CN115643585A - Mobile network signal coverage blind area calculation method, device, equipment and medium - Google Patents
Mobile network signal coverage blind area calculation method, device, equipment and medium Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment and a medium for calculating a signal coverage blind area of a mobile network, wherein a three-dimensional geometrical body of a signal coverage area of a base station is simulated according to coordinates of the base station and direction data of a transmitted signal; constructing a three-dimensional space model constructed by object city information related to the signal coverage of the base station; searching a building having an intersection relation with the three-dimensional geometric body in the three-dimensional space model; calculating a first geometric body from the three-dimensional geometric body to the surface of the building facing the base station and a second geometric body intersecting the three-dimensional geometric body from the three-dimensional space; and calculating a coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body. The coverage blind area of the mobile network signal can be calculated quickly and accurately.
Description
Technical Field
The invention relates to the technical field of wireless, in particular to a method, a device, equipment and a medium for calculating a signal coverage blind area of a mobile network.
Background
With the development and application of technologies such as mobile internet, internet of things, 5G communication and the like, the requirements for the signal coverage and the signal quality of the mobile network are increasingly increased. In actual production, the surrounding environments of the positions of different base stations are greatly different, and the distribution of objects affecting signal coverage, such as signal shields around the base stations, other wireless signal transmitting facilities and the like, needs to be analyzed in a targeted manner, so as to improve the coverage area of the base stations, improve the signal coverage quality and reduce the signal coverage dead zones of the mobile network. However, at present, the analysis of the coverage blind area of the mobile network signal is mainly obtained based on manual experience or based on field test of related terminal equipment, and the calculation process of the coverage blind area is low in efficiency and low in accuracy.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method, an apparatus, a device and a medium for calculating a coverage blind area of a mobile network signal, which can quickly and accurately calculate the coverage blind area of the mobile network signal.
The embodiment of the invention provides a method for calculating a signal coverage blind area of a mobile network, which comprises the following steps:
simulating a three-dimensional geometrical body of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmitted signal;
constructing a three-dimensional space model constructed by object city information related to signal coverage of the base station;
searching for a building in the three-dimensional space model, wherein the building has an intersection relation with the three-dimensional geometric body;
calculating a first geometric body from the three-dimensional geometric body to the surface of the building facing the base station and a second geometric body intersecting the three-dimensional geometric body from the three-dimensional space;
and calculating a coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body.
Preferably, the direction data comprises: base station sideAngle of orientation theta n Angle of elevation theta u Upper and lower opening angles theta h Right and left opening angles theta v And a quadrangular pyramid height H;
the simulating a three-dimensional geometry of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmission signal specifically comprises:
simulating a transmitting signal of the base station into a quadrangular pyramid, establishing a three-dimensional coordinate system by taking the coordinate of the base station as an original point, taking the height from the base station to the quadrangular pyramid as a z-axis of the three-dimensional coordinate system, and respectively taking the directions of the length and the width of the regular quadrangular ground as the directions of an x-axis and a y-axis;
according to the coordinates P of the base station o (x o ,y o ,z o ) Calculating the upper right point P of the rectangular pyramid bottom surface rt Coordinate (x) rt ,y rt ,z rt )；
According to the symmetrical relation of the rectangular pyramid, calculating the lower left point P of the bottom surface of the rectangular pyramid lb Coordinate (x) lb ,y lb ,z lb ) Lower right point P rb Coordinate (x) rb ,y rb ,z rb ) Upper left point P lt Coordinate (x) lt ,y lt ,z lt )；
According to P o Point map coordinate system coordinates (x, y, z) and direction angle θ n And elevation angle theta u The coordinates of the rectangular pyramid can be converted into the coordinates of a map coordinate system where the three-dimensional geometric body is located by using a three-dimensional matrix algorithm;
generating a geometric body G of a signal coverage area according to the coordinate of the quadrangular pyramid in the map coordinate system;
calculating the geometric part of the obtained geometric body on the ground by using a three-dimensional intersection cutting algorithm, and taking the calculated geometric part as a three-dimensional geometric body Gs;
the model of the three-dimensional intersection cutting algorithm is as follows: ST _3 DInterelection (geometry geom G, geometry geom A), geometry geom G representing geometry G as the first intersecting object, geometry geom A representing the digital elevation model A on the ground as the second intersecting object;
wherein x is rt＝ H*tan(θ v /2)，y rt＝ H*tan(θ h /2)，z rt＝ H；x rb＝ x rt ，y rb＝- y rt ，z rb＝ z rt ；x lb＝- x rt ，y rb＝- y rt ，z rb＝ z rt ；x lt＝- x rt ，y rb＝ y rt ，z rb＝ z rt 。
As a preferred scheme, the process of building the three-dimensional space model specifically includes:
based on a geographic information system technology, a city information model and an information model technology, a three-dimensional space model which comprises a base station, a digital elevation model and city information related to signal coverage is constructed.
Preferably, the searching for the building having an intersection relationship with the three-dimensional geometric body in the three-dimensional space model specifically includes:
utilizing three-dimensional intersection function algorithm to judge whether each building is in contact with three-dimensional geometry G S Intersecting, namely determining a building B in the three-dimensional space model, which has an intersecting relation with the three-dimensional geometric body;
the model of the three-dimensional intersection function algorithm is ST-3 DInterselects (geometry geomG) S ，geometry geom b)，geometry geomG S To form a three-dimensional geometric body G S A first object that is determined to be intersected, and geometry geom b represents a second object building b that is determined to be intersected.
Preferably, the coverage hole is a difference set between the three-dimensional geometric solid and a sum of the first geometric solid and the second geometric solid.
Preferably, the method further comprises:
with the base station as a center, within the range of a left opening angle and a right opening angle, respectively simulating signal rays on the upper side surface and the lower side surface of the rectangular pyramid at a preset first angle interval; within the range of the upper opening angle and the lower opening angle, simulating signal rays on the left side surface and the right side surface of the rectangular pyramid at the first angle interval respectively;
calculating simulated ray and said building facing baseSide B of the station f As a first set of points P { B } fp Calculating the simulated ray and the face B of the building, which faces away from the base station b As a second set of points P { B } bp Calculating the intersection of each ray with the ground as a third set of points P { G } p }；
The point cloud reconstruction, three-dimensional covexhull and wave front surface reconstruction algorithm are adopted to carry out set P { B) on the first points fp A second set of points P { B } bp And a third set of points P { G } p And (5) reconstructing to obtain a reconstructed geometric body, wherein the reconstructed geometric body is a verification blind area of the signal.
Further, the method further comprises:
comparing the verification blind area with the coverage blind area, and judging whether the calculated shape and volume of the verification blind area and the coverage blind area are the same;
when the two are different, judging that the calculation of the coverage blind area is not accurate;
and when the signal coverage area and the signal coverage area are the same, judging that the calculation of the coverage blind area is accurate, and displaying a three-dimensional geometric body of the signal coverage area, a second geometric body of the in-vivo signal coverage area and the signal coverage blind area in a city information model scene in a three-dimensional form by adopting a three-dimensional visualization technology.
The embodiment of the invention also provides a device for calculating the signal coverage blind area of the mobile network, which comprises:
the signal simulation module is used for simulating a three-dimensional geometrical body of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmitted signals;
the three-dimensional simulation module is used for constructing a three-dimensional space model constructed by object city information related to the signal coverage of the base station;
the building calculation module is used for searching a building which has an intersection relation with the three-dimensional geometric body in the three-dimensional space model;
the three-dimensional calculation module is used for calculating a first geometric body from the three-dimensional geometric body to the surface of the building facing the base station and a second geometric body intersecting the three-dimensional geometric body from the three-dimensional space;
and the blind area calculating module is used for calculating the coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body.
As a preferred mode, the direction data includes: base station direction angle theta n Angle of elevation theta u Angle of vertical opening theta h Right and left opening angles theta v And a quadrangular pyramid height H;
the signal simulation module is specifically configured to:
simulating a transmitting signal of the base station into a quadrangular pyramid, establishing a three-dimensional coordinate system by taking the coordinate of the base station as an origin, taking the height from the base station to the quadrangular pyramid as a z-axis of the three-dimensional coordinate system, and respectively taking the directions of the length and the width of the ground with the right square as the directions of an x-axis and a y-axis;
according to the coordinates P of the base station o (x o ,y o ,z o ) Calculating the upper right point P of the rectangular pyramid bottom surface rt Coordinate (x) rt ,y rt ,z rt )；
According to the symmetrical relation of the rectangular pyramid, calculating the left lower point P of the bottom surface of the rectangular pyramid lb Coordinate (x) lb ,y lb ,z lb ) Lower right point P rb Coordinate (x) rb ,y rb ,z rb ) Upper left point P lt Coordinate (x) lt ,y lt ,z lt )；
According to P o Point map coordinate system coordinates (x, y, z) and direction angle θ n And elevation angle theta u The coordinates of the rectangular pyramid can be converted into the coordinates of a map coordinate system where the three-dimensional geometric body is located by using a three-dimensional matrix algorithm;
generating a geometric body G of a signal coverage area according to the coordinate of the quadrangular pyramid in the map coordinate system;
calculating the geometric part of the obtained geometric body on the ground by using a three-dimensional intersection cutting algorithm, and taking the calculated geometric part as a three-dimensional geometric body Gs;
the model of the three-dimensional intersection cutting algorithm is as follows: ST _3 DInterelection (geometry geom G, geometry geom A), geometry geom G representing geometry G as the first intersecting object, geometry geom A representing the digital elevation model A on the ground as the second intersecting object;
wherein x is rt＝ H*tan(θ v /2)，y rt＝ H*tan(θ h /2)，z rt＝ H；x rb＝ x rt ，y rb＝- y rt ，z rb＝ z rt ；x lb＝- x rt ，y rb＝- y rt ，z rb＝ z rt ；x lt＝- x rt ，y rb＝ y rt ，z rb＝ z rt 。
Preferably, the process of constructing the three-dimensional space model by the three-dimensional simulation module specifically includes:
based on a geographic information system technology, a city information model and an information model technology, a three-dimensional space model which comprises a base station, a digital elevation model and city information related to signal coverage is constructed.
Preferably, the building calculation module is specifically configured to:
judging whether each building is connected with the three-dimensional geometric body G or not by utilizing a three-dimensional intersection function algorithm S Intersecting, and determining a building B in the three-dimensional space model, wherein the building B has an intersection relation with the three-dimensional geometric body;
the model of the three-dimensional intersection function algorithm is ST-3 DInterselects (geometry geomG) S ，geometry geom b)，geometry geomG S To form a three-dimensional geometric body G S A first object that is determined to be intersected, and geometry geom b represents a second object building b that is determined to be intersected.
Preferably, the coverage hole is a difference set between the three-dimensional geometric body and a sum of the first geometric body and the second geometric body.
As a preferable mode, the apparatus further includes: a verification blind area calculation module;
the verification blind area calculation module is used for:
simulating signal rays at preset first angle intervals on the upper side surface and the lower side surface of the rectangular pyramid respectively within the range of a left opening angle and a right opening angle by taking the base station as a center; within the range of the upper opening angle and the lower opening angle, simulating signal rays on the left side surface and the right side surface of the rectangular pyramid at the first angle interval respectively;
calculating simulated ray and base station-facing surface B of the building f As a first set of points P { B } fp Calculating the simulated ray and the face B of the building, which faces away from the base station b As a second set of points P { B } bp Calculating the intersection of each ray with the ground as a third set of points P { G } p }；
The point cloud reconstruction, three-dimensional covexhull and wave front surface reconstruction algorithm are adopted to carry out set P { B) on the first points fp A second set of points P { B } bp And a third set of points P { G } p And (6) reconstructing to obtain a reconstructed geometric body, wherein the reconstructed geometric body is a verification blind area of the signal.
Further, the apparatus further comprises: a verification module;
the verification module is specifically configured to:
comparing the verification blind area with the coverage blind area, and judging whether the calculated shapes and volumes of the verification blind area and the coverage blind area are the same;
when the two are different, judging that the calculation of the coverage blind area is not accurate;
and when the signal coverage area and the signal coverage area are the same, judging that the calculation of the coverage blind area is accurate, and displaying a three-dimensional geometric body of the signal coverage area, a second geometric body of the in-vivo signal coverage area and the signal coverage blind area in a city information model scene in a three-dimensional form by adopting a three-dimensional visualization technology.
An embodiment of the present invention further provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor executes the computer program to implement the method for calculating a coverage blind area of a mobile network signal according to any one of the above embodiments.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for calculating a coverage blind area of a mobile network signal according to any one of the above embodiments.
The invention provides a method, a device, equipment and a medium for calculating a signal coverage blind area of a mobile network, wherein a three-dimensional geometrical body of a signal coverage area of a base station is simulated according to coordinates of the base station and direction data of a transmitted signal; constructing a three-dimensional space model constructed by object city information related to signal coverage of the base station; searching for a building in the three-dimensional space model, wherein the building has an intersection relation with the three-dimensional geometric body; calculating a first geometric body from the three-dimensional geometric body to the surface of the building facing the base station and a second geometric body intersecting the three-dimensional geometric body from the three-dimensional space; and calculating a coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body. The coverage blind area of the mobile network signal can be calculated quickly and accurately.
Drawings
Fig. 1 is a schematic flowchart of a method for calculating a coverage blind area of a mobile network signal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional coordinate system provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of a three-dimensional geometry and structure of a building provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a signal coverage hole provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a mobile network signal coverage blind area calculation apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present 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.
Example one
Referring to fig. 1, which is a schematic flow chart of a method for calculating a mobile network signal coverage blind area according to an embodiment of the present invention, the method includes steps S1 to S5;
s1, simulating a three-dimensional geometrical body of a signal coverage area of a base station according to coordinates of the base station and direction data of a transmitted signal;
s2, constructing a three-dimensional space model constructed by object city information related to signal coverage of the base station;
s3, searching a building having an intersection relation with the three-dimensional geometric body in the three-dimensional space model;
s4, calculating a first geometric body from the three-dimensional geometric body to the surface of the building facing the base station and a second geometric body intersecting the building and the three-dimensional geometric body according to the three-dimensional space;
and S5, calculating a coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body.
In the specific implementation of this embodiment, the oromura-hart model is a common radio wave propagation attenuation calculation model in the industry, and the oromura-hart model uses the field intensity median path loss in the metropolitan area of the quasi-flat terrain as a reference, and corrects factors such as different propagation environments and terrain conditions by using correction factors, and the radio wave propagation attenuation calculation formula of the oromura-hart model is as follows:
Lb＝69.55+26.16lgf－13.82lgbh－α(hm)+(44.9－6.55lgbh)lgd；
wherein Lb is a city quasi-smooth terrain radio wave propagation loss median value, the unit is dB, f is a working frequency, the unit is MHz, bh is a base station antenna effective height, the unit is m, hm is a mobile station antenna effective height, the unit is m, d is a distance between a mobile device and a base station, the unit is km, and alpha is a mobile station antenna height factor;
according to an Oncun-Harta model radio wave propagation attenuation calculation formula and domestic urban environment loss test empirical data, the median value of the penetration loss of reinforced concrete in the urban area of a large city is 26dB-28dB, the reference standard of the outdoor covering level of the urban area is-90 dBm, and the influence of visible shielding on signal covering is large.
Therefore, the method defines the covered signal coverage area as the signal coverage blind area and realizes the fast and accurate calculation of the signal coverage blind area;
the calculation process includes simulating a signal coverage area of a base station transmitting signal, constructing a quadrangular pyramid of the signal coverage area as a three-dimensional geometrical body of the base station signal coverage area, and constructing a three-dimensional space model of urban information members such as a terrain, a base station and a building;
performing three-dimensional intersection calculation by simulating the intersection relationship between the three-dimensional geometrical body of the coverage area of the base station signal and buildings around the base station and simulating the digital elevation model of the buildings and the shielding direction of the base station signal by the buildings;
calculating a first geometry of the three-dimensional geometry to a face of the building facing the base station, and a second geometry of the building intersecting the three-dimensional geometry;
and performing three-dimensional calculation on the three-dimensional geometric body, the first geometric body and the second geometric body by using a GIS technology, thereby calculating a signal coverage blind area.
Through GIS related space calculation and three-dimensional data visualization technology, automatic, visual and intelligent identification of network signal coverage blind areas caused by object shielding is realized; the method is used for optimizing the distribution of the base stations and reducing the signal coverage overlapping area, so that the construction cost of the 5G communication base station is saved. Meanwhile, after data and a calculation model are further refined, comprehensive analysis of signal coverage areas, coverage overlapping areas, coverage blind areas and the like of a plurality of base stations can be realized; and by further refining relevant parameters of various objects in the CIM model on the influence of network signal coverage and a more refined BIM model, the analysis and application of the aspects of signal coverage strength, signal quality, signal interference and the like can be further realized.
In another embodiment provided by the present invention, the direction data includes: base station direction angle theta n Angle of elevation theta u Angle of vertical opening theta h Right and left opening angles theta v And a quadrangular pyramid height H;
the simulating a three-dimensional geometry of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmission signal specifically comprises:
simulating a transmitting signal of the base station into a quadrangular pyramid, establishing a three-dimensional coordinate system by taking the coordinate of the base station as an original point, taking the height from the base station to the quadrangular pyramid as a z-axis of the three-dimensional coordinate system, and respectively taking the directions of the length and the width of the regular quadrangular ground as the directions of an x-axis and a y-axis;
according to the coordinates P of the base station o (x o ,y o ,z o ) Calculating the upper right point P of the rectangular pyramid bottom surface rt Coordinate (x) rt ,y rt ,z rt )；
According to the symmetrical relation of the rectangular pyramid, calculating the left lower point P of the bottom surface of the rectangular pyramid lb Coordinate (x) lb ,y lb ,z lb ) Lower right point P rb Coordinate (x) rb ,y rb ,z rb ) Upper left point P lt Coordinate (x) lt ,y lt ,z lt )；
According to P o Point map coordinate system coordinates (x, y, z) and direction angle θ n And elevation angle theta u The coordinates of the rectangular pyramid can be converted into the coordinates of a map coordinate system where the three-dimensional geometric body is located by using a three-dimensional matrix algorithm;
generating a geometric body G of a signal coverage area according to the coordinate of the quadrangular pyramid in the map coordinate system;
calculating the geometric part of the obtained geometric body on the ground by using a three-dimensional intersection cutting algorithm, and taking the calculated geometric part as a three-dimensional geometric body Gs;
the model of the three-dimensional intersection cutting algorithm is as follows: ST _3 DInterelection (geometry geom G, geometry geom A), geometry geom G representing geometry G as the first intersecting object, geometry geom A representing the digital elevation model A on the ground as the second intersecting object;
wherein x is rt＝ H*tan(θ v /2)，y rt＝ H*tan(θ h /2)，z rt＝ H；x rb＝ x rt ，y rb＝- y rt ，z rb＝ z rt ；x lb＝- x rt ，y rb＝- y rt ，z rb＝ z rt ；x lt＝- x rt ，y rb＝ y rt ，z rb＝ z rt 。
In this embodiment, when simulating a signal coverage area of a base station, the direction data that needs to be obtained includes: base station direction angle theta n Angle of elevation θ u Angle of vertical opening theta h Left and right opening angle theta v And a quadrangular pyramid height H;
establishing a three-dimensional coordinate system by taking the coordinates of the base station as an origin, taking the height from the base station to the quadrangular pyramid as a z-axis of the three-dimensional coordinate system, and respectively taking the directions of the length and the width of the ground with the regular four edges as an x-axis direction and a y-axis direction, wherein the directions are as shown in figure 2 and are schematic diagrams of the three-dimensional coordinate system provided by the embodiment of the invention;
according to the base station and the direction angle, recording the bottom left lower point P from the base station to the bottom surface of the rectangular pyramid lb Coordinate (x) lb ,y lb ,z lb ) Lower right point P rb Coordinate (x) rb ,y rb ,z rb ) Upper left point P lt Coordinate (x) lt ,y lt ,z lt ) Upper right point P rt Coordinate (x) rt ,y rt ,z rt ) (ii) a Note P o Perpendicular to the bottom surface, i.e. the height H of the pyramid, the point of intersection being P oh The high H may be calculated from the signal strength.
The coordinates of the vertices of the rectangular pyramid are calculated in a calculation coordinate system. Calculating a point P rt The coordinates of (a): (x) rt ,y rt ,z rt ) According to P rb Point and P rt Point is symmetrical with respect to plane y =0, P lt Point and P rt Point symmetry with respect to plane x =0, then: x is the number of rt＝ H*tan(θ v /2)，y rt＝ H*tan(θ h /2)，z rt＝ H；x rb＝ x rt ，y rb＝ -y rt ，z rb＝ z rt ；x lb＝ -x rt ，y rb＝ -y rt ，z rb＝ z rt ；x lt＝ -x rt ，y rb＝ y rt ，z rb＝ z rt ；
According to P o Point map coordinate system coordinates (x, y, z) and direction angle θ n And elevation angle theta u The coordinates of other four vertexes in a map coordinate system can be calculated by utilizing a three-dimensional matrix algorithm;
according to point P o Coordinates (x) in the map coordinate system o ,y o ,z o )，P lb 、P rb 、P lt 、P rt Generating coordinates of a rectangular pyramid in a map coordinate system at the coordinates and the height H of the three-dimensional coordinate system;
calculating the geometric part of the obtained geometric body on the ground by using a three-dimensional intersection cutting algorithm, and taking the calculated geometric part as a three-dimensional geometric body Gs;
the model of the three-dimensional intersection cutting algorithm is as follows: ST _3 DInterelection (geometry geom G, geometry geom A), geometry geom G representing geometry G as the first intersecting object, geometry geom A representing the digital elevation model A on the ground as the second intersecting object;
and constructing a digital elevation model of a three-dimensional geometrical body of the signal coverage area of the base station above the ground according to the parameters of the base station, and subsequently solving a signal coverage blind area under the existing condition according to the calculated three-dimensional geometrical body.
In another embodiment provided by the present invention, the process of building the three-dimensional space model specifically includes:
based on a geographic information system technology, a city information model and an information model technology, a three-dimensional space model which comprises a base station, a digital elevation model and city information related to signal coverage is constructed.
In the specific implementation of this embodiment, based on the GIS (Geographic Information System), CIM (City Information Modeling) and BIM (Building Information Modeling) technologies, a three-dimensional space model of City Information components such as terrain, base station, and Building is constructed;
and the method is used for calculating the blind area of the signal coverage area by simulating the three-dimensional geometrical body of the signal coverage area of the base station and buildings around the base station.
In another embodiment provided by the present invention, the step S3 specifically includes:
judging whether each building is connected with the three-dimensional geometric body G or not by utilizing a three-dimensional intersection function algorithm S Intersecting, and determining a building B in the three-dimensional space model, wherein the building B has an intersection relation with the three-dimensional geometric body;
the model of the three-dimensional intersection function algorithm is ST-3 DInterselects (geometry geomG) S ，geometry geom b)，geometry geomG S To form a three-dimensional geometric body G S A first object that is determined to be intersected, and geometry geom b represents a second object building b that is determined to be intersected.
In the specific implementation of the embodiment, the three-dimensional geometric solid G of the coverage area of the base station signal is searched by using a three-dimensional intersection function algorithm s Buildings in an intersecting relationship;
judging whether to be matched with a three-dimensional geometric body G in a three-dimensional space model through a three-dimensional intersection function algorithm S Intersecting, if determined by a three-dimensional intersection function, with the three-dimensional geometry G S When intersecting, it is taken as building B;
the model of the three-dimensional intersection function algorithm is ST-3 DInterselects (geometry geomG) S ，geometry geom b)，geometry geomG S To form a three-dimensional geometric body G S A first object which is judged whether to intersect, and geometry geom b represents a second object building b which is judged whether to intersect;
fig. 3 is a schematic structural diagram of a three-dimensional geometric body and a building provided by an embodiment of the invention; calculating the part of the obtained signal coverage area on a ground DEM (Digital Elevation model) through a three-dimensional intersection cutting algorithm, namely a three-dimensional geometric body G s ；
Calculating by a three-dimensional intersection function algorithm to obtain a three-dimensional geometric body G s An intersecting building B;
and defining a signal coverage area shielded by the building as a signal coverage blind area according to the calculated three-dimensional geometric body sum, thereby realizing rapid and accurate signal coverage blind area calculation.
In another embodiment provided by the present invention, the coverage hole is a difference set between the three-dimensional geometric solid and a sum of the first geometric solid and the second geometric solid.
In the specific implementation of the present embodiment, refer to fig. 4, which is a schematic diagram of a signal coverage blind area provided in the embodiment of the present invention;
according to the three-dimensional space, calculating a three-dimensional geometric body G s First geometry G to the base station-facing side of building B sb1 I.e. the signal coverage area not obscured by building B. According to the intersection edge of each surface of the three-dimensional geometric solid and the building and the base station point P o Connecting to generate a new first geometry G sb1 。
Calculating a three-dimensional geometry G of a signal coverage area within a building B sb2 And obtaining a second geometric body G according to the connection of each surface of the three-dimensional geometric body and the intersecting edge of the building sb2 ；
Calculate the three-dimensional geometry G s Third geometry G to the side of building B facing away from the base station sb I.e. signal coverage areas G not obscured by buildings B sb1 And signal coverage area G within building B sb2 Wherein: g sb ＝G sb1 +G sb2 ；
Using portions of signal coverage areas on the ground DEM, i.e. three-dimensional geometries G s Subtract the third geometry G sb The blind area caused by the shielding of the object, namely the coverage blind area G, of the signal coverage can be calculated b ，G b ＝G s -G sb 。
According to the base station signal emission parameters, a three-dimensional geometric body is quickly and efficiently constructed in the CIM system, and according to the three-dimensional space model and three-dimensional calculation, a signal coverage blind area can be efficiently and accurately calculated
In another embodiment provided by the present invention, the method further comprises:
with the base station as a center, within the range of a left opening angle and a right opening angle, respectively simulating signal rays on the upper side surface and the lower side surface of the rectangular pyramid at a preset first angle interval; within the range of the upper opening angle and the lower opening angle, simulating signal rays on the left side surface and the right side surface of the rectangular pyramid at the first angle interval respectively;
calculating simulated ray and base station-facing surface B of the building f As a first set of points P { B } fp Calculating simulated ray and the face B of the building opposite to the base station b As a second set of points P { B } bp Calculating the intersection of each ray with the ground as a third set of points P { G } p }；
Adopting a point cloud reconstruction surface reconstruction, a three-dimensional convexhull and a wave front surface reconstruction algorithm to carry out set P { B } on the first points fp H, a second set of points P { B } bp And a third set of points P { G } p And (6) reconstructing to obtain a reconstructed geometric body, wherein the reconstructed geometric body is a verification blind area of the signal.
In this embodiment, the verification blind area is calculated by the following method:
constructing a three-dimensional space model constructed by object city information related to signal coverage of the base station;
simulating a transmitting signal of the base station into a quadrangular pyramid, establishing a three-dimensional coordinate system by taking the coordinate of the base station as an original point, taking the height from the base station to the quadrangular pyramid as a z-axis of the three-dimensional coordinate system, and respectively taking the directions of the length and the width of the regular quadrangular ground as the directions of an x-axis and a y-axis;
according to the coordinates P of the base station o (x o ,y o ,z o ) Calculating the upper right point P of the rectangular pyramid bottom surface rt Coordinate (x) rt ,y rt ,z rt )；
According to the symmetrical relation of the rectangular pyramid, calculating the left lower point P of the bottom surface of the rectangular pyramid lb Coordinate (x) lb ,y lb ,z lb ) Lower right point P rb Coordinate (x) rb ,y rb ,z rb ) Upper left point P lt Coordinate (x) lt ,y lt ,z lt )；
According to P o Point map coordinatesSystem coordinates (x, y, z) and direction angle θ n And elevation angle theta u The coordinates of the rectangular pyramid can be converted into the coordinates of a map coordinate system in which the three-dimensional geometric body is located by utilizing a three-dimensional matrix algorithm;
generating a geometrical body G of a rectangular pyramid of a signal coverage area according to the coordinates of the rectangular pyramid in the map coordinate system;
in the directions of the upper and lower surfaces of the quadrangular pyramid, at a left and right opening angle theta v In the range of θ v At 500 intervals, constructing analog signal rays on an upper surface and a lower surface respectively; along the directions of the left and right surfaces of the quadrangular pyramid, the vertical opening angle theta h In the range of θ h At the interval of 500, analog signal rays are constructed on the left surface and the right surface respectively.
Let the base station-oriented surface of the building B be B f The north orientation base station is B b Calculating each ray and B f Set of intersections of (a) as a first point set P { B } fp H, ray and B b As a second set of points P { B } bp The intersection point set of the ray and the ground is used as a third point set P { G } p }；
Adopting point cloud reconstruction surface reconstruction, three-dimensional covexhull and wave front surface reconstruction algorithm according to G p And all intersection sets P { G } p ,B fp ,B bp And performing 3D reconstruction to obtain a reconstructed geometric body, namely a verification blind area of the signal coverage blind area.
The calculated verification blind area is used for further verifying the accuracy of the signal coverage blind area, and the accuracy of blind area calculation is guaranteed.
In another embodiment provided by the present invention, the method further comprises:
comparing the verification blind area with the coverage blind area, and judging whether the calculated shapes and volumes of the verification blind area and the coverage blind area are the same;
when the two are different, judging that the calculation of the coverage blind area is not accurate;
and when the signal coverage area and the signal coverage area are the same, judging that the calculation of the coverage blind area is accurate, and displaying a three-dimensional geometric body of the signal coverage area, a second geometric body of the in-vivo signal coverage area and the signal coverage blind area in a city information model scene in a three-dimensional form by adopting a three-dimensional visualization technology.
In this embodiment, the method further includes:
comparing the calculated verification blind area with the calculated coverage blind area, and judging whether the calculated shape and the calculated volume of the verification blind area are the same as those of the coverage blind area;
when the two are different, the calculation of the coverage blind area is judged to be inaccurate, and the coverage blind area and the verification blind area can be recalculated again in a three-dimensional space model technology and a signal ray simulation mode;
and when the signal coverage area and the signal coverage area are the same, judging that the calculation of the coverage blind area is accurate, and displaying a three-dimensional geometric body of the signal coverage area, a second geometric body of the in-vivo signal coverage area and the signal coverage blind area in a city information model scene in a three-dimensional form by adopting a three-dimensional visualization technology.
Under the environments of different base stations and different positions, two algorithms are respectively used for calculation, and the volume and the shape of the result of the two calculation modes are compared, so that the calculation method is fast, accurate, reliable and stable.
In another embodiment provided by the present invention, referring to fig. 5, a schematic structural diagram of a mobile network signal coverage hole calculating apparatus provided by the embodiment of the present invention is shown, where the apparatus includes:
the signal simulation module is used for simulating a three-dimensional geometrical body of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmitted signals;
the three-dimensional simulation module is used for constructing a three-dimensional space model constructed by object city information related to signal coverage of the base station;
a building calculation module, configured to search the three-dimensional space model for a building having an intersection relationship with the three-dimensional geometric object;
the three-dimensional calculation module is used for calculating a first geometric body from the three-dimensional geometric body to the face, facing the base station, of the building and a second geometric body, intersected with the three-dimensional geometric body, of the building according to a three-dimensional space;
and the blind area calculating module is used for calculating the coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body.
The mobile network signal coverage hole calculation apparatus provided in this embodiment can perform all the steps and functions of the mobile network signal coverage hole calculation method provided in any of the above embodiments, and details of the functions of the apparatus are not described herein.
Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device includes: a processor, a memory, and a computer program, such as a mobile network signal coverage hole calculation program, stored in the memory and executable on the processor. When the processor executes the computer program, the steps in each embodiment of the method for calculating a coverage hole of a mobile network signal are implemented, for example, steps S1 to S5 shown in fig. 1. Alternatively, the processor implements the functions of the modules in the above device embodiments when executing the computer program.
Illustratively, the computer program may be partitioned into one or more modules, stored in the memory and executed by the processor, to implement the invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the mobile network signal coverage hole calculation device. For example, the computer program may be divided into a detection module, an output power control module, and a window control module, and specific functions of each module are described in detail in the method for calculating a coverage blind area of a mobile network signal provided in any of the above embodiments, which is not described herein again.
The mobile network signal coverage blind area computing device can be computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The mobile network signal coverage hole calculation device can comprise a processor and a memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of a mobile network signal coverage hole calculation apparatus, and does not constitute a limitation of a mobile network signal coverage hole calculation apparatus, and may include more or less components than those shown, or some components may be combined, or different components, for example, the mobile network signal coverage hole calculation apparatus may further include an input and output device, a network access device, a bus, and the like.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor is a control center of the mobile network signal coverage area calculating device, and various interfaces and lines are used for connecting various parts of the whole mobile network signal coverage area calculating device.
The memory can be used for storing the computer programs and/or modules, and the processor can realize various functions of the mobile network signal coverage dead zone calculation device by operating or executing the computer programs and/or modules stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The module integrated by the mobile network signal coverage dead zone calculation device can be stored in a computer readable storage medium if the module is realized in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, and software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (10)
1. A method for calculating a signal coverage blind area of a mobile network is characterized by comprising the following steps:
simulating a three-dimensional geometrical body of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmitted signal;
constructing a three-dimensional space model constructed by object city information related to signal coverage of the base station;
searching for a building in the three-dimensional space model, wherein the building has an intersection relation with the three-dimensional geometric body;
calculating a first geometric body from the three-dimensional geometric body to the surface of the building facing the base station and a second geometric body intersecting the three-dimensional geometric body from the three-dimensional space;
and calculating a coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body.
2. The method according to claim 1, wherein the direction data comprises: base station direction angle theta n Angle of elevation theta u Angle of vertical opening theta h Left and right opening angle theta v And a quadrangular pyramid height H;
the simulating a three-dimensional geometry of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmission signal specifically comprises:
simulating a transmitting signal of the base station into a quadrangular pyramid, establishing a three-dimensional coordinate system by taking the coordinate of the base station as an origin, taking the height from the base station to the quadrangular pyramid as a z-axis of the three-dimensional coordinate system, and respectively taking the directions of the length and the width of the ground with the right square as the directions of an x-axis and a y-axis;
according to the coordinates P of the base station o (x o ,y o ,z o ) Calculating the upper right point P of the rectangular pyramid bottom surface rt Coordinate (x) rt ,y rt ,z rt )；
According to the symmetrical relation of the rectangular pyramid, calculating the left lower point P of the bottom surface of the rectangular pyramid lb Coordinate (x) lb ,y lb ,z lb ) Lower right point P rb Coordinate (x) rb ,y rb ,z rb ) Upper left point P lt Coordinate (x) lt ,y lt ,z lt )；
According to P o Point map coordinate system coordinates (x, y, z) and direction angle θ n And elevation angle theta u The coordinates of the rectangular pyramid can be converted into the three-dimensional geometric solid by utilizing a three-dimensional matrix algorithmCoordinates in a map coordinate system;
generating a geometric body G of a signal coverage area according to the coordinate of the quadrangular pyramid in the map coordinate system;
calculating the geometric part of the obtained geometric body on the ground by using a three-dimensional intersection cutting algorithm, and taking the calculated geometric part as a three-dimensional geometric body Gs;
the model of the three-dimensional intersection cutting algorithm is as follows: ST — 3 dinterelection (geometry geom G, geometry geom a), where geometry geom G represents the geometry G as the first intersecting object and geometry geom a represents the digital elevation model a on the ground as the second intersecting object;
wherein x is rt ＝H*tan(θ v /2)，y rt ＝H*tan(θ h /2)，z rt ＝H；x rb ＝x rt ，y rb ＝-y rt ，z rb ＝z rt ；x lb ＝-x rt ，y rb ＝ - y rt ，z rb ＝z rt ；x lt ＝ - x rt ，y rb ＝y rt ，z rb ＝z rt 。
3. The method according to claim 1, wherein the process of constructing the three-dimensional space model specifically comprises:
based on a geographic information system technology, a city information model and an information model technology, a three-dimensional space model which comprises a base station, a digital elevation model and city information related to signal coverage is constructed.
4. The method according to claim 1, wherein the searching for the building having an intersection relationship with the three-dimensional geometric object in the three-dimensional space model specifically comprises:
utilizing three-dimensional intersection function algorithm to judge whether each building is in contact with three-dimensional geometry G S Intersection with the three-dimensional geometric body in the three-dimensional space modelA related building B;
the model of the three-dimensional intersection function algorithm is ST-3 DInterselects (geometry geomG) S ，geometry geom b)，geometry geomG S To form a three-dimensional geometric body G S A first object that is determined to be intersected, and geometry geom b represents a second object building b that is determined to be intersected.
5. The method according to claim 1, wherein the coverage hole is a difference set between the three-dimensional geometry and a sum of the first geometry and the second geometry.
6. The method of claim 2, wherein the method further comprises:
with the base station as a center, within the range of a left opening angle and a right opening angle, respectively simulating signal rays on the upper side surface and the lower side surface of the rectangular pyramid at a preset first angle interval; within the range of the upper opening angle and the lower opening angle, simulating signal rays on the left side surface and the right side surface of the rectangular pyramid at the first angle interval respectively;
calculating simulated ray and base station-facing surface B of the building f As a first set of points P { B } fp Calculating simulated ray and the face B of the building opposite to the base station b As a second set of points P { B } bp Calculating the intersection point of each ray and the ground as a third point set P { G } p }；
Adopting a point cloud reconstruction surface reconstruction, a three-dimensional convexhull and a wave front surface reconstruction algorithm to carry out set P { B } on the first points fp A second set of points P { B } bp And a third set of points P { G } p And (6) reconstructing to obtain a reconstructed geometric body, wherein the reconstructed geometric body is a verification blind area of the signal.
7. The method of claim 6, wherein the method further comprises:
comparing the verification blind area with the coverage blind area, and judging whether the calculated shape and volume of the verification blind area and the coverage blind area are the same;
when the two are different, judging that the calculation of the coverage blind area is not accurate;
and when the signal coverage area and the signal coverage area are the same, judging that the calculation of the coverage blind area is accurate, and displaying a three-dimensional geometric body of the signal coverage area, a second geometric body of the in-vivo signal coverage area and the signal coverage blind area in a city information model scene in a three-dimensional form by adopting a three-dimensional visualization technology.
8. A mobile network signal coverage hole calculation apparatus, the apparatus comprising:
the signal simulation module is used for simulating a three-dimensional geometrical body of a signal coverage area of the base station according to the coordinates of the base station and the direction data of the transmitted signals;
the three-dimensional simulation module is used for constructing a three-dimensional space model constructed by object city information related to signal coverage of the base station;
the building calculation module is used for searching a building which has an intersection relation with the three-dimensional geometric body in the three-dimensional space model;
the three-dimensional calculation module is used for calculating a first geometric body from the three-dimensional geometric body to the surface of the building facing the base station and a second geometric body intersecting the three-dimensional geometric body from the three-dimensional space;
and the blind area calculating module is used for calculating the coverage blind area of the mobile network signal according to the three-dimensional geometric body, the first geometric body and the second geometric body.
9. A terminal device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the mobile network signal coverage hole calculation method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program runs, the computer-readable storage medium controls an apparatus to execute the method according to any one of claims 1 to 7.
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