represents the quantity of the jointing of antenna of mobile communication base station, a represents every meter of loss of 1/2 wire jumper of antenna of mobile communication base station, b represents every meter of loss of 7/8 wire jumper of antenna of mobile communication base station, c represents the jointing loss of antenna of mobile communication base station, d represents the lightning arrester loss of antenna of mobile communication base station.
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