CN114676491B - Method and system for quickly optimizing and determining design height of railway communication iron tower - Google Patents
Method and system for quickly optimizing and determining design height of railway communication iron tower Download PDFInfo
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Abstract
The invention discloses a method and a system for quickly optimizing and determining the design height of a railway communication iron tower, wherein the method comprises the following steps: acquiring a high-precision three-dimensional environment model of a target railway section; projecting coordinates of all three-dimensional surface element central points, signal receiving points and iron tower position points in the three-dimensional environment model to a two-dimensional plane; calculating all signal receiving points in the interval; preliminarily screening a three-dimensional surface element in a two-dimensional plane; judging whether the distance transmission is shielded or not under the three-dimensional environment so as to determine whether the height of the communication iron tower is adjusted or not; when the tower height of the iron tower exceeds a preset value and the full-view distance transmission coverage of the interval still cannot be carried out, the position of the base station needs to be reselected, and after the coordinates of the communication iron tower are adjusted, initialization is set and calculation is carried out again; and completing the calculation, wherein the tower height of the current communication iron tower is the ideal tower height value of the station site. The tower sight distance propagation coverage is predicted with high precision, and the virtual design optimization of the height of the communication tower is realized based on the prediction result.
Description
Technical Field
The invention belongs to the field of digital communication systems special for railways, and particularly relates to a method and a system for quickly optimizing and determining the design height of a railway communication iron tower.
Background
The digital communication system special for railways (hereinafter referred to as a railway special network) in China is mainly used for bearing voice and train control data services and is a core infrastructure for ensuring the running safety of high-speed trains. Under the requirement of a high-speed railway CTC-3 control system, a railway private network needs to ensure the redundant interleaving coverage of wireless signals along the railway, namely under the condition that half of all base stations are shut down, the railway private network wireless system can still ensure the complete wireless signal coverage of all lines. Meanwhile, the railway is a project with huge investment, the matching project of each component is complicated, the wireless system construction project is far more investment than the wireless system device, and the matching projects of wired communication, electric power, building, terrace, slope protection, access roads and the like matched with the wireless base station are much more investment than the wireless system device, so that the use efficiency and the coverage range of a single set of base station device are more needed to be improved, and the number of the wireless base stations along the line is controlled on the premise of ensuring the full-line coverage requirement of the railway.
At present, most of wireless communication antenna feed systems along the railway in China are installed on communication iron towers along the railway, the communication iron towers are mostly in a standard mode, the height is generally increased by integral multiples of 5 meters from 15 meters upwards, the height is generally 20 meters or 30 meters, and ultrahigh towers of 80 meters or more can be used under extreme conditions. The wireless system antenna is arranged on a mounting platform on an iron tower, and is usually positioned 2 meters below the top of the iron tower, so that after the tower height is determined, the mounting height of the antenna is also determined. In the design of a communication system, the height of a communication tower is one of main factors directly influencing the size of the coverage area of a single wireless base station or a repeater, and although in the traditional design, the position of a base station antenna is not required to be capable of completely covering an interval through line-of-sight propagation, the line-of-sight propagation can still be used as an important index for guiding the design of a railway wireless system. Generally, the higher the tower height, the less the possibility that the line-of-sight propagation is blocked, and the larger the signal coverage area without considering the antenna output power. However, since the emergent power of a single set of antenna equipment cannot be increased infinitely, the received signal strength is reduced due to the overhigh tower height, and meanwhile, the construction cost is exponentially increased due to the overhigh height of the communication tower, so that the method has very important value for the optimization design of the height of the communication tower in the actual engineering design.
In a design process, the tower height is comprehensively judged according to the position of a field platform below a communication iron tower and the height of a rail surface under normal conditions, and whether the tower height is reasonable or not is judged through manual field exploration or electronic map display under most conditions. Because the manual evaluation often brings errors, and hundreds of communication towers exist along a 300km railway, the one-by-one discrimination is time-consuming and labor-consuming. Under special conditions (such as mountainous areas, cities with many surrounding high buildings or railway junction areas, etc.), due to complex surrounding environments and serious ground object shielding, the situation that the coverage of wireless signals cannot reach the standard due to the fact that visual distance propagation is shielded by mountains or buildings due to manual discrimination errors is easily caused. After a wireless system is built by using the traditional engineering method, the position of a base station or the height of a tower is adjusted based on a wireless signal coverage test, so that the cost of manpower and material resources can be greatly increased, and the requirement of daily design work cannot be met by the traditional method under the requirement of the current fine design. Along with the development of modern unmanned aerial vehicle technique, this problem is alleviateed relatively, and the way that engineering personnel accessible unmanned aerial vehicle tried to fly measures communication tower's stadia propagation range to before wireless system engineering begins, carry out preliminary aassessment to iron tower design height. However, the method needs to test each work point by unmanned aerial vehicle one by one, and the test process is time-consuming and labor-consuming; meanwhile, the evaluation means still needs the tester to judge the sight distance propagation based on the unmanned aerial vehicle photographing, and because the photos are not completely visualized to display some terrain complex areas including railway hubs, quite high requirements may be provided for the judgment of the tester, the method can effectively evaluate the height of the iron tower in the design stage, but is not an optimal method. The more ideal method is to carry out efficient and accurate simulation calculation and optimization design on the height of the railway full-track tower by using the high-precision three-dimensional map. However, the accurate calculation of the height of the railway communication tower by using the high-precision map faces two problems, namely how to quantify and evaluate the relation between the height of the communication tower and the coverage quality of wireless signals, and how to reduce the influence of huge data volume caused by the high-precision three-dimensional map on the calculation efficiency.
Disclosure of Invention
Aiming at the defects or improvement requirements in the prior art, the invention provides a method and a system for quickly optimizing and determining the design height of a railway communication iron tower.
In order to achieve the above object, according to an aspect of the present invention, the present invention provides a method for determining a design height of a railway communication tower by fast optimization, including:
s1, acquiring a high-precision three-dimensional environment model of the target railway section, and determining a wireless signal receiving point of a railway private network and the position of an iron tower along the line in the model;
s2, projecting coordinates of all three-dimensional surface element central points, signal receiving points and iron tower position points in the three-dimensional environment model to a two-dimensional plane;
s3, starting from one end of an interval close to the position of the iron tower, calculating all signal receiving points in the interval from near to far;
s4 primarily screening three-dimensional surface elements which possibly block the sight distance propagation of signal receiving points in a two-dimensional plane;
s5, judging whether the three-dimensional surface element obtained in S4 blocks the distance transmission in a three-dimensional environment, and accordingly determining whether the height of the communication iron tower is adjusted;
s6, when the tower height of the iron tower exceeds the preset value and the full-view transmission coverage of the interval still can not be carried out, the position of the base station needs to be reselected, after the coordinates of the communication iron tower are adjusted, all the settings are initialized, and the calculation is carried out again;
s7, completing the calculation of all signal receiving points, and determining that the tower height of the communication tower is the ideal tower height value of the site when all the receiving points are in the sight distance transmission range of the communication tower.
Further, the S4 includes the steps of:
s41, connecting the signal receiving point with the position point of the iron tower on a two-dimensional plane, and calculating the distance from the central points of all three-dimensional surface elements on the two-dimensional plane to the connecting line;
and S42, judging whether the calculated distance meets the preset distance requirement, recording all three-dimensional surface elements corresponding to the central points with the distances smaller than a certain preset value, and remapping the recorded surface elements serving as object surface elements possibly blocking the view distance propagation back to the three-dimensional model for processing, thereby realizing the preliminary screening of the three-dimensional surface elements possibly blocking the view distance propagation of the signal receiving point.
Further, the S41 includes: projecting the sight distance transmission shielding process judged under the three-dimensional condition to a two-dimensional plane, reducing the dimension of the three-dimensional array matrix to two dimensions by integral calculation, and simultaneously calculating the distance from the central point of each triangular plane to a transmitting-receiving connecting line only by the following steps:
in the formula: tx is the coordinates of the transmitting point; rx is the coordinate of a receiving point; vy is the coordinate of any vertex of the triangular surface of the model; vp is the coordinate of the central point;
when 0< R <1 indicates that the point is in the middle region of the Tx to Rx line segment, the point-to-line segment distance is calculated by the following formula:
in the formula: tx is the coordinates of the transmitting point; rx is a receiving point coordinate; vy is the coordinate of any vertex of the triangular surface of the model; vp is the coordinate of the central point.
Further, the determining, in the three-dimensional environment, whether the three-dimensional surface element obtained in S4 generates an occlusion on the distance propagation includes:
calculating matrix dot multiplication and division of a single surface, and judging whether the intersection point of the sight distance propagation line and the plane where the model triangular surface is located is in a line segment:
in the formula, Tx is a transmitting point coordinate, Rx is a receiving point coordinate, Vy is a coordinate of any vertex of a triangular surface of the model, and the three coordinates are expressed in a three-dimensional matrix mode;
when 0< R <1 indicates that the point is in the middle region of the Tx to Rx line segment, it is determined whether the three-dimensional bin is occluding the propagation of the visual range, depending on whether the point is within the triangular plane.
Further, the projecting includes: and placing the three-dimensional environment model coordinates under a Cartesian coordinate system, canceling the Z-axis coordinates, and projecting the whole three-dimensional space to an X-Y plane.
Further, the signal receiving points in the step S1 are a series of points uniformly spaced at a certain distance from one end to the other end along the rail 4.5m higher than the rail surface in the railway section; the initial height of the iron tower is 15 meters.
Further, the reselecting of the base station position in step S6 may be performed by manually selecting a plurality of candidate positions in advance, or may be performed by automatically selecting a suitable position through three-dimensional image analysis; after the position is selected, the reasonability of the position selection can be judged by utilizing wireless planning commercial software or a propagation empirical model, wherein the propagation empirical model comprises an Okumura-Hata model, a COST-231 Hata model, a CCIR model, an LEE model or a COST 231 Walfisch-Ikegami model.
According to a second aspect of the present invention, there is provided a system for determining a design height of a railway communication tower through rapid optimization, comprising:
the three-dimensional environment model building module is used for obtaining a high-precision three-dimensional environment model of a target railway section and determining a special network wireless signal receiving point and an iron tower position along a railway in the model;
the coordinate projection module is used for projecting coordinates of all three-dimensional surface element central points, signal receiving points and iron tower position points in the three-dimensional environment model to a two-dimensional plane;
the signal receiving point calculating module is used for calculating all signal receiving points in an interval from near to far from one end of the interval close to the position of the iron tower;
the shielding primary screening module is used for primarily screening a three-dimensional surface element which possibly generates shielding on the sight distance transmission of the signal receiving point in a two-dimensional plane;
the three-dimensional shielding adjustment judging module is used for judging whether the three-dimensional surface element obtained in the step S4 shields the distance transmission in a three-dimensional environment, so that whether the height of the communication iron tower is adjusted is determined;
the initialization module is used for reselecting the position of the base station when the tower height of the iron tower exceeds a preset value and still cannot perform full-view coverage transmission on the interval, and after the coordinates of the communication iron tower are adjusted, all the settings are initialized and then the calculation is performed again;
and the central control module is used for completing the calculation of all signal receiving points by the regulation and control system, determining that all the receiving points are positioned in the sight distance transmission range of the communication iron tower and acquiring an ideal tower height value of the station site.
According to a third aspect of the present invention, there is provided an electronic apparatus comprising:
at least one processor (processor), a communication Interface (Communications Interface), at least one memory (memory), and a communication bus;
the system comprises at least one processor, a communication interface and at least one memory, wherein the at least one processor, the communication interface and the at least one memory complete mutual communication through a communication bus; at least one processor may call logic instructions in at least one memory to perform the method.
According to a fourth aspect of the invention, there is provided a non-transitory computer readable storage medium storing computer instructions which cause the computer to perform the method.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. the method for quickly optimizing and determining the design height of the railway communication iron tower determines the receiving range of the wireless signals of the private network along the railway and the position of the iron tower through the high-precision three-dimensional environment map of the railway, and judges the surface element of the shielding object on the connecting line between the antenna position point on the iron tower and each signal receiving point along the railway. The tower sight distance transmission coverage range is predicted with high precision, and the virtual design optimization of the height of the communication tower is realized based on the prediction result.
2. The invention discloses a method for quickly optimizing and determining the design height of a railway communication iron tower, and provides a method for predicting and accelerating the line-of-sight propagation of a two-dimensional plane synchronous mapping three-dimensional map.
Drawings
FIG. 1 is a flow chart of a method for determining the design height of a railway communication tower through rapid optimization according to the invention;
FIG. 2 is a flow chart of a method for preliminarily screening a three-dimensional surface element which can shield the sight distance transmission of a signal receiving point by a two-dimensional plane;
FIG. 3 is a schematic diagram of a three-dimensional map and a two-dimensional plane for determining a blocking surface element;
FIG. 4 is a flowchart illustrating specific steps of the method for determining the design height of the railway communication tower by fast optimization according to the present invention;
fig. 5 shows an example of a method for synchronously mapping a three-dimensional map on an actual railway scene model and a two-dimensional plane.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, an embodiment of the present invention provides a method for determining a design height of a railway communication tower through fast optimization, including the following steps:
s1, acquiring a high-precision three-dimensional environment model of the target railway section, and determining a special railway network wireless signal receiving point and an iron tower position along the line in the model;
s2, projecting coordinates of all three-dimensional surface element central points, signal receiving points and iron tower position points in the three-dimensional environment model to a two-dimensional plane;
s3, starting from one end of an interval close to the position of the iron tower, calculating all signal receiving points in the interval from near to far;
s4 primarily screening three-dimensional surface elements which possibly block the sight distance propagation of signal receiving points in a two-dimensional plane;
as shown in fig. 2, the specific screening process of step S4 includes the following steps:
s41, connecting the signal receiving point with the position point of the iron tower on a two-dimensional plane, and calculating the distance from the central points of all three-dimensional surface elements on the two-dimensional plane to the connecting line, the concrete steps are as follows:
projecting the process of judging sight distance transmission and shielding under the three-dimensional condition to a two-dimensional plane, reducing the dimension of a three-dimensional array matrix to two dimensions by integral calculation, simultaneously, only calculating the distance from a central point to a transmitting-receiving connecting line of all triangular planes, wherein the calculation process is as shown in (a) in figure 3, and if the coordinate of the central point is Vp, the following steps are carried out:
in the formula, Tx is a transmitting point coordinate, Rx is a receiving point coordinate, and Vy is a coordinate of any vertex of a model triangular surface;
when 0< R <1 indicates that the point is in the middle region of the Tx to Rx line segment, the point-to-line segment distance is calculated by the following formula:
and S42, judging whether the calculated distance meets the preset distance requirement, recording all three-dimensional surface elements corresponding to the central points with the distances smaller than a certain preset value, and remapping the recorded surface elements serving as object surface elements possibly blocking the view distance propagation back to the three-dimensional model for processing, thereby realizing the preliminary screening of the three-dimensional surface elements possibly blocking the view distance propagation of the signal receiving point.
And S5, judging whether the three-dimensional surface element obtained in S4 blocks the distance transmission in a three-dimensional environment, and determining whether to adjust the height of the communication iron tower.
The step of judging whether the three-dimensional surface element obtained in the step S4 blocks the distance propagation in the three-dimensional environment specifically includes:
as shown in fig. 3 (b), first, matrix dot product and division calculation needs to be performed on a single plane, and it is determined whether the intersection point of the view distance propagation line and the plane where the model triangular plane is located is in a line segment:
in the formula, Tx is a transmitting point coordinate, Rx is a receiving point coordinate, Vy is a coordinate of any vertex of a triangular surface of the model, and all three coordinates are expressed in a three-dimensional matrix mode.
When 0< R <1 indicates that the point is in the middle area of the Tx to Rx line segment, it is determined whether the three-dimensional bin is obstructing the propagation of the visual range by determining whether the point is within the triangular plane.
S6, when the tower height of the iron tower exceeds the preset value and still the full-view coverage transmission can not be carried out on the interval, the position of the base station needs to be reselected, after the coordinates of the communication iron tower are adjusted, all the settings are initialized, and the calculation is carried out again.
S7, completing the calculation of all signal receiving points, and determining that the tower height of the communication tower is the ideal tower height value of the site when all the receiving points are in the sight distance transmission range of the communication tower.
Preferably, the signal receiving points in the step S1 are a series of points uniformly spaced at a certain distance from one end to the other end along the rail 4.5m higher than the rail surface in the railway section; the initial height of the iron tower is 15 meters.
Preferably, the projection in step S2 is to place the three-dimensional environment model coordinates under a cartesian coordinate system, cancel the Z-axis coordinates, and project the whole three-dimensional space to the X-Y plane.
Preferably, in step S5, the height of the iron tower is adjusted, and the increase of the height of the iron tower per adjustment is 5 meters.
Preferably, the base station position is reselected in step S6 by manually selecting a plurality of candidate positions in advance, or by analyzing a three-dimensional image, a suitable position is automatically selected; after the position is selected, the reasonability of the position selection can be judged by utilizing wireless planning commercial software or a propagation empirical model, wherein the propagation empirical model comprises an Okumura-Hata model, a COST-231 Hata model, a CCIR model, an LEE model or a COST 231 Walfisch-Ikegami model.
In the three-dimensional environment model, the calculation complexity for judging the sight distance propagation shielding and screening the shielding surface on the two-dimensional projection surface under the three-dimensional condition is different, and the calculation complexity is as follows:
and judging occlusion in a three-dimensional space, wherein each surface in the model triangular surface matrix needs to be independently calculated in view distance propagation occlusion calculation. As shown in (b) of fig. 3, first, a matrix dot product and a division calculation need to be performed on a single plane, and it is determined whether an intersection point of the line of sight distance propagation and a plane where the model triangular plane is located is in a line segment, that is, 0< R <1 in the following formula:
in the formula, Tx is a transmitting point coordinate, Rx is a receiving point coordinate, Vy is a coordinate of any vertex of a triangular surface of the model, and all three coordinates are expressed in a three-dimensional matrix mode. After judging that the intersection point of the sight distance propagation line and the plane is in the line segment, the coordinate of the intersection point can be expressed as
After obtaining the coordinates of the intersection point, we can only determine that the intersection point is on an infinite plane where the model triangular surface is located, and then still need to judge whether the intersection point is within the range of the corresponding triangular surface in a matrix manner, and if the three-dimensional vertexes of the triangular surface are A, B and C, we judge by the following formula:
if U >0, V >0 and U + V <1, the intersection point is in the range of the triangle surface, and the triangle surface is judged to have a shelter for the sight distance propagation. In the entire calculation of a single plane, there are 20 times of three-dimensional matrix multiplication and division, 1 time of three-dimensional matrix addition, 3 times of one-dimensional data multiplication and division, and 4 times of one-dimensional data addition and subtraction, and assuming that the calculation complexity of the multiplication and division and the addition and subtraction is the same and is 1, the calculation complexity of the entire process is 3 × (20 + 1) + (3 + 4) = 70.
When the process is projected to a two-dimensional plane, the overall calculation not only reduces the dimension of the three-dimensional array matrix to two dimensions, but also only calculates the distance from the central point of each triangular plane to the transmitting-receiving connecting line, the calculation process is as shown in (a) in fig. 3, and if the coordinate of the central point is Vp, the following steps are provided:
when 0< R <1 indicates that the point is in the middle area of the line from Tx to Rx, it only needs to calculate whether the distance from the point to the line meets the preset distance requirement:
for the calculation of the center point of a single plane, if there are 5 times of two-dimensional matrix multiplication and division, 2 times of one-dimensional data multiplication and division, and 1 time of one-dimensional data addition and subtraction, the calculation complexity of the whole process is 2 × 5+ (2 + 1) = 13.
It can be easily seen from the above comparison that the visibility range propagation and shielding judgment calculation of a part of planes is carried out by reducing the dimension to a two-dimensional plane, so that the overall calculation complexity can be greatly reduced.
Referring to fig. 4, the operation steps of the embodiment of the present invention are shown, and the following specifically describes the operation steps of the embodiment of the present invention according to the method of the present invention, taking a railway section of a mountain area in hunan province as an example:
step 1, obtaining a high-precision three-dimensional environment model of a target railway section, as shown in (a) of fig. 5, the model is a railway section with an area of 1750 × 400 m, the section is located in a mountain area of Hunan province and is an open railway section between two tunnels. The communication tower is designed to be positioned outside the tunnel portal. The high-precision three-dimensional model is synthesized by taking 5 cm-resolution photographs of different angles in the field by using an oblique photography technique. The three-dimensional model is composed of dense triangular surface elements, and the number of the surface elements of the original model is more than 2 hundred million.
And 2, as shown in (c) of fig. 5, projecting coordinates of center points of all three-dimensional surface elements in the three-dimensional environment model to a two-dimensional plane, and projecting the signal receiving points and the position points of the iron tower to the two-dimensional plane. The projection mode directly places the three-dimensional environment model coordinates under a Cartesian coordinate system, cancels the Z-axis coordinates and projects the whole three-dimensional space to an X-Y plane.
And 3, in the linear building structure of the block rail in (a) in fig. 5, setting signal receiving points as a series of points which are uniformly spaced at a certain distance from one tunnel portal to the other tunnel portal along the rail at a position 4.5m higher than the rail surface in the railway block.
And 4, connecting the signal receiving points with the position points of the iron tower on a two-dimensional plane, calculating the distances from the central points of all three-dimensional surface elements on the two-dimensional plane to the connecting line, recording all three-dimensional surface elements corresponding to the central points with the distances smaller than a certain preset value, and remapping the recorded surface elements as object surface elements which possibly block the apparent distance transmission back to the three-dimensional model for processing. As shown in (d) of fig. 5, when the selected distance is 10 meters, the number of three-dimensional surface elements of the object to be calculated is reduced to 4.4 ten thousand surfaces.
And 5, judging whether all recorded three-dimensional surface elements generate shielding on the sight distance transmission under the three-dimensional environment, and calculating the sight distance transmission shielding condition under the next signal receiving point coordinate until the other end of the interval if the shielding is not found. If the shielding is found, the height of the communication tower needs to be increased, and then the recorded three-dimensional surface element is subjected to shielding judgment again until the sight distance is transmitted without shielding or the tower height exceeds a preset maximum value.
And 6, when the height of the communication iron tower exceeds a preset value or the full-view coverage transmission of the interval cannot be carried out, the iron tower is not located at an ideal position, so that the position of the base station needs to be reselected, after the coordinates of the communication iron tower are adjusted, all the settings are initialized, and the calculation is carried out again.
And 7, when the calculation of all the signal receiving points is completed and all the receiving points are determined to be in the sight distance transmission range of the communication iron tower, the tower height of the current communication iron tower is the ideal tower height value of the station site.
The invention has the beneficial effects that: the tower sight distance transmission coverage range is predicted with high precision, and the virtual design optimization of the height of the communication tower is realized based on the prediction result; the sight distance propagation prediction acceleration calculation method for synchronously mapping the three-dimensional map on the two-dimensional plane is provided, partial calculation in the three-dimensional space is reduced to the two-dimensional plane for calculation in a mapping mode, surface elements which cannot be shielded in a three-dimensional environment model are filtered out in a two-dimensional calculation mode, the calculation amount of three-dimensional calculation is reduced, and the calculation efficiency is effectively improved.
Based on the method of the embodiment, the invention provides a system for quickly optimizing and determining the design height of a railway communication iron tower, which comprises the following steps:
the three-dimensional environment model building module is used for obtaining a high-precision three-dimensional environment model of a target railway section and determining a special network wireless signal receiving point and an iron tower position along a railway in the model;
the coordinate projection module is used for projecting coordinates of all three-dimensional surface element central points, signal receiving points and iron tower position points in the three-dimensional environment model to a two-dimensional plane;
the signal receiving point calculating module is used for calculating all signal receiving points in an interval from near to far from one end of the interval close to the position of the iron tower;
the shielding primary screening module is used for primarily screening a three-dimensional surface element which possibly generates shielding on the sight distance transmission of the signal receiving point in a two-dimensional plane;
the three-dimensional shielding adjustment judging module is used for judging whether the three-dimensional surface element obtained in the step S4 shields the distance transmission in a three-dimensional environment, so that whether the height of the communication iron tower is adjusted is determined;
the initialization module is used for reselecting the position of the base station when the tower height of the iron tower exceeds a preset value and still cannot perform full-view coverage transmission on the interval, and after the coordinates of the communication iron tower are adjusted, all the settings are initialized and then the calculation is performed again;
and the central control module is used for completing the calculation of all signal receiving points by the regulation and control system, determining that all the receiving points are positioned in the sight distance transmission range of the communication iron tower and acquiring an ideal tower height value of the station site.
The method of the embodiment of the invention is realized by depending on the electronic equipment, so that the following description is necessary for the related electronic equipment. With this object in mind, an embodiment of the present invention provides an electronic apparatus including: the system comprises at least one processor (processor), a communication Interface (communication Interface), at least one memory (memory) and a communication bus, wherein the at least one processor, the communication Interface and the at least one memory are communicated with each other through the communication bus. The at least one processor may invoke logic instructions in the at least one memory to perform all or a portion of the steps of the methods provided by the various method embodiments described above.
In addition, the logic instructions in the at least one memory may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the method embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for quickly optimizing and determining the design height of a railway communication iron tower is characterized by comprising the following steps:
s1, acquiring a high-precision three-dimensional environment model of the target railway section, and determining a wireless signal receiving point of a railway private network and the position of an iron tower along the line in the model;
s2, projecting coordinates of all three-dimensional surface element central points, signal receiving points and iron tower position points in the three-dimensional environment model to a two-dimensional plane;
s3, starting from one end of an interval close to the position of the iron tower, calculating all signal receiving points in the interval from near to far;
s4, preliminarily screening three-dimensional surface elements which possibly block the sight distance propagation of signal receiving points in a two-dimensional plane;
s5, judging whether the three-dimensional surface element obtained in S4 blocks the distance transmission in a three-dimensional environment, and accordingly determining whether the height of the communication iron tower is adjusted;
s6, when the tower height of the iron tower exceeds the preset value and the full-view transmission coverage of the interval still can not be carried out, the position of the base station needs to be reselected, after the coordinates of the communication iron tower are adjusted, all the settings are initialized, and the calculation is carried out again;
s7, completing the calculation of all signal receiving points, and determining that the tower height of the communication tower is the ideal tower height value of the site when all the receiving points are in the sight distance transmission range of the communication tower;
the S4 includes the steps of:
s41, connecting the signal receiving point with the position point of the iron tower on a two-dimensional plane, and calculating the distance from the central points of all three-dimensional surface elements on the two-dimensional plane to the connecting line;
and S42, judging whether the calculated distance meets the preset distance requirement, recording all three-dimensional surface elements corresponding to the central points with the distances smaller than a certain preset value, and remapping the recorded surface elements serving as object surface elements possibly blocking the view distance propagation back to the three-dimensional model for processing, thereby realizing the preliminary screening of the three-dimensional surface elements possibly blocking the view distance propagation of the signal receiving point.
2. The method for rapidly optimizing and determining the design height of the railway communication tower according to claim 1, wherein the step S41 comprises the steps of: projecting the sight distance transmission shielding process judged under the three-dimensional condition to a two-dimensional plane, reducing the dimension of the three-dimensional array matrix to two dimensions by integral calculation, and simultaneously calculating the distance from the central point of each triangular plane to a transmitting-receiving connecting line only by the following steps:
in the formula: tx is the coordinates of the transmitting point; rx is a receiving point coordinate; vy is the coordinate of any vertex of the triangular surface of the model; vp is the coordinate of the central point;
when 0< R <1 indicates that the point is in the middle region of the Tx to Rx line segment, the point-to-line segment distance is calculated by the following formula:
in the formula: tx is the coordinates of the transmitting point; rx is a receiving point coordinate; vy is the coordinate of any vertex of the triangular surface of the model; vp is the coordinate of the central point.
3. The method for rapidly optimizing and determining the design height of the railway communication tower according to any one of claims 1-2, wherein the step of judging whether the three-dimensional surface element obtained in the step S4 generates an occlusion on the distance propagation under a three-dimensional environment comprises the following steps:
calculating matrix dot multiplication and division of a single surface, and judging whether the intersection point of the sight distance propagation line and the plane where the model triangular surface is located is in a line segment:
in the formula, Tx is a transmitting point coordinate, Rx is a receiving point coordinate, Vy is a coordinate of any vertex of a triangular surface of the model, and the three coordinates are expressed in a three-dimensional matrix mode;
when 0< R <1 indicates that the point is in the middle region of the Tx to Rx line segment, it is determined whether the three-dimensional bin is occluding the propagation of the visual range, depending on whether the point is within the triangular plane.
4. The method for rapidly optimizing and determining the design height of the railway communication tower according to claim 3, wherein the projecting comprises: and placing the three-dimensional environment model coordinates under a Cartesian coordinate system, canceling the Z-axis coordinates, and projecting the whole three-dimensional space to an X-Y plane.
5. The method for rapidly optimizing and determining the design height of the railway communication tower as claimed in claim 4, wherein the signal receiving points in the step S1 are a series of points uniformly spaced at a certain distance from one end to the other end along the rail 4.5m above the rail surface in the railway section; the initial height of the iron tower is 15 meters.
6. The method for rapidly optimizing and determining the design height of the railway communication tower according to claim 5, wherein the step S6 of reselecting the base station position comprises manually selecting a plurality of alternative positions in advance, or automatically selecting a proper position through three-dimensional image analysis; after the location selection, the wireless planner may use software or a propagation empirical model, including Okumura-Hata model, COST-231 Hata model, CCIR model, LEE model, or COST 231 Walfisch-Ikegami model, to determine the rationality of the location selection.
7. A system for rapidly optimizing and determining the design height of a railway communication tower is characterized by comprising:
the three-dimensional environment model building module is used for obtaining a high-precision three-dimensional environment model of a target railway section and determining a special network wireless signal receiving point and an iron tower position along a railway in the model;
the coordinate projection module is used for projecting coordinates of all three-dimensional surface element central points, signal receiving points and iron tower position points in the three-dimensional environment model to a two-dimensional plane;
the signal receiving point calculating module is used for calculating all signal receiving points in an interval from near to far from one end of the interval close to the position of the iron tower;
the shielding prescreening module is used for preliminarily screening three-dimensional surface elements which possibly shield the sight distance transmission of the signal receiving points in a two-dimensional plane;
the preliminary screening of the three-dimensional surface element which possibly generates the obstruction to the sight distance propagation of the signal receiving point in the two-dimensional plane comprises the following steps: connecting the signal receiving points with iron tower position points on a two-dimensional plane, and calculating the distance from the central points of all three-dimensional surface elements on the two-dimensional plane to the connecting line; after the calculated distance is obtained, whether the distance meets the preset distance requirement is judged, all three-dimensional surface elements corresponding to the central points with the distances smaller than a certain preset value are recorded, the recorded surface elements are re-mapped to a three-dimensional model to be processed as object surface elements which possibly block the view distance transmission, and therefore the three-dimensional surface elements which possibly block the view distance transmission of the signal receiving point are preliminarily screened;
the three-dimensional shielding adjustment judging module is used for judging whether the acquired three-dimensional surface element generates shielding on the distance transmission under a three-dimensional environment so as to determine whether to adjust the height of the communication iron tower;
the initialization module is used for reselecting the position of the base station when the tower height of the iron tower exceeds a preset value and still cannot perform full-view coverage transmission on the interval, and after the coordinates of the communication iron tower are adjusted, all the settings are initialized and then the calculation is performed again;
and the central control module is used for completing the calculation of all signal receiving points by the regulation and control system, determining that all the receiving points are positioned in the sight distance transmission range of the communication iron tower and acquiring an ideal tower height value of the station site.
8. An electronic device, comprising:
at least one processor, a communication interface, at least one memory, and a communication bus;
the system comprises at least one processor, a communication interface and at least one memory, wherein the at least one processor, the communication interface and the at least one memory are used for completing mutual communication through a communication bus; at least one processor may invoke logic instructions in at least one memory to perform the method of any of claims 1 to 2.
9. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 2.
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