CN114154326A - Method and system for selecting site of 5G antenna suspension position on shared iron tower - Google Patents
Method and system for selecting site of 5G antenna suspension position on shared iron tower Download PDFInfo
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Abstract
The invention relates to a method and a system for selecting a site of a 5G antenna suspension position on a shared iron tower, wherein the method comprises the steps of obtaining the electrical parameters of an overhead line and the geometric parameters of a tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure; calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters; determining a first area according to the power frequency magnetic field intensity at each position and a preset power frequency magnetic field limit value; calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters; determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value; and determining the highest installation point in the second area as the antenna suspension position. The invention provides the site selection method from the angles of the power frequency magnetic field and the radio frequency electromagnetic field, thereby accurately determining the installation position of the 5G antenna.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a system for selecting a site of a 5G antenna suspension position on a shared iron tower.
Background
As the requirements of mobile communication networks for capacity and coverage are continuously increased, the number of communication base stations is also increased. Therefore, a shared iron tower with a communication base station function added on the existing high-voltage transmission line iron tower is becoming a new resource sharing mode.
The open sharing of the 'power tower' and the 'communication tower' forms a huge 'interest' for promoting the coordinated development of power and communication infrastructure, particularly for the upcoming 5G network deployment, and can be called as a Chinese character: the method has the advantages that the densely distributed power towers along the urban and rural areas and the highway railway in the whole country are used for communication construction, so that the wide coverage and the fast coverage of a telecommunication network can be promoted, the construction period is greatly shortened, the construction efficiency of a communication base station is improved, the construction cost of the communication base station is reduced, and the deep coverage of a 4G network and the fast deployment of a 5G network are supported; secondly, a co-construction sharing cooperation mode for marketing of power and communication enterprises is promoted, the inventory resources of the power grid enterprises can be promoted, the benefits can be improved, and the functions of asset value preservation, value increment and amplification are facilitated; and thirdly, land resources occupied by the newly added communication iron tower base station and the influence of the newly added communication iron tower base station on the environment are effectively reduced.
Considering the coverage area, the 5G antenna is required to be hung at the tower as high as possible, but the 5G base station with too high hanging is bound to be affected by the live structure of the transmission line.
Since the shared iron tower is built in partial areas, the suspension position of the 5G antenna is generally determined according to the principle of electrical safety set distance. Namely: the minimum electrical distance between the 5G antenna and the electrified part of the power transmission tower is determined from two aspects of safe operation and technical economy and reasonableness according to the insulation characteristic of air, temperature, humidity, air density and other factors which may influence the insulation characteristic.
When the communication antenna equipment is installed on the power transmission iron tower, the safe operation of the power transmission line is ensured, and the safe distance between a live part and an iron tower member (including a communication antenna) is ensured. In principle, the installation of the communication antenna should not reduce the minimum safe distance of the live part of the transmission line. If there is a special case that needs to reduce the electrical clearance of the original line, the overvoltage level and the insulation matching level of the line need to be combined. This principle has already formed a standard, such as the standard GB50545-2010 "110 kV-750 kV overhead transmission line design specification" which gives a definite value for the minimum clearance of the live part of the line with the tower elements (including the stay wires, the foot nails, etc.) for each voltage class, which should comply with regulations. The 5G antenna suspension is determined with reference to this principle. However, the specified distance is too loose, so that the checking gap between the live part and the tower and the grounding part meets the electrical safety geometric distance, but the electromagnetic compatibility requirement cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method and a system for selecting a site of a 5G antenna suspension position on a shared iron tower.
In order to achieve the purpose, the invention provides the following scheme:
a method for selecting a site of a 5G antenna suspension position on a shared iron tower comprises the following steps:
acquiring electrical parameters of an overhead line and geometric parameters of a tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure;
calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters;
determining a first area according to the power frequency magnetic field intensity at each position and a preset power frequency magnetic field limit value;
calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters;
determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value;
and determining the highest installation point in the second area as the antenna suspension position.
Preferably, the calculating the power frequency magnetic field strength according to the electrical parameter and the geometric parameter comprises:
determining power frequency current flowing through each section of conductor according to the current of the power transmission line, the radius of the conductor and the splitting number of the conductor;
determining a first distance between the center of the conductor and a point of a space to be subjected to a magnetic field according to the erection height and the tower geometric structure;
and calculating the power frequency magnetic field intensity according to the power frequency current and the distance.
Preferably, the calculation formula for calculating the power frequency magnetic field strength according to the power frequency current and the first distance is as follows:
wherein, mu0Is a preset magnetic permeability; i iskThe power frequency current is used as the power frequency current; r iskIs the first distance; and B is the power frequency magnetic field intensity.
Preferably, the determining a first region according to the power frequency magnetic field strength at each position and a preset power frequency magnetic field limit value includes:
acquiring the preset power frequency magnetic field limit value;
and determining the area in which the numerical value of the power frequency magnetic field intensity is smaller than the preset power frequency magnetic field limit value as the first area.
Preferably, said calculating a radio frequency electromagnetic field strength from said electrical parameter and said geometric parameter comprises:
determining a time domain expression of the corona current according to the current of the power transmission line;
performing Fourier transform on the time domain expression to obtain corona current under different frequency conditions;
determining a second distance between the center of the conductor and a point of a space to be subjected to a magnetic field according to the erection height and the tower geometric structure;
calculating the radio frequency electromagnetic field strength from the corona current and the second distance.
Preferably, the calculation formula for calculating the radio frequency electromagnetic field strength according to the corona current and the distance is as follows:
wherein, mu0Is a preset magnetic permeability; i isFIs the corona current; r isFIs the second distance; b' is the power frequency magnetic field intensity.
Preferably, the determining a second region according to the radio frequency electromagnetic field strength over the first region and a preset radio frequency magnetic field limit value comprises:
dividing the frequency band range of the radio frequency electromagnetic field intensity on the first area into a first frequency band threshold value and a second frequency band threshold value;
determining a first limit value of the preset radio frequency magnetic field limit value according to the first frequency band threshold value;
determining a second limit value of the preset radio frequency magnetic field limit value according to the second frequency band threshold value;
and determining an area in which the value of the radio frequency electromagnetic field strength in the first frequency band threshold value is smaller than the first limit value and an area in which the value of the radio frequency electromagnetic field strength in the second frequency band threshold value is smaller than the first limit value as the second area.
A5G antenna suspension position addressing system on a shared iron tower comprises:
the acquisition module is used for acquiring the electrical parameters of the overhead line and the geometric parameters of the tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure;
the first calculation module is used for calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters;
the first determining module is used for determining a first area according to the power frequency magnetic field strength at each position and a preset power frequency magnetic field limit value;
the second calculation module is used for calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters;
the second determination module is used for determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value;
and the third determining module is used for determining the highest installation point in the second area as the antenna suspension position.
Preferably, the first calculation module specifically includes:
the current calculation unit is used for determining the power frequency current flowing through each section of conductor according to the current of the power transmission line, the radius of the conductor and the splitting number of the conductor;
the distance calculation unit is used for determining a first distance between the center of the conductor and a point of a space to-be-solved magnetic field according to the erection height and the tower geometric structure;
and the field intensity calculating unit is used for calculating the power frequency magnetic field intensity according to the power frequency current and the distance.
Preferably, the first determining module specifically includes:
a limit value obtaining unit, configured to obtain the preset power frequency magnetic field limit value;
and the first determining unit is used for determining the area, in which the numerical value of the power frequency magnetic field strength is smaller than the preset power frequency magnetic field limit value, as the first area.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for selecting a site of a 5G antenna suspension position on a shared iron tower, wherein the method comprises the steps of obtaining the electrical parameters of an overhead line and the geometric parameters of a tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure; calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters; determining a first area according to the power frequency magnetic field intensity at each position and a preset power frequency magnetic field limit value; calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters; determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value; and determining the highest installation point in the second area as the antenna suspension position. The invention provides the site selection method from the angles of the power frequency magnetic field and the radio frequency electromagnetic field, thereby accurately determining the installation position of the 5G antenna.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method in an embodiment provided by the present invention;
FIG. 2 is a schematic diagram of a power frequency magnetic field calculation result in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a time-frequency characteristic of a corona current in an embodiment of the present invention;
FIG. 4 is a diagram illustrating maximum values of RF interference at different locations according to an embodiment of the present invention;
fig. 5 is a system module connection diagram in an embodiment provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, the inclusion of a list of steps, processes, methods, etc. is not limited to only those steps recited, but may alternatively include additional steps not recited, or may alternatively include additional steps inherent to such processes, methods, articles, or devices.
The invention aims to provide a method and a system for selecting a site of a 5G antenna suspension position on a shared iron tower, wherein the method for selecting the site is given from the angles of a power frequency magnetic field and a radio frequency electromagnetic field, so that the installation position of the 5G antenna is accurately determined.
The prior art discloses the regulation of the checking clearance between the tower and the grounding part in the electrified part, as shown in table 1, the distance is only a few meters, and at the moment, although the geometric distance of the electrical safety is met, the electromagnetic compatibility requirement cannot be met.
TABLE 1
Therefore, the invention refers to the 5G base station and the auxiliary equipment immunity test grade and requirement thereof required by YD/T2583.17-2019, and gives the addressing method from the angles of the power frequency magnetic field and the radio frequency electromagnetic field as shown in Table 2.
TABLE 2
Furthermore, the reason why the surge impact is not considered in the invention is that the antenna feed port of the 5G antenna is provided with a surge protector, and the protection range is set according to the standard limit value, so the surge impact can not influence the communication equipment connected with the antenna through the antenna feed port.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a method in an embodiment provided by the present invention, and as shown in fig. 1, the present invention provides a method for addressing a suspension position of a 5G antenna on a shared iron tower, including:
step 100: acquiring electrical parameters of an overhead line and geometric parameters of a tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure;
step 200: calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters;
step 300: determining a first area according to the power frequency magnetic field intensity at each position and a preset power frequency magnetic field limit value;
step 400: calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters;
step 500: determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value;
step 600: and determining the highest installation point in the second area as the antenna suspension position.
Specifically, in the first step in this embodiment, the electrical parameters and the geometric parameters of the overhead line and the tower, including voltage, current, wire radius, number of splits, erection height, and geometric structure of the tower, are first obtained.
Preferably, the step 200 comprises:
determining power frequency current flowing through each section of conductor according to the current of the power transmission line, the radius of the conductor and the splitting number of the conductor;
determining a first distance between the center of the conductor and a point of a space to be subjected to a magnetic field according to the erection height and the tower geometric structure;
and calculating the power frequency magnetic field intensity according to the power frequency current and the distance.
Preferably, the calculation formula for calculating the power frequency magnetic field strength according to the power frequency current and the first distance is as follows:
wherein, mu0Is a preset magnetic permeability; i iskThe power frequency current is used as the power frequency current; r iskIs the first distance; and B is the power frequency magnetic field intensity.
Preferably, the step 300 comprises:
acquiring the preset power frequency magnetic field limit value;
and determining the area in which the numerical value of the power frequency magnetic field intensity is smaller than the preset power frequency magnetic field limit value as the first area.
Optionally, the second step in this embodiment is: based on the obtained electrical parameters and geometric parameters, the power frequency magnetic field is calculated in the following manner, and the position D1 (first region) where the 5G antenna can be mounted is determined based on the calculation result of the power frequency magnetic field.
When the power transmission line normally runs, the electrified line can generate a power frequency electric field and a power frequency magnetic field in the surrounding space, and the power frequency magnetic field can be obtained by applying current excitation by applying an electromagnetic field numerical calculation method.
The calculation method comprises the following steps:
in the formula, k represents the number of conductor segments of the power transmission line, the power transmission line can be segmented according to 1m intervals, and the current flowing through each segment of conductor is IkThe distance between the centre of the conductor and the point in space where the magnetic field is to be calculated is rk。
Calculating power frequency magnetic field time IkThe value is the power frequency current flowing through the overhead line.
The power frequency magnetic field limit value of 3A/m is specified in the standard quoted in Table 2, so after the power frequency magnetic field calculation results of each point in space are obtained, an area smaller than 3A/m is selected, namely D1, as shown in FIG. 2, wherein the area outside the right thin black line is the area smaller than 3A/m.
Preferably, the step 400 comprises:
determining a time domain expression of the corona current according to the current of the power transmission line;
performing Fourier transform on the time domain expression to obtain corona current under different frequency conditions;
determining a second distance between the center of the conductor and a point of a space to be subjected to a magnetic field according to the erection height and the tower geometric structure;
and calculating the radio frequency electromagnetic field strength according to the corona current and the distance.
Specifically, the third step in this embodiment is to calculate the radio frequency electromagnetic field according to the obtained electrical parameters and geometric parameters, and determine the position D2 (the second area) where the 5G antenna can be installed.
Preferably, the calculation formula for calculating the radio frequency electromagnetic field strength according to the corona current and the distance is as follows:
wherein, mu0Is a preset magnetic permeability; i isFIs the corona current; r isFIs the second distance; b' is the power frequency magnetic field intensity.
Furthermore, the calculation formula for calculating the radio frequency electromagnetic field in the third step is the same as that for calculating the power frequency magnetic field, IFIs a corona current, rFAnd rkThe same value, when the corona current passes through the overhead line, the radio frequency electromagnetic field is generated in the adjacent space. The calculation steps are as follows:
1) calculating the frequency domain characteristic of the corona current by applying Fourier transform to obtain the current intensity under different frequencies;
the time domain expression of a general corona current is i (t) 2.7312ip(e-0.01214t-e-0.03508t) The peak coefficient of the corona current waveform of the 500kV power transmission line is ipThe calculation is 117.65mA, and for the transmission lines with different voltage grades, ipThe values of (a) and (b) are different, and the specific values depend on the test results.
Fourier transform is carried out on a time domain expression of the corona current, and the current obtained by calculation under the condition of different frequencies is IF. As shown in fig. 3, radio frequency electromagnetic fields at various positions in the space around the tower under different frequency conditions can be obtained by calculation according to the frequency spectrum, and in order to reduce the calculation amount, only the radiation electromagnetic field on the curve along the surface of the iron tower in fig. 3, which can be hung with a 5G antenna, can be calculated.
2) According to the aboveThe calculated current intensity can be used for calculating the radio frequency electromagnetic field of the corona current with different frequencies by using a calculation formula used by the radio frequency electromagnetic field, and the radio frequency electromagnetic field at the position of the tower along the surface within the range of D1 is only required to be calculated during calculation; the calculation frequency band is 80-6000 MHZ。
The maximum value of the radiated electromagnetic field at each point along the line is shown in fig. 4, from which it can be determined that the 5G antenna installation position must be below 5.2m (black bold line) from the lowermost tower arm.
Preferably, the step 500 comprises:
dividing the frequency band range of the radio frequency electromagnetic field intensity on the first area into a first frequency band threshold value and a second frequency band threshold value;
determining a first limit value of the preset radio frequency magnetic field limit value according to the first frequency band threshold value;
determining a second limit value of the preset radio frequency magnetic field limit value according to the second frequency band threshold value;
and determining an area in which the value of the radio frequency electromagnetic field strength in the first frequency band threshold value is smaller than the first limit value and an area in which the value of the radio frequency electromagnetic field strength in the second frequency band threshold value is smaller than the first limit value as the second area.
Specifically, referring to the limit value in table 2, the frequency band (80-690MHz, which is recorded as the first frequency band threshold): 3V/m (class 2, denoted as the first limit), band (690-6000MHz, denoted as the second band threshold): the 10V/m (class 3, noted as said second limit) is calculated according to the different frequency bands, the area below the limit being the position D2 where the 5G antenna can be installed.
As an alternative implementation manner, in this embodiment, the D2 region obtained according to the power frequency magnetic field and the radio frequency electromagnetic field obtained in the above steps, that is, the region where the 5G antenna can be installed, is selected to be the highest point or a position where installation is convenient.
Fig. 5 is a connection diagram of system modules in an embodiment provided by the present invention, and as shown in fig. 5, the present invention further provides a system for addressing a suspension position of a 5G antenna on a shared iron tower, including:
the acquisition module is used for acquiring the electrical parameters of the overhead line and the geometric parameters of the tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure;
the first calculation module is used for calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters;
the first determining module is used for determining a first area according to the power frequency magnetic field strength at each position and a preset power frequency magnetic field limit value;
the second calculation module is used for calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters;
the second determination module is used for determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value;
and the third determining module is used for determining the highest installation point in the second area as the antenna suspension position.
Preferably, the first calculation module specifically includes:
the current calculation unit is used for determining the power frequency current flowing through each section of conductor according to the current of the power transmission line, the radius of the conductor and the splitting number of the conductor;
the distance calculation unit is used for determining a first distance between the center of the conductor and a point of a space to-be-solved magnetic field according to the erection height and the tower geometric structure;
and the field intensity calculating unit is used for calculating the power frequency magnetic field intensity according to the power frequency current and the distance.
Preferably, the first determining module specifically includes:
a limit value obtaining unit, configured to obtain the preset power frequency magnetic field limit value;
and the first determining unit is used for determining the area, in which the numerical value of the power frequency magnetic field strength is smaller than the preset power frequency magnetic field limit value, as the first area.
The invention has the following beneficial effects:
in order to determine the installation position of the 5G antenna, the invention considers the difference of the limits of different disturbance immunity, and analyzes the disturbance intensity generated by different disturbance sources by combining the limit requirements of the table 2 when determining the installation position of the 5G antenna, thereby determining the accurate installation position of the 5G antenna.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The method disclosed by the embodiment corresponds to the device disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the device part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A method for selecting a site of a 5G antenna suspension position on a shared iron tower is characterized by comprising the following steps:
acquiring electrical parameters of an overhead line and geometric parameters of a tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure;
calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters;
determining a first area according to the power frequency magnetic field intensity at each position and a preset power frequency magnetic field limit value;
calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters;
determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value;
and determining the highest installation point in the second area as the antenna suspension position.
2. The method for addressing the suspension position of the 5G antenna on the shared iron tower according to claim 1, wherein the calculating the power frequency magnetic field strength according to the electrical parameter and the geometric parameter comprises:
determining power frequency current flowing through each section of conductor according to the current of the power transmission line, the radius of the conductor and the splitting number of the conductor;
determining a first distance between the center of the conductor and a point of a space to be subjected to a magnetic field according to the erection height and the tower geometric structure;
and calculating the power frequency magnetic field intensity according to the power frequency current and the distance.
3. The method for addressing the suspension position of the 5G antenna on the shared iron tower according to claim 2, wherein the calculation formula for calculating the power frequency magnetic field strength according to the power frequency current and the first distance is as follows:
wherein, mu0Is a preset magnetic permeability; i iskThe power frequency current is used as the power frequency current; r iskIs the first distance; and B is the power frequency magnetic field intensity.
4. The method for addressing the suspension positions of the 5G antenna on the shared iron tower according to claim 1, wherein the determining the first area according to the power frequency magnetic field strength and the preset power frequency magnetic field limit value at each position comprises:
acquiring the preset power frequency magnetic field limit value;
and determining the area in which the numerical value of the power frequency magnetic field intensity is smaller than the preset power frequency magnetic field limit value as the first area.
5. The method of claim 1, wherein the calculating the radio frequency electromagnetic field strength from the electrical parameter and the geometric parameter comprises:
determining a time domain expression of the corona current according to the current of the power transmission line;
performing Fourier transform on the time domain expression to obtain corona current under different frequency conditions;
determining a second distance between the center of the conductor and a point of a space to be subjected to a magnetic field according to the erection height and the tower geometric structure;
calculating the radio frequency electromagnetic field strength from the corona current and the second distance.
6. The method according to claim 5G antenna suspension position addressing on a shared iron tower, wherein the calculation formula for calculating the radio frequency electromagnetic field strength according to the corona current and the distance is as follows:
wherein, mu0Is a preset magnetic permeability; i isFIs the corona current; r isFIs the second distance; b' is the power frequency magnetic field intensity.
7. The method of claim 1, wherein the determining a second area according to the radio frequency electromagnetic field strength in the first area and a preset radio frequency magnetic field limit comprises:
dividing the frequency band range of the radio frequency electromagnetic field intensity on the first area into a first frequency band threshold value and a second frequency band threshold value;
determining a first limit value of the preset radio frequency magnetic field limit value according to the first frequency band threshold value;
determining a second limit value of the preset radio frequency magnetic field limit value according to the second frequency band threshold value;
and determining an area in which the value of the radio frequency electromagnetic field strength in the first frequency band threshold value is smaller than the first limit value and an area in which the value of the radio frequency electromagnetic field strength in the second frequency band threshold value is smaller than the first limit value as the second area.
8. A5G antenna suspension position addressing system on a shared iron tower is characterized by comprising:
the acquisition module is used for acquiring the electrical parameters of the overhead line and the geometric parameters of the tower; the electrical parameters comprise the current of the power transmission line, the splitting number of the lead and the radius of the lead; the geometric parameters comprise the erection height and the tower geometric structure;
the first calculation module is used for calculating the power frequency magnetic field intensity according to the electrical parameters and the geometric parameters;
the first determining module is used for determining a first area according to the power frequency magnetic field strength at each position and a preset power frequency magnetic field limit value;
the second calculation module is used for calculating the radio frequency electromagnetic field strength according to the electrical parameters and the geometric parameters;
the second determination module is used for determining a second area according to the radio frequency electromagnetic field strength on the first area and a preset radio frequency magnetic field limit value;
and the third determining module is used for determining the highest installation point in the second area as the antenna suspension position.
9. The system of claim 8, wherein the first computing module specifically includes:
the current calculation unit is used for determining the power frequency current flowing through each section of conductor according to the current of the power transmission line, the radius of the conductor and the splitting number of the conductor;
the distance calculation unit is used for determining a first distance between the center of the conductor and a point of a space to-be-solved magnetic field according to the erection height and the tower geometric structure;
and the field intensity calculating unit is used for calculating the power frequency magnetic field intensity according to the power frequency current and the distance.
10. The system of claim 8, wherein the first determining module specifically comprises:
a limit value obtaining unit, configured to obtain the preset power frequency magnetic field limit value;
and the first determining unit is used for determining the area, in which the numerical value of the power frequency magnetic field strength is smaller than the preset power frequency magnetic field limit value, as the first area.
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| CN115412448A (en) * | 2022-08-24 | 2022-11-29 | 中国联合网络通信集团有限公司 | Network equipment security evaluation method, device and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115412448A (en) * | 2022-08-24 | 2022-11-29 | 中国联合网络通信集团有限公司 | Network equipment security evaluation method, device and storage medium |
| CN115412448B (en) * | 2022-08-24 | 2023-11-21 | 中国联合网络通信集团有限公司 | Network equipment security assessment method, device and storage medium |
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