CN111683388A - Near-field radiation attenuation test method and three-dimensional display system - Google Patents
Near-field radiation attenuation test method and three-dimensional display system Download PDFInfo
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Abstract
The invention provides a near-field radiation attenuation test method and a near-field radiation attenuation test device, which utilize a unique geographic large scene three-dimensional visualization technology of a three-dimensional geographic information system, fuse satellite image base map and elevation model data, establish a virtual digital earth display platform, simultaneously configure a radio wave propagation radiation attenuation calculation result three-dimensional visualization scheme, perform three-dimensional visualization display on the virtual digital earth platform in a visual, attractive, easily-distinguished and measurable mode through geographic position mapping, integrate national elevation model data and earth surface coverage data, and utilize an efficient data query engine to provide data support for radio wave propagation radiation attenuation calculation; various data calling interfaces are unified, standardized access of an external radiation attenuation scientific calculation module is achieved, and a unified radio wave transmission radiation attenuation calculation platform is established.
Description
Technical Field
The invention belongs to the technical field of radio frequency radiation testing, and particularly relates to a near-field radiation attenuation testing method and device.
Background
The electric wave propagation is always one of the most widely concerned and researched directions in the field of engineering electromagnetic field theory and environmental electromagnetic characteristic research. Since the characteristics of the earth surface are very complex, it is a problem of the propagation of the electric wave on the earth surface in a complex environment, and the propagation of the electric wave on the earth surface shows different propagation mechanisms such as reflection, refraction, diffraction, transmission and scattering when the electric wave propagates in various earth surface forms such as sea surface, lake (river) surface, dry ground, wet ground and rugged topography such as mountains, plains, hills and tall buildings. Since these mechanisms occur with great randomness, it is very difficult to accurately predict the propagation characteristics of the radio waves in a complex environment.
Fig. 1 shows a block diagram of an automatic effective radiation power test system. However, with the rapid development of high frequency electromagnetic wave technology, the prediction of radio wave propagation characteristics in complex environments has become an important research topic. When a plurality of military radio systems such as radar early warning, electronic warfare, command automation and the like are constructed, on one hand, accurate battlefield electromagnetic environment data are indispensable contents, which needs to carry out deep research on a radio wave propagation mechanism and establish a radio wave propagation prediction model based on digital terrain data; on the other hand, the expression form of electromagnetic environment data is also very important, and the traditional two-dimensional map expression form is difficult to meet the three-dimensional space visualization requirement, so that a new data visualization means is needed.
Chinese patent publication CN111355544A discloses a method and a device for predicting urban environment electric wave paths, wherein the method comprises the steps of obtaining effective building and geographic entity information from a three-dimensional urban model constructed based on a geographic information system and a building information model; acquiring electromagnetic parameters, representing the electromagnetic parameters, effective buildings and geographic entity information by a specific data structure, and constructing a three-dimensional electromagnetic city model; according to the parameters of a transceiver, the electromagnetic wave propagation principle and the sparse characteristic of a multipath channel, combining electromagnetic parameters, effective buildings and electromagnetic waves with the main function of geographic entity information prediction, calculating to obtain a telex sparse matrix; and predicting the received signal information of each position point in the target prediction scene according to the telex sparse matrix.
Chinese patent publication CN111355546A discloses a three-dimensional visualization method of radio wave propagation, the method comprising: acquiring physical information of an object in a propagation environment of radio waves; establishing a three-dimensional virtual model of the propagation environment based on the physical information, and determining position coordinates of the object in the three-dimensional virtual model; determining a propagation path of the radio wave based on a signal transmission point of the radio wave, a signal reception point of the radio wave, and position coordinates of the object in the three-dimensional virtual model; determining the electric field intensity and the phase corresponding to the propagation path based on the electric field intensity and the phase corresponding to the signal sending point and the coordinates of the target position in the propagation path; establishing a three-dimensional virtual model of the propagation path based on the propagation path and the corresponding electric field intensity and phase thereof; displaying the three-dimensional virtual model of the propagation path in the three-dimensional virtual model of the propagation environment.
In summary, no method and apparatus for integrating national elevation model data and surface coverage data and providing data support for radio wave propagation radiation attenuation calculation by using an efficient data query engine based on a three-dimensional geographic information platform technology through powerful data management and data analysis functions of a geographic information system have been provided in the prior art.
Disclosure of Invention
In order to solve the technical problem, the invention provides a three-dimensional display system for near-field radiation attenuation test, which is characterized in that: the system comprises: the geographic data updating tool module is responsible for downloading the latest map data from the map data downloader and updating each item of corresponding data stored in the basic geographic information database, the digital earth surface model database and the high-resolution image database; the three-dimensional visualization module extracts data of the basic geographic information database, the digital earth surface model database, the high-resolution image database and the instrument equipment three-dimensional model database to generate a three-dimensional topographic map and a radiation propagation map for display; the data management module manages a radio wave propagation model database, an instrument information database and an out-of-band spurious radiation database; a terrain analysis module; generating elevation forming data of the equipment to be tested according to the input position data of the equipment to be tested and data of a basic geographic information database, a digital earth surface model database and a high-resolution image database; the far-field radiation power measurement module generates a far-field estimation measurement result according to the radio wave propagation model database, the instrument and equipment information database and the input position elevation of the equipment to be measured; the near-field stray measurement module generates an intensity analysis measurement result according to the instrument equipment information database, the out-of-band stray radiation database and the input position elevation of the equipment to be measured; and the measurement results are also input into the three-dimensional visualization module for displaying.
Preferably, the system comprises a computer and hypergraph three-dimensional geographic information system software, and spatial information can be input, stored, edited, inquired, analyzed and simulated.
Preferably, the system can display a topographic map by taking a three-dimensional digital map as a background, and the digital map has three-dimensional functions of zooming in, zooming out and roaming; the system has the functions of automatic map updating, recognition and loading.
Preferably, the system can set and display parameters of the measuring equipment on a digital map; the antenna parameters (including antenna type, radiation azimuth angle and height) of the equipment to be measured and the measuring equipment can be manually set and displayed on a digital map; the parameters of the equipment to be tested can be stored as templates, default values are automatically loaded when the equipment to be tested is used again, and the templates can also be manually selected; and automatically acquiring the position information of the equipment to be measured and the measuring equipment.
Preferably, the antenna parameters include antenna type, radiation azimuth angle, and height; the main parameters of the device to be measured and the device to be measured in transmitting power are manually set, and the parameters include frequency, bandwidth, radiation pattern and power.
The present invention also provides a method for near field radiation attenuation testing using the three dimensional display system for near field radiation attenuation testing of claim 1, characterized in that the method comprises the steps of:
step one, setting parameters
1.1 setting transmitting and receiving antenna parameters, including transmitting frequency, transmitting antenna elevation angle, transmitting antenna elevation, transmitting antenna position, transmitting antenna direction, transmitting antenna polarization mode, receiving antenna elevation and antenna main lobe range;
1.2 the position of the transmitting point is obtained by external GPS equipment or specified on a three-dimensional earth;
1.3 setting calculation parameters of a system, including angle calculation interval, main lobe calculation distance, side lobe calculation distance and atmospheric refractive index;
step two, a calculating step,
2.1, generating a propagation path according to the input parameters, the main lobe and side lobe angle range, the given angle interval and the calculated distance;
2.2, extracting a topographic profile, surface coverage type data and antenna parameters of a propagation path from a database, and inputting the topographic profile, the surface coverage type data and the antenna parameters into a WAPE radio wave propagation model for calculation to obtain attenuation value sets of different propagation paths;
2.21 judging whether to calculate a main lobe and a side lobe, when the main lobe is required to be calculated, calculating the distance according to the angle calculation interval and the main lobe range value of the antenna main lobe, and generating rays, wherein each angle corresponds to one ray;
2.22 when the side lobe is required to be calculated, calculating the distance of the angle outside the range of the main lobe of the antenna according to the angle calculation interval and the side lobe, and generating a plurality of rays;
2.3, taking points of each ray according to the sampling interval corresponding to the main lobe or the side lobe to obtain a series of three-dimensional coordinate points to form a topographic profile corresponding to the ray;
and 2.4, introducing parameters such as antenna parameters, terrain profiles and the like into a radiation calculation model, and calculating attenuation values corresponding to each sampling point.
Step three, visualizing the calculation result,
3.1 rasterizing attenuation value values corresponding to the sampling points, and then realizing the whole visualization of the region of the selected region in the form of raster data;
3.11 calculating the boundary graph of the area of the selected area and the maximum external rectangle of the graph according to the coordinates of the sampling calculation points;
3.12 splitting the circumscribed rectangle into small grids, and then converting the small grids into images, wherein each small grid corresponds to a pixel, and the pixel value is a radiation attenuation value obtained by interpolating the central points of the grids;
3.13 geographic registration of the image to match the real calculation of the area;
3.14 calculating the boundary graph of the area to crop the registered image to obtain a cropped image which is completely matched with the calculated area graph;
3.15 according to the size of each pixel value in the image, establishing a color palette to generate a color image.
Preferably, the antenna parameters include frequency, elevation angle, polarization mode, and atmospheric refractive index; the width of the small grid of the external rectangle is 5 meters by 5 meters.
The invention has the advantages that: (1) based on a three-dimensional geographic information platform technology, national elevation model data and earth surface coverage data are integrated through powerful data management and data analysis functions of a geographic information system, and a high-efficiency data query engine is utilized to provide data support for radio wave propagation radiation attenuation calculation. (2) Various data calling interfaces are unified, standardized access of an external radiation attenuation scientific calculation module is achieved, and a unified radio wave transmission radiation attenuation calculation platform is established. (3) A virtual digital earth display platform is established by utilizing a unique geographic large scene three-dimensional visualization technology of a three-dimensional geographic information system and fusing satellite image base map and elevation model data, and meanwhile, a radio wave propagation radiation attenuation calculation result three-dimensional visualization scheme is configured, so that three-dimensional visualization display is carried out on the virtual digital earth platform in a visual, attractive, easily-distinguished and measurable mode through geographic position mapping.
Drawings
FIG. 1 is a block diagram of an automatic effective radiation power test system;
FIG. 2 is a system architecture of a near-field radiation attenuation testing apparatus according to the present invention;
FIG. 3 is a calculation of the attenuation of electric waves in the radiation area;
FIG. 4 is a point-to-point radio wave radiation attenuation calculation;
FIG. 5 is a radiation region attenuation visualization;
fig. 6 is a single propagation path attenuation curve.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The electromagnetic interference metering test software of the communication countermeasure equipment is one part of the whole system, and the electromagnetic interference metering test function of the communication countermeasure equipment requires that:
1) establishing an out-of-band stray electromagnetic radiation database, wherein common data of electromagnetic radiation comprise: operating frequency, bandwidth, radiation level (power), second harmonic level, third harmonic level, spurious average level, etc. Establishing a database by using an access, wherein the database is mainly used for equipment data retrieval and test record storage;
2) analyzing the out-of-band stray intensity;
3) the radiation affects a range of location areas.
Development platform and operating environment
ArcLobe is selected as a three-dimensional geographic information basic development platform, and an ArcObjects component type GIS development mode is adopted. The component type GIS development mode combines the advantages of GIS platform software and the component development mode of a visual development platform, is easy to realize seamless integration with a service system, and is the most mainstream GIS application development mode at present. A GIS application system is developed by applying a component technology, a mainstream WinForm program development language such as C # is generally used for design on a user interface level, the GIS components can be directly called for realization through spatial data management and visualization, and other functions can also use corresponding components.
The control mainly used by the invention is a spherical control GlobeControl which provides operations such as drawing for a user based on ArcClobe function, and the GlobeControl displays a 3D view, can provide a position of global representation and is based on 3D data. GlobeControl is also a single development process and provides coarse-grained ArcObjects component objects, as well as powerful texture-rendered ArcObjects components, which operate IGlobe views through an object interface, which may operate arclobe applications through iglobebeviwer objects, which contain a GlobeDisplay and a GlobeDisplay containing a Globe, which provides frequently used properties and methods, such as: GlobeControl has globeconamera, Globe, GlobeDisplay, and GlobeViewer attributes, which also can perform methods or tasks, such as: GlobeControl, which is the most basic control for three-dimensional development because it provides a user interface, has a Load3dFile method to import globe documents.
II, technical indexes are as follows:
the calculation method is used for calculating the propagation attenuation of the troposphere electric wave in the VHF-UHF frequency band in the irregular terrain environment.
1) Frequency range: 40MHz-6 GHz;
2) polarization mode: horizontal and vertical polarization;
3) no more than 30 atmospheric refractive index profiles in the path can be processed; each profile contains no more than 300 pairs of height-index data;
4) can treat surface types including seawater, fresh water, wetland, medium dry land, dry land and customized dielectric constant and conductivity;
5) the receiving and transmitting antenna can be in omnidirectional, Gaussian, sine or custom directional diagram types;
6) point-to-point propagation attenuation is mainly calculated, and the maximum calculated radio wave propagation elevation angle is generally not more than 15 degrees;
7) in a short distance range of more than 15 degrees, a double-ray model, a single-edged peak model and a multi-obstacle diffraction model can be adopted according to the terrain elevation characteristics.
The three-dimensional Geographic Information System (GIS) is a miniature image of resources and environments of the whole earth or partial regions in a computer, and is a technical System for inputting, storing, retrieving, displaying and comprehensively analyzing and applying in a certain format under the support of computer software and hardware.
The geographic information three-dimensional visualization system is a computer system for inputting, storing, editing, inquiring spatial analysis and simulation of spatial information with three-dimensional geographic reference coordinates. The essential difference between a two-dimensional geographic information system and a three-dimensional geographic information system is the distribution range of data, in which elevation is regarded as spatial data or attribute data. The underlying goal of three-dimensional GIS is the three-dimensional representation of multi-dimensional spatio-temporal phenomena. Compared with two-dimensional GIs, three-dimensional GIs has a remarkable feature:
the invention uses a domestic extrahypergraph three-dimensional GIS platform, hypergraph software integrates three-dimensional technologies such as oblique photography, BIM, laser point cloud and the like, integrates IT new technologies such as WebGL, VR, 3D printing and the like, and establishes a new generation of three-dimensional GIS technical system.
The invention aims at three-dimensional GIS application, mainly has two directions, one is terrain analysis and mainly serves for an electric wave transmission model algorithm, and the other is three-dimensional visualization and is mainly used for displaying measurement results. The hypergraph two-dimensional and three-dimensional integrated platform can better meet the requirements, provides a component type development mode, can be better combined with other service systems, and can be perfectly embedded with an electric wave transmission model algorithm.
Thirdly, the function of the near-field stray measurement system,
the display of a digital map is carried out,
1) the developed software takes a three-dimensional digital map as a background;
2) the digital map has three-dimensional display, magnification, reduction and roaming functions;
3) the software can be independently operated without a network;
4) the map automatic updating, identifying and loading functions are achieved.
3.1 the software can automatically read the power value of the field strength meter/spectrum analyzer.
And 3.2, setting and displaying parameters of the measuring equipment on a digital map.
1) The antenna parameters (including antenna type, radiation azimuth angle and height) of the equipment to be measured and the measuring equipment can be manually set and displayed on a digital map;
2) the parameters of the equipment to be tested can be stored as templates, the software automatically loads default values, and the templates can also be manually selected. For example, the template 1 is named as an ultrashort wave radiation station, a type log periodic antenna, the maximum antenna erection height is 15 meters, the radiation azimuth angle is 45 degrees, and the beam width is 60 degrees;
3) the main parameters of the equipment to be measured and the emission power of the measurement equipment can be manually set, such as frequency, bandwidth, radiation pattern, power and the like;
4) the position information of the equipment to be measured and the measuring equipment is automatically obtained, and the positioning precision is within 5 meters;
5) when various tests (including accurate measurement by contrast method and far-field estimation measurement) are carried out, the test conditions (parameters) and the reading of the instrument can be automatically stored in a table with a specified format, and the query can be opened at any time when needed.
3.3, drawing a radiation area and a self-interference area of the radiation equipment on a digital map according to a radiation electric wave transmission attenuation model and an algorithm;
1) constructing a radio wave propagation prediction model based on a Geographic Information System (GIS);
2) according to the actual terrain in the transmission process obtained by the digital map, a deterministic transmission prediction model algorithm based on direct incidence, reflection and diffraction is provided;
3) setting working parameters of radiation equipment, an antenna and the like on a digital map, and drawing a radiation area and a self-interference area of the radiation equipment;
4) and clicking on the digital map to check the electric wave field intensity value of the point of interest.
3.4 according to the radiation signal emitted by the standard radiation source, remotely measuring the received radiation power, and according to the measurement result, plotting a radiation area and a self-interference area on a map;
1) specifying a radiation device arrangement place, and plotting on a digital map;
2) importing measurement data;
3) according to the measurement data, a radiation area and a self-disturbance area are plotted on a map.
3.5 correcting relevant parameters of the electric wave transmission attenuation model and the algorithm by comparing errors of the actually measured and theoretically calculated radiation area and self-interference area and self-supporting learning so as to meet the error requirement;
1) the correctness of the deterministic model algorithm is verified by comparing the data measured by the empirical model;
2) through the study of the measured data, the theoretical module and the algorithm are continuously corrected and perfected, and the unification of theory and practice is achieved.
3.6 according to the radiation electric wave transmission attenuation model, according to the radiation signal intensity of the receiving point, the real radiation power of the appointed radiation equipment is reversely deduced and plotted.
3.7 minimum effective radiated power calculation.
The receiving and sending parameters of the blue radio station can be manually set, and include the power of the radio station, the lowest radiation level, the antenna gain and the interference-signal ratio, and the minimum power for effectively radiating the blue radio station is automatically calculated.
3.8 automatic data storage, editing, query, export and other functions
3.9 of the software modules,
1) a digital earth platform;
2) geographic information data (terrain, elevation);
3) a digital map three-dimensional dynamic display module;
4) scene (scenario) setting and display software modules;
5) an instrument control and data reading software module;
6) an antenna azimuth, pitch, square line directional diagram (gain) setting and controlling module;
7) a data and device information management software module;
8) a radio wave propagation model library and a management software module;
9) a radio propagation model correction (data processing) software module;
10) the system manages (edits, imports, exports) the software modules.
Fourth, system architecture
FIG. 2 is a system block diagram of a three-dimensional display system for near-field radiation attenuation testing in accordance with the present invention; the system comprises: the geographic data updating tool module is responsible for downloading the latest map data from the map data downloader and updating each item of corresponding data stored in the basic geographic information database, the digital earth surface model database and the high-resolution image database; the three-dimensional visualization module extracts data of the basic geographic information database, the digital earth surface model database, the high-resolution image database and the instrument equipment three-dimensional model database to generate a three-dimensional topographic map and a radiation propagation map for display; the data management module manages a radio wave propagation model database, an instrument information database and an out-of-band spurious radiation database; a terrain analysis module; generating elevation forming data of the equipment to be tested according to the input position data of the equipment to be tested and data of a basic geographic information database, a digital earth surface model database and a high-resolution image database; the high resolution image data is obtained from, for example, Google map or other similar high resolution
Map image data downloaded from the map image library. The far-field radiation power measurement module generates a far-field estimation measurement result according to the radio wave propagation model database, the instrument and equipment information database and the input position elevation of the equipment to be measured; the near-field stray measurement module generates an intensity analysis measurement result according to the instrument equipment information database, the out-of-band stray radiation database and the input position elevation of the equipment to be measured; and the measurement results are also input into the three-dimensional visualization module for displaying.
4.1 the way in which the data is organized,
1) radio wave propagation model database: sqlite;
2) out-of-band spurious emission database: sqlite;
3) instrument device information database: sqlite;
4) digital earth model database: TIF format raster data file + terrain cache file;
5) satellite image: TIF format raster data file + image cache file;
6) basic geographic information data: an Shp format vector file;
7) instrument three-dimensional model database: and (4) an OBJ format three-dimensional model file.
4.2 the main functions of the device are as follows,
4.2.1 the function of map browsing,
1) loading and displaying a digital earth surface model and satellite image data;
2) loading and displaying vector map data;
3) loading and displaying a three-dimensional equipment model, and customizing the position of equipment;
4) map zooming in, zooming out, and roaming;
5) map three-dimensional measurement including distance, angle and area;
6) and (4) picking up three-dimensional coordinates of any point.
4.2.2 device parameter setting, querying and displaying,
1) setting and displaying the parameters of the equipment antenna;
2) setting and displaying the device transmitting power parameter;
3) inquiring and displaying test data;
4) a line graph of the estimated value and the measured value;
5) and storing the template of the equipment parameters.
4.2.3 the topographic analysis is carried out,
1) extracting an elevation section according to the starting point and the end point, and customizing a sampling interval;
2) extracting elevation points according to the space range, and customizing a sampling interval;
3) acquiring the highest point and the lowest point in a specified range;
4) and extracting the water area intersected with the connecting line of the starting point and the end point according to the starting point and the end point.
4.2.4 the map is plotted,
1) radiation device placement location plotting;
2) the radiation area of the radiation equipment is plotted with the self-interference area;
3) plotting the electric wave field strength value of the attention point;
4) radiometric data plotting;
5) radiation-affected location area range plots.
Fifthly, the main functions are as follows,
1. and loading and browsing three-dimensional map data, wherein the three-dimensional map comprises the components of images and terrains.
In the aspect of images, the software adopts Google satellite image tiles and sky and earth map elements to mark tile data, the two types of data can be downloaded through a common map data downloader (such as a water channel universal map downloader, a 91 guardian assistant and the like) and exported into an ArcServer offline tile format, and GlobeControl can directly load the ArcServer offline tiles and has very high display efficiency.
In the first embodiment, near-field radiation area calculation and electric wave attenuation calculation of the radiation area in fig. 3 are performed.
The specific implementation process is as follows:
and setting parameters of a transmitting antenna and a receiving antenna, such as transmitting frequency, transmitting antenna elevation angle, transmitting antenna elevation, transmitting antenna position, transmitting antenna direction, transmitting antenna polarization mode, receiving antenna elevation and antenna main lobe range, wherein the transmitting point position can be acquired by external GPS equipment or specified on the three-dimensional earth.
And setting calculation parameters such as angle calculation interval, main lobe calculation distance, side lobe calculation distance, atmospheric refractive index and the like.
And the calculation software automatically generates a propagation path according to the angle range of the main lobe and the side lobe and the given angle interval and calculation distance, then extracts the topographic profile and the earth surface coverage type data of the propagation path from DEM data, and transmits the topographic profile and the earth surface coverage type data into a Wide Angle PE (WAPE)) radio wave propagation model for calculation together with various antenna parameters to obtain the attenuation value sets of different propagation paths.
The first step is as follows: judging whether to calculate a main lobe and a side lobe, if the main lobe needs to be calculated, calculating the interval and the main lobe distance according to the angle of the range value of the main lobe of the antenna, generating rays, wherein each angle corresponds to one ray, and in the same way, if the side lobe needs to be calculated, calculating the interval and the side lobe distance of angles outside the range of the main lobe of the antenna according to the angle, and generating a plurality of rays.
The second step is that: and (3) taking points of each ray at the DEM according to the sampling interval corresponding to the main lobe or the side lobe to obtain a series of three-dimensional coordinate points so as to form a topographic profile corresponding to the ray.
The third step: introducing antenna parameters (frequency, elevation angle, polarization mode and the like, atmospheric refractive index parameters) and parameters such as terrain profile and the like into a radiation calculation model, and calculating attenuation values corresponding to each sampling point.
In the second embodiment, point-to-point radiation attenuation calculation, fig. 4 point-to-point radio wave radiation attenuation calculation.
The point-to-point radiation attenuation calculation is implemented in a similar manner to the radiation area attenuation calculation, except that the point-to-point radiation attenuation calculation only needs to calculate one propagation path, and the propagation path can be given in two ways: the first is to directly specify the transmission point and reception point positions, and the other is to specify the transmission point position, propagation path direction, and distance.
The basic process is the same as above, except that only one ray is computed here.
In the third embodiment, the result of the calculation is visualized,
fig. 5 shows a radiation region attenuation visualization, and the computed result visualization includes two aspects:
firstly, to the whole visual condition of decay of radiation area, this is also a big difficult point of this software, because the attenuation value of calculating usually has millions, if according to conventional practice, need constitute the isosurface with millions of points and recolor, the calculated amount is very huge, the figure volume basis three-dimensional GIS platform that generates simultaneously also can not bear the weight of, for solving this difficult problem, this software creatively carries out the rasterization with the dot numerical value, then realizes regional whole visual display speed and efficiency with the form of raster data and has had qualitative promotion.
The first step is as follows: the software will calculate the boundary pattern of the calculation area and the maximum bounding rectangle of the pattern according to the coordinates of the sampling calculation points.
The second step is that: the software splits the external rectangle into small grids of 5m by 5m, then converts the grids into images, each small grid corresponds to a pixel, and the pixel value is a radiation attenuation value obtained by interpolating the grid central point.
The third step: the images are geo-registered to match the real computed area.
The fourth step: and utilizing the boundary graph of the calculation area to cut the registered image to obtain a cut image which is completely matched with the graph of the calculation area.
The fifth step: and establishing a color palette according to the value of each pixel in the image to generate a color image.
The display speed and efficiency are improved qualitatively.
Another aspect is the visualization of the attenuation curve of a single propagation path, typically shown in cross-section, in this manner, as well as the software, synchronized with a three-dimensional map, as shown in fig. 6.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting, and although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A three-dimensional display system for near-field radiation attenuation testing, characterized by: the system comprises: the geographic data updating tool module is responsible for downloading the latest map data from the map data downloader and updating each item of corresponding data stored in the basic geographic information database, the digital earth surface model database and the high-resolution image database; the three-dimensional visualization module extracts data of the basic geographic information database, the digital earth surface model database, the high-resolution image database and the instrument equipment three-dimensional model database to generate a three-dimensional topographic map and a radiation propagation map for display; the data management module manages a radio wave propagation model database, an instrument information database and an out-of-band spurious radiation database; a terrain analysis module; the system comprises a data base, a digital earth surface model database, a high-resolution image database, a data acquisition module, a data analysis module and a data analysis module, wherein the data base is used for acquiring the position data of the equipment to be tested and the data of the basic geographic information database, the digital earth surface model database and the high-resolution image database; the far-field radiation power measurement module generates a far-field estimation measurement result according to the radio wave propagation model database, the instrument and equipment information database and the input position elevation of the equipment to be measured; the near-field stray measurement module generates an intensity analysis measurement result according to the instrument equipment information database, the out-of-band stray radiation database and the input position elevation of the equipment to be measured; the measurement results are also input to the three-dimensional visualization module for display.
2. The three-dimensional display system for near-field radiation attenuation testing of claim 1, wherein: the system comprises a computer and hypergraph three-dimensional geographic information system software, and can input, store, edit, inquire, analyze and simulate spatial information.
3. The three-dimensional display system for near-field radiation attenuation testing of claim 2, wherein: the system can display a topographic map by taking a three-dimensional digital map as a background, and the digital map has three-dimensional functions of zooming in, zooming out and roaming; the system has the functions of automatic map updating, recognition and loading.
4. The three-dimensional display system for near-field radiation attenuation testing of claim 3, wherein: the system can set and display parameters of the measuring equipment on a digital map; the antenna parameters of the equipment to be measured and the measuring equipment can be manually set and displayed on a digital map; the parameters of the equipment to be tested can be stored as templates, default values are automatically loaded when the equipment to be tested is used again, and the templates can also be manually selected; and automatically acquiring the position information of the equipment to be measured and the measuring equipment.
5. The three-dimensional display system for near-field radiation attenuation testing of claim 4, wherein: the antenna parameters comprise antenna type, radiation azimuth angle and height; the main parameters of the device to be measured and the device to be measured in transmitting power are manually set, and the parameters include frequency, bandwidth, radiation pattern and power.
6. A method for near field radiation attenuation testing using the near field radiation attenuation tested three dimensional display system of claim 1, said method comprising the steps of:
step one, setting parameters
1.1 set transmit and receive antenna parameters, including: transmitting frequency, transmitting antenna elevation angle, transmitting antenna elevation, transmitting antenna position, transmitting antenna direction, transmitting antenna polarization mode, receiving antenna elevation and antenna main lobe range;
1.2 the position of the transmitting point is obtained by external GPS equipment or specified on a three-dimensional earth;
1.3 setting calculation parameters of a system, including angle calculation interval, main lobe calculation distance, side lobe calculation distance and atmospheric refractive index;
step two, calculating step
2.1, generating a propagation path according to the input parameters, the main lobe and side lobe angle range, the given angle interval and the given calculation distance by the three-dimensional display system for the near-field radiation attenuation test;
2.2 the three-dimensional display system for near-field radiation attenuation test extracts the topographic profile, the earth surface coverage type data and the antenna parameters of the propagation path from the database, inputs the data into a WAPE radio wave propagation model for calculation, and obtains the attenuation value sets of different propagation paths;
2.21 judging whether to calculate a main lobe and a side lobe, when the main lobe is required to be calculated, calculating the distance according to the angle calculation interval and the main lobe range value of the antenna main lobe, and generating rays, wherein each angle corresponds to one ray;
2.22 when the side lobe is required to be calculated, calculating the distance of the angle outside the range of the main lobe of the antenna according to the angle calculation interval and the side lobe, and generating a plurality of rays;
2.3, taking points of each ray according to the sampling interval corresponding to the main lobe or the side lobe to obtain a series of three-dimensional coordinate points to form a topographic profile corresponding to the ray;
2.4, introducing parameters such as antenna parameters and topographic profiles into a radiation calculation model, and calculating attenuation values corresponding to each sampling point;
step three, visualizing the calculation result
3.1 rasterizing attenuation value values corresponding to the sampling points, and then realizing the whole visualization of the region of the selected region in the form of raster data;
3.11 calculating the boundary graph of the area of the selected area and the maximum external rectangle of the graph according to the coordinates of the sampling calculation points;
3.12 splitting the circumscribed rectangle into small grids, and then converting the small grids into images, wherein each small grid corresponds to a pixel, and the pixel value is a radiation attenuation value obtained by interpolating the central points of the grids;
3.13 geographic registration of the image to match the real calculation of the area;
3.14 calculating the boundary graph of the area to crop the registered image to obtain a cropped image which is completely matched with the calculated area graph;
3.15 according to the size of each pixel value in the image, establishing a color palette to generate a color image.
7. The method of near field radiation attenuation testing of claim 6, characterized by: the antenna parameters comprise frequency, elevation angle, polarization mode and atmospheric refractive index; the width of the small grid of the external rectangle is 5 meters by 5 meters.
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