CN105372506B - A kind of mutative scale gridding method calculated for region electromagnetic environment and system - Google Patents
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Abstract
The present invention relates to electromagnetic environment monitor technical field, and the invention discloses a kind of mutative scale gridding method calculated for region electromagnetic environment, it specifically includes following step：Region to be monitored is used into benchmark rasterizing, and distinguished with reference to geographical environmental information in region to be monitored and pay close attention to region and non-interesting region, region will be paid close attention to be divided with finer rasterizing yardstick, non-interesting region more domain will be divided with more rough rasterizing yardstick；After mutative scale rasterizing, calculated with new grid center, result of calculation represents the electromagnetic environment of whole grid region.By the above method, distinguished in region to be monitored and pay close attention to region and non-interesting region, both met user for paying close attention to the needs of the more careful differentiation in region, reduced amount of calculation again.The invention also discloses the system for realizing the above method.
Description
Technical Field
The invention relates to the technical field of electromagnetic environment monitoring, and discloses a variable-scale rasterization method and system for regional electromagnetic environment calculation.
Background
With the wide application of electromagnetic technology in the civil and military fields, the method has great significance for the research of electromagnetic wave propagation characteristics and field intensity distribution of the whole area under the complex environment.
The existing electromagnetic wave propagation characteristic prediction method mainly comprises an empirical model analysis method, a semi-empirical semi-deterministic model analysis method and a deterministic model analysis method. The propagation model is obtained through statistical derivation according to a large number of actual electric wave measurement results by an empirical model analysis method, the method is simple, the requirement on environmental information is not high, and the calculation accuracy is poor. The deterministic model analysis method is based on the research on the wireless propagation basic principle, is a theoretical model, and has the advantages of wide applicability, high calculation precision and the like, but large calculation amount and low calculation speed. The semi-empirical and semi-deterministic model analysis method is between the two methods, and a certain balance is made on the computation amount, the computation accuracy and the application range, so that the method is a compromise method.
However, at present, all algorithms are performed for a matched radiation source, that is, parameters such as the position, signal intensity, frequency and the like of the radiation source are preset, and the application range of the technology is greatly limited because the existing method cannot respond to the change of the electromagnetic environment in space in real time.
For example, CN201310754210.5 discloses a method and apparatus for estimating environmental electromagnetic radiation of a base station. The method for estimating the environmental electromagnetic radiation of the base station comprises the following steps: acquiring a first radiation quantity estimated value of a broadcast beam of a base station at a prediction point and a second radiation quantity estimated value of a service beam of the base station at the prediction point; and generating an environment electromagnetic radiation estimated value of the base station at the predicted point according to the first radiation estimated value and the second radiation estimated value. The method is implemented on the premise that the base station is known with certainty as a radiation source and that the parameters of the radiation source are known in detail.
For another example, CN201510329815.9 discloses a simulation method for simulating electromagnetic distribution in a strong electromagnetic pulse environment. According to the method, a hyperbolic cosine function is used for simulating an electromagnetic pulse waveform in a time domain, a time domain finite difference algorithm is used for simulating the electromagnetic field change of the environment, a GPU is used for realizing the acceleration of the time domain finite difference method, the electromagnetic distribution condition in the time domain is obtained, finally, the electromagnetic distribution condition in the frequency domain is obtained through fast Fourier transform, and the problem of calculating the electromagnetic environment distribution characteristic of an ultra-large-size object under the attack of an electromagnetic pulse weapon is solved. Likewise, the method is carried out on the premise that the radiation source is known with certainty and that the parameters of the radiation source are known.
Meanwhile, to calculate the electromagnetic environment of a region by using the above method, the region is usually rasterized, and then the electromagnetic field of each raster region is calculated, but this processing is too many for the raster points of a large region, and the calculation amount is very large. And the attention of users may be different for different small areas, and the requirements for calculation accuracy are different. Therefore, the existing rasterization method is difficult to meet the requirements of practical application, and the application range of the technology is greatly limited.
Disclosure of Invention
The invention aims to solve the technical problems that the method in the prior art is large in calculation amount and difficult to meet the user requirements. The invention discloses a variable-scale rasterization method for regional electromagnetic environment calculation and also discloses an electromagnetic environment real-time monitoring system.
The technical scheme of the invention is as follows
The invention discloses a variable-scale rasterization method for regional electromagnetic environment calculation, which specifically comprises the following steps: rasterizing a region to be monitored by adopting a reference scale, distinguishing a key attention region and a non-attention region in the region to be monitored by combining geographic environment information, dividing the key attention region by using a finer rasterization scale, and dividing the non-attention region by using a coarser rasterization scale; and after variable-scale rasterization, calculating by using the new grid center position, wherein the calculation result represents the electromagnetic environment of the whole grid area.
Still further, the above method further comprises: step one, arranging a plurality of monitoring points in an area needing to monitor field intensity, wherein the monitoring points are used for monitoring the field intensity in real time; step two, positioning the radiation source in real time according to the field intensity monitored in the step one, the position coordinates of the monitoring points and the geographical environment information of the area, and calculating the emission power of the radiation source; and step three, calculating the electromagnetic environment distribution condition of the area to be monitored according to the radiation source parameters calculated in the step two and the geographic environment information of the area to be monitored.
Further, the second step specifically includes the following steps: (1) positioning a radiation source; (2) respectively calculating signal propagation paths between each monitoring point and the radiation source by combining the position of each monitoring point and the determined position of the radiation source, wherein the propagation paths comprise a direct path, a reflection path and a diffraction path; (3) calculating the propagation attenuation of the signals propagated by different paths at the monitoring point, and estimating the radiation power from the radiation source to each monitoring point by combining the received signal strength measured by the monitoring point; (4) and comprehensively evaluating the emission power of the radiation source by combining the radiation power of the radiation source to the directions of all the monitoring points.
Furthermore, the positioning is particularly a time-lapse positioning or a cross positioning for determining the position of the radiation source.
Further, the third step specifically includes: (a) searching out the propagation path of the electromagnetic wave of the positioned radiation source by combining the geographic environment information; (b) the geographical environment is averagely divided into a plurality of receiving points, and the field intensity of each receiving point in the geographical environment is calculated according to different propagation paths.
Furthermore, the propagation path in step (a) includes determining a direct propagation path, searching a reflected propagation path, and searching a diffracted propagation path.
Further, the step (b) specifically includes: and respectively calculating the direct transmission, diffraction and/or reflection propagation attenuation on each path, and superposing the field intensity obtained on each path to obtain the field intensity of each receiving point.
Furthermore, the calculation formula of the direct electric field attenuation is as follows:，whereinin order to emit the radiation field strength,the ray propagation path length of the direct wave receiving point,is the wavelength.
Further, the reflected fieldAnd diffraction fieldThe calculation formulas of (A) and (B) are respectively as follows:，wherein、respectively diffusion factors of the reflected wave and the diffracted wave, R, D respectively reflection coefficient and diffraction coefficient, and the calculated field intensity of each propagation path is superposed to obtain the total field intensity，And obtaining the field intensity of the receiving point.
The invention also discloses a variable-scale rasterization system for regional electromagnetic environment calculation, which specifically comprises a reference scale rasterization unit, a geographic environment information acquisition unit, a judgment unit and a rasterization scale updating unit; the reference scale rasterization unit is used for rasterizing the area to be monitored by adopting a reference scale; the geographic environment information acquisition unit is used for acquiring geographic environment information of an area to be monitored; the judging unit is used for distinguishing a key attention area and a non-attention area in the area to be monitored according to the geographic environment information; the rasterization scale updating unit is used for updating the rasterization scales of the key attention area and the non-attention area according to the judgment result of the judgment unit, dividing the key attention area by using a finer rasterization scale, dividing the non-attention area by using a coarser rasterization scale, calculating by using a new grid center position after variable-scale rasterization, and enabling the calculation result to represent the electromagnetic environment of the whole grid area.
By adopting the technical scheme, the invention has the beneficial effects that: the method solves the problems that the total number of grids is too large, the calculated amount is too large and the calculation of the large-area electromagnetic environment cannot be completed in a short time due to the traditional grid dividing mode, and solves the problems that the traditional method is single in scale and does not distinguish the important attention area and the non-attention area in the calculation of the area electromagnetic environment. The size and the calculated amount of the area are balanced, and the requirements of different areas requiring different precisions are met. The problem that after a large area is rasterized, the grid is too much and calculation is difficult is solved. Meanwhile, the invention can solve the problem of real-time calculation of the electromagnetic environment, can calculate the regional electromagnetic environment by self under the condition of no control, does not need to spend manpower to investigate and set a newly-appeared radiation source, and greatly improves the applicability of the system.
Drawings
FIG. 1 is a schematic diagram of reference scale rasterization.
Fig. 2 is a variable scale rasterization example 1.
Fig. 3 is a variable scale rasterization example 2.
Fig. 4 is a flow chart of real-time monitoring processing of electromagnetic environment.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram of prior art fiducial scale rasterization. The region to be monitored is rasterized according to the reference scale, and the obtained result is shown in fig. 1, and the size of the rasterized scale is set according to the comprehensive consideration of the size of the research region, the generalization requirements of the region environment (including terrain, buildings, forests and the like), the computing capacity and the like. In general, the electromagnetic environment of the region will be calculated using reference scale rasterization, and the electromagnetic environment of the entire grid region will be represented by the calculation of the grid center coordinate position.
The variable-scale rasterization is to divide part of the research area into finer or coarser areas for key attention areas or non-attention areas. The variable-scale rasterization is based on the reference-scale rasterization, and is to subdivide a certain reference-scale grid or merge a plurality of adjacent reference-scale grids and then subdivide the grids with new scales. After the variable-scale rasterization, the center position of the grid is still used as a calculation parameter, and the calculation result represents the electromagnetic environment of the whole grid area.
In practical applications, if the region to be studied is large or in order to reduce the computation amount, the region of interest may be calculated by using a finer rasterization scale, and the region of no interest may be calculated by using a coarse rasterization scale, so as to balance the contradiction between the size of the calculation region and the computation amount.
And if the ray passes through the grid after variable-scale rasterization, using the geographical environment information corresponding to the modified grid.
As shown in fig. 2, the area covered by the black frame is an important attention area, and the area is divided by a finer rasterization scale to obtain a finer grid, so as to meet the special needs of the user.
As shown in fig. 3, the region covered by the tree flag is a non-attention region, and the region is calculated by a coarser rasterization scale to reduce the amount of calculation.
Therefore, the invention discloses a variable-scale rasterization method for regional electromagnetic environment calculation, which specifically comprises the following steps: rasterizing a region to be monitored by adopting a reference scale, distinguishing a key attention region and a non-attention region in the region to be monitored by combining geographic environment information, dividing the key attention region by using a finer rasterization scale, and dividing the non-attention region by using a coarser rasterization scale; and after variable-scale rasterization, calculating by using the new grid center position, wherein the calculation result represents the electromagnetic environment of the whole grid area. The selection of the specific standard scale and the specific adopted finer or coarse rasterization scale are flexibly selected according to the needs, and are not limited herein. By the method, the key attention area and the non-attention area are distinguished in the area to be monitored, so that the requirement of a user for more detailed distinguishing of the key attention area is met, and the calculation amount is reduced.
Furthermore, in order to calculate the regional electromagnetic environment without knowing the radiation source parameters in advance, the invention also discloses a real-time electromagnetic environment monitoring method, which specifically comprises the following steps: step one, setting a plurality of monitoring points in an area needing to monitor field intensity, wherein the number of the monitoring points is determined according to the area size and a positioning mode, the monitoring points are used for monitoring the field intensity in real time, parameters needing to be measured generally comprise parameters such as signal frequency, received signal intensity and the like, time difference or direction finding needs to be measured sometimes according to different positioning methods, and technicians for specifically determining which parameters can set the parameters as required without limitation; step two, positioning the radiation source in real time according to the field intensity monitored in the step one, the position coordinates of the monitoring points and the geographical environment information of the area, and calculating the field intensity of the emitted rays of the radiation source; the method comprises the following specific steps: (1) positioning a radiation source; (2) respectively calculating signal propagation paths between each monitoring point and the radiation source by combining the position of each monitoring point and the determined position of the radiation source, wherein the signal propagation paths comprise a direct path, a reflection path and a diffraction path; (3) calculating the propagation attenuation of the signals propagated by different paths at the monitoring point, and estimating the radiation power of the radiation source in the direction from the radiation source to each monitoring point by combining the received signal strength measured by the monitoring point; (4) the radiation power of the radiation source is comprehensively evaluated in combination with the radiation power of the radiation source to each monitoring point direction, for example, the average power in each direction can be used as the radiation power for the radiation source using an omnidirectional antenna, and the radiation power can be estimated in a fitting manner in combination with a prior directional diagram for the radiation source using a directional antenna. And step three, calculating the electromagnetic environment distribution condition of the area to be monitored according to the radiation source parameters calculated in the step two and the geographic environment information of the area to be monitored. Through the steps, the distribution condition of the electromagnetic environment can be monitored in real time without knowing the radiation source parameters in advance, the problem of calculating the electromagnetic environment generated by a non-matched radiation source is solved, and the labor cost is also saved. The method can automatically calculate the regional electromagnetic environment under the unmanned condition, does not need to spend manpower to investigate and set a new radiation source, and greatly improves the application range. The real-time monitoring process flow chart of the electromagnetic environment shown in fig. 4 includes the following steps: firstly, positioning a radiation source and extracting radiation parameters of the radiation source, then determining a propagation path of electromagnetic waves according to known geographic environment information, and calculating the field strengths of different position points according to the attenuation of the electromagnetic waves under different propagation paths.
Furthermore, the real-time positioning of the radiation source is to determine the position of the radiation source by using time difference positioning or cross positioning. At least three monitoring points are needed by adopting time difference positioning, and high-precision time synchronization is carried out between each monitoring point, the monitoring points are distributed according to the time difference positioning requirement, and the periphery of a distribution area can be distributed on one side according to the actual application environment; at least two monitoring points are needed by adopting cross positioning, each monitoring point needs to have a direction finding function, and the position of the monitoring point is determined according to the practical application environment.
Further, the third step specifically includes: (a) searching out the propagation path of the electromagnetic wave of the positioned radiation source by combining the geographic environment information; (b) the geographical environment is divided into a plurality of receiving points, and the field intensity of each receiving point in the geographical environment is calculated according to different propagation paths. The method comprises the steps of dividing a geographical environment into a plurality of receiving points, and rapidly calculating the field intensity of each receiving point according to the parameters of a radiation source and geographical information so as to monitor the electromagnetism in the environment in real time.
Furthermore, the step (a) specifically includes determining a direct propagation path, searching a reflected propagation path, and searching a diffracted propagation path. Judging a direct propagation path:
the direct radiation propagation path is a situation that whether direct radiation exists or not is judged by combining the position of the radiation source, the position of the receiving equipment and geographical environment information and whether direct radiation exists or not is judged by whether the radiation source and the receiving equipment are shielded by objects such as buildings in the environment or not.
Reflected propagation path finding
If the signal is shielded, the signal is reflected on the shielding surface, the reflection propagation path is combined with the reflecting surface, a mirror image point of the radiation source relative to the reflecting surface is searched, the mirror image point is used as a new starting point, and the propagation path of the reflected ray is determined according to a direct propagation mode. The reflection propagation is divided into the conditions of primary reflection, secondary reflection and the like, and the propagation path of each reflection is respectively determined by searching the mirror image point again when the reflected ray is shielded again in multiple reflections.
Diffraction propagation path finding
Diffraction occurs at the edges of objects such as buildings, and the areas where diffraction occurs and the attenuation can be calculated according to diffraction theory. The diffraction is divided into a first diffraction and a second diffraction, and the multiple diffraction is determined by performing multiple calculations according to the theory of diffraction when the propagation path after the multiple diffraction passes the edge of the object again.
Reflection, diffraction and the like occur in a mixed manner, for example, the propagation path from the radiation source to the receiving device may include a diffraction and a reflection, which are calculated sequentially according to the occurrence sequence of the reflection and the diffraction during the propagation of the ray.
Further, the step (b) specifically includes: and respectively calculating the direct transmission, diffraction and/or reflection propagation attenuation on each path, and superposing the field intensity obtained on each path to obtain the field intensity of each receiving point.
The basic formula of the direct electric field attenuation calculation is as follows:
wherein,in order to emit the radiation field strength,the ray propagation path length of the direct wave receiving point,is the wavelength.
Reflected fieldAnd diffraction fieldThe basic calculation formula of (1) is:
wherein,、diffusion factors for the reflected wave and the diffracted wave, respectively, and R, D for the reflection coefficient and the diffraction coefficient, respectively.
Superposing the field intensity obtained by each calculated propagation path to obtain the total field intensity
The field intensity of the receiving point can be obtained.
The invention also discloses a real-time monitoring system of the electromagnetic environment, which specifically comprises a monitoring point and a computing unit, wherein the monitoring point is provided with an electromagnetic detector for monitoring the electromagnetic field of the position point; the calculation unit is used for calculating the position of the radiation source and the emission parameters of the radiation source according to the monitored values and the geographical environment information, and calculating the field intensity of the receiving point according to the calculated radiation source and the geographical position information.
Through the system, the radiation source can be directly calculated only by setting the monitoring point, and the radiation source can be automatically obtained without knowing the position and parameters of the radiation source in advance, so that the system is convenient for users to use.
The coefficients and parameters given in the above-described embodiments are provided to enable a person skilled in the art to make or use the invention, and the invention is not limited to the values given in the foregoing disclosure, and those skilled in the art can make modifications or adjustments to the above-described embodiments without departing from the inventive idea, and therefore the scope of protection of the invention is not limited by the above-described embodiments, but should be in the broadest scope consistent with the innovative features set forth in the claims.
Claims (8)
1. A variable-scale rasterization method for regional electromagnetic environment calculation specifically comprises the following steps: rasterizing a region to be monitored by adopting a reference scale, distinguishing a key attention region and a non-attention region in the region to be monitored by combining geographic environment information, dividing the key attention region by using a finer rasterization scale, and dividing the non-attention region by using a coarser rasterization scale; after variable-scale rasterization, calculating by using the new center position of the grid, wherein the calculation result represents the electromagnetic environment of the whole grid region;
the method further comprises the following steps: step one, arranging a plurality of monitoring points in an area needing to monitor field intensity, wherein the monitoring points are used for monitoring the field intensity in real time; step two, positioning the radiation source in real time according to the field intensity monitored in the step one, the position coordinates of the monitoring points and the geographical environment information of the area, and calculating the emission power of the radiation source; step three, calculating the electromagnetic environment distribution condition of the area to be monitored according to the radiation source parameters calculated in the step two and the geographic environment information of the area to be monitored;
the second step specifically comprises the following steps: (1) positioning a radiation source; (2) respectively calculating signal propagation paths between each monitoring point and the radiation source by combining the position of each monitoring point and the determined position of the radiation source, wherein the propagation paths comprise a direct path, a reflection path and a diffraction path; (3) calculating the propagation attenuation of the signals propagated by different paths at the monitoring point, and estimating the radiation power from the radiation source to each monitoring point by combining the received signal strength measured by the monitoring point; (4) and comprehensively evaluating the emission power of the radiation source by combining the radiation power of the radiation source to the directions of all the monitoring points.
2. The method of variable-scale rasterization for regional electromagnetic environment computations of claim 1 wherein said positioning is in particular using moveout positioning or cross positioning to determine the position of the radiation source.
3. The variable-scale rasterization method for regional electromagnetic environment computing as recited in claim 1, wherein said step three specifically comprises: (a) searching out the propagation path of the electromagnetic wave of the positioned radiation source by combining the geographic environment information; (b) the geographical environment is averagely divided into a plurality of receiving points, and the field intensity of each receiving point in the geographical environment is calculated according to different propagation paths.
4. The method of variable-scale rasterization for regional electromagnetic environment computation of claim 3 wherein said step is
(a) The propagation path in (1) specifically includes judgment of a direct propagation path, search of a reflected propagation path, and search of a diffracted propagation path.
5. The method of variable-scale rasterization for regional electromagnetic environment computation of claim 3 wherein said step is
(b) The method specifically comprises the following steps: and respectively calculating the direct transmission, diffraction and/or reflection propagation attenuation on each path, and superposing the field intensity obtained on each path to obtain the field intensity of each receiving point.
6. The variable-scale rasterization method for regional electromagnetic environment calculation of claim 5 wherein the direct electric field attenuation is calculated as:wherein E is0D is the ray propagation path length of the direct wave receiving point, and lambda is the wavelength.
7. The variable-scale rasterization method for regional electromagnetic environment computation of claim 6, wherein the reflected field E isrAnd diffraction field EdThe calculation formulas of (A) and (B) are respectively as follows: er＝E0×As×R×e-jkd，Ed＝E0×Ad×D×e-jkdWherein A iss、AdThe calculated field intensity obtained by each propagation path is superposed to obtain the total field intensity E, wherein the diffusion factors are respectively reflection wave and diffraction wave, R, D are respectively reflection coefficient and diffraction coefficienttotal，The field intensity of the receiving point can be obtained.
8. A rasterization method based on claim 1 and used for a variable-scale rasterization system of regional electromagnetic environment calculation, which is characterized by specifically comprising a reference scale rasterization unit, a geographic environment information acquisition unit, a judgment unit and a rasterization scale updating unit; the reference scale rasterizing unit is used for rasterizing the area to be monitored by adopting a reference scale; the geographic environment information acquisition unit is used for acquiring geographic environment information of an area to be monitored; the judging unit is used for distinguishing a key attention area and a non-attention area in the area to be monitored according to the geographic environment information; the rasterization scale updating unit is used for updating the rasterization scales of the key attention area and the non-attention area according to the judgment result of the judgment unit, dividing the key attention area by using a finer rasterization scale, dividing the non-attention area by using a coarser rasterization scale, calculating by using a new grid center position after variable-scale rasterization, and enabling the calculation result to represent the electromagnetic environment of the whole grid area.
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