CN114076854A - Antenna directional diagram visualization method suitable for moment method post-processing - Google Patents
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Abstract
The invention discloses an antenna directional diagram visualization method suitable for post-processing by a moment method, which comprises the following steps of: s1, establishing an antenna model and appointing excitation of an antenna; s2, determining a system matrix and a right vector required by moment method calculation; s3, establishing a spherical angle two-dimensional gridS4, obtaining angles on grid vertexes through post-processing by using a moment methodPerpendicular polarization direction of the antennaDirection of horizontal polarizationFar field directivity data of the resultant total field, denotedAndthe directional data can be tabulated asAnd S5, performing visual processing on the directional data of the antenna. The invention can meet the matching of the antenna directional diagram display size with the platform and model display size under different application occasions, and the geometric measurement of the lobe diagram of the antenna can be realized until the antenna has a visual display effect.
Description
Technical Field
The invention relates to antenna pattern processing, in particular to an antenna pattern visualization method suitable for post-processing by a moment method.
Background
The parameterized curve structure has very wide application in electromagnetic field analysis, such as the fields of thin-line antenna structures, the construction of complex curved surfaces in electromagnetic field analysis and the like. However, at present, the three-dimensional visualization problem along the far-field pattern of the antenna, the polarization switching problem of the far-field antenna of the antenna, the color configuration problem of the far-field pattern of the antenna, the switching problem of the far-field pattern dB and the original value of the antenna, the switching problem of the dynamic range of the far-field pattern of the antenna, and the alignment problem of the far-field pattern of the antenna and the antenna model, especially the complex structure model, are difficult to be effectively solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an antenna directional diagram visualization method suitable for post-processing by a moment method, and can meet the matching of the antenna directional diagram display size with the platform and model display size under different application occasions, and the geometric measurement of the lobe diagram of the antenna is performed until the lobe diagram is displayed visually.
The purpose of the invention is realized by the following technical scheme: an antenna directional pattern visualization method suitable for moment method post-processing comprises the following steps:
s1, establishing an antenna model and appointing excitation of an antenna;
s2, determining a system matrix and a right vector required by moment method calculation;
S4, obtaining angles on grid vertexes through post-processing by using a moment methodPerpendicular polarization direction of the antennaDirection of horizontal polarizationFar field directivity data of the resultant total field, denotedAndthe directional data can be tabulated as
And S5, performing visual processing on the directional data of the antenna.
The step S1 includes:
extracting a point list and a point connection list of an antenna CAD surface element grid model from a lattice model file in a nanostran format, and designating antenna excitation;
converting the point list and the point connection list in the antenna CAD surface element grid model into a basis function required by a moment method through the format of RWG basis function, wherein the basis function list is fmM is 1,2, …, nbase, where nbase is the total number of basis functions.
Further, the step S2 includes:
s201. Pair matrix [ A ]]nbase×nbaseFilling to obtain a system matrix A, a required by moment method calculationmnThe mth row and nth column element of A; the fill formula is as follows:
wherein f ismAnd fnIs the mth and nth basis functions, G is a three-dimensional Green's function; epsilonlIs the free space dielectric constant; mu.slIs free space permeability;in order to be a spatial linear differential operator,omega is angular frequency; r' is the region where the source point is located, i.e. fnA position vector within the region; r is the area where the field point is located, i.e. fmA position vector within the region;
s202, excitation item [ rhs ] is paired]nbaseFilling to obtain a right vector required by moment method calculation;
wherein the content of the first and second substances,is the field distribution in the mth basis function domain under excitation;
and S203, calculating and solving Ax ═ rhs to obtain x, wherein the x is the current amount x [ ibase ] on the unknown quantity of each base function ibase, and the ibase is an integer subscript from 1 to nbase.
i is 0,1,2, …, M; j is 0,1,2, …, N, where M is the number of splits in the theta direction, and N isNumber of splits in direction.
Further, the step S4 includes:
s401, for spherical angle two-dimensional gridAt any pointCalculating the far field of horizontally polarized electromagnetic waveAnd vertically polarized electromagnetic far field
Wherein E islAnd HlThe electric field distribution and the magnetic field distribution on the triangular surface element are obtained by interpolation and differential calculation of a current basis function current distribution list cbm in a triangular domain;is composed ofThe unit direction vector of the angular vertical polarization,is the unit direction vector of the angular horizontal polarization,is composed ofA radial unit vector in angle; delta Sl' is the antenna surface discrete unit area; r 'is delta S'lAny point vector above; η is 120 pi; k is the wave number in free space,r is the radial distance of the field point far away from the origin of coordinates;is a normal unit vector;
s402, performing power integration on the electric fields of all target observation angles to obtain a directivity coefficient, and normalizing the directivity coefficient for the electric fields to obtain the vertical polarization direction of the antennaDirection of horizontal polarizationSynthesizing far field directivity data for a total field
Wherein, P represents far-field radiation power, eta-120 pi represents free space wave impedance, DnormRepresenting a directivity coefficient;
s403. when i is 0,1,2, …, M; if j is 0,1,2, …, N, and if i and j are arbitrarily combined, steps S401 to S402 are repeated to obtain the correspondingWhen all combinations of the values of i and j are executed, recording the obtained data list as
Further, the step S5 includes:
first, normalization of directivity data and determination of spherical radius R where directivity data is located
Defining the outermost spherical surface drawn by the directional diagram as Rout
Case 1: non-dB directional pattern mapping
The mapping of the pattern data need not be performed,the outermost spherical radius R is equal to RoutWhere max is a function of the maximum in the list, each direction dataThe spherical radius is as follows:
case 2: dB directional diagram rendering
When a directional diagram is drawn, in order to solve the problem of absolute radius when the directional diagram is displayed in a dB mode, the directional data needs to be normalized, and the specific method is to define a dynamic range parameter DrIn dB from the directional data listIs found inThen define the minimum value of the directional data as Will be provided withAll of them are less thanIs assigned a value ofdB is a function, directional data is converted into dB data dB (D) 10 log10(D) Thus, the normalization of the directivity data when the dB directional diagram is drawn is completed;
the outermost spherical radius R is equal to RoutData of each directionThe spherical radius is as follows:
two-dimensional mesh vertex with spherical angleTo three-dimensional rectangular coordinates [ (x)i,yi,zi)]M×NThe transformation of (2):
wherein RAD is 0.01745
Three, spherical triangular gridding processing
To pairPi+1,j,Pi+1,j+1,Pi,j+1Dividing the enclosed two-dimensional mesh of the spherical angular points to obtain two triangular meshes of the spherical angular points: tri1 (P)i,j,Pi+1,j,Pi+1,j+1) And Tri2 (P)i+1,j+1,Pi,j+1,Pi,j);
Mixing P in Tr1 and Tr2i,j,Pi+1,j,Pi+1,j+1,Pi,j+1Conversion to rectangular coordinate system point [ (x)m,n,ym,n,zm,n)]Wherein m ═ i, i + 1; obtaining the three-dimensional plane triangular coordinates mapped by Tri1 and Tri2 on the spherical surface and point connection, traversing i from 0 to M-1, and traversing j from 0 to N-1; collecting the three-dimensional plane triangular coordinates on all the spherical surfaces and connecting the three-dimensional plane triangular coordinates with the points to form a point list [ spts ]]NPAnd a point connection list (scon)]NC(ii) a Wherein NP represents the number of points in the point list; NC represents the number in the point connection list; x is the number ofm,n,ym,n,zm,nThe value of (2) is determined by calculation in step two, and R in step two is determined by calculation from the actually normalized directivity coefficient value in the first step according to a dB or non-dB mode;
fourthly, scaling, size control and R of directional diagramoutIs determined
Because the control of the display effect of the digraph needs to be adapted to different resolutions of different displays, the spherical radius R of a reference can be set according to the size of the display area of the screennormAnd setting different display radius control coefficients CR,
Rout=CR·Rnorm
Obtaining the actual outermost spherical radius RoutSo as to control the scaling and size control of the directional diagram;
fifthly, moving, rotating and aligning the position of the directional diagram
Because the antenna needs to be installed at different positions and different angular postures of the complex scatterer, the antenna directional diagram needs to be subjected to translation and rotation operations, and the central position of the directional diagram is moved from (0, 0, 0) to (x) in the translation processp,yp,zp) The post coordinate transformation formula is: zi=zp+Rcos(RAD·θi)
wherein RAD is 0.01745
By arranging (x) on the surface of a complex diffuserp,yp,zp),iu=(ux,uy,uz),iv=(vx,vy,vz),iw=(wx,wy,wz) For the local coordinate system, by calculating
The invention has the beneficial effects that: 1) in the process of determining the spherical radius R, the spherical radius of the outermost layer is RoutAnd a control coefficient CRThe introduction of the antenna can solve the functional requirement that the antenna relative to the platform model scale is self-adaptively adjusted according to the size of the screen, and the problem that the display size of an antenna directional diagram is not matched with the display sizes of the platform and the model under different application occasions is solved;
2) dynamic Range parameter DrThe introduction of the parameters solves the problem that the antenna directional diagram is in a dB drawing state, and a very small far field value causes a very large spherical radius which is not in accordance with the actual situation; in addition, the range parameter D can be usedrControlling parameters, measuring the lobe pattern of the antenna until the lobe pattern is displayed visually (for example, the main lobe width and the auxiliary lobe width of the antenna are displayed more directly)
3) The position of the directional diagram is moved, and the directional diagram is rotated and aligned, so that the problem of displaying the directional diagram of the antenna under different mounting planes is solved through vector transformation of coordinates of each corner point of the directional diagram of the antenna.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic diagram of an antenna model in an embodiment;
FIG. 3 is a schematic diagram of a two-dimensional grid of spherical angles in an embodiment;
FIG. 4 is a diagram illustrating far field directivity data in an embodiment;
FIG. 5 is a schematic diagram of a non-dB directional diagram plotting linear mapping relationship between spherical radius and directional data in an embodiment;
FIG. 6 is a diagram of a linear mapping relationship between the radius of a spherical surface and direction data plotted in a dB directional diagram in an embodiment;
FIG. 7 is a schematic diagram illustrating a mapping from vertices of a spherical-angle two-dimensional mesh to three-dimensional rectangular coordinates in an embodiment;
FIG. 8 is a schematic diagram of segmentation of a two-dimensional grid of spherical corner points in the embodiment;
FIG. 9 is a diagram showing post-installation processing of antenna patterns in an embodiment;
FIG. 10 is a mapping of non-dB directional data versus color values for an embodiment;
FIG. 11 is a mapping of dB direction data to color values for an embodiment;
FIG. 12 is a schematic color chart of a first triangular lattice painting according to the embodiment;
FIG. 13 is a schematic color chart of a first triangular lattice painting according to the embodiment;
FIG. 14 is an antenna pattern shown in non-dB;
fig. 15 is a control diagram of antenna pattern dynamic range.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, an antenna pattern visualization method suitable for moment method post-processing includes the following steps:
s1, establishing an antenna model (such as a horn antenna shown in figure 2) and appointing excitation of the antenna (shown in yellow in figure 2);
the step S1 includes:
extracting a point list and a point connection list of an antenna CAD surface element grid model from a lattice model file in a nanostran format, and designating antenna excitation;
converting the point list and the point connection list in the antenna CAD surface element grid model into a basis function required by a moment method through the format of RWG basis function, wherein the basis function list is fmM is 1,2, …, nbase, where nbase is the total number of basis functions.
S2, determining a system matrix and a right vector required by moment method calculation;
further, the step S2 includes:
s201. Pair matrix [ A ]]nbase×nbaseFilling to obtain a system matrix A, a required by moment method calculationmnThe mth row and nth column element of A; filling inThe formula is as follows:
wherein f ismAnd fnIs the mth and nth basis functions, G is a three-dimensional Green's function; epsilonlIs the free space dielectric constant; mu.slIs free space permeability;in order to be a spatial linear differential operator,omega is angular frequency; r' is the region where the source point is located, i.e. fnA position vector within the region; r is the area where the field point is located, i.e. fmA position vector within the region;
s202, excitation item [ rhs ] is paired]nbaseFilling to obtain a right vector required by moment method calculation;
wherein the content of the first and second substances,is the field distribution in the mth basis function domain under excitation;
and S203, calculating and solving Ax ═ rhs to obtain x, wherein the x is the current amount x [ ibase ] on the unknown quantity of each base function ibase, and the ibase is an integer subscript from 1 to nbase.
S3, establishing a spherical two-dimensional network and establishing a spherical angle two-dimensional grid
i is 0,1,2, …, M; j is 0,1,2, …, N, where M is the number of splits in the θ direction (for 360 degrees) and N isNumber of splits in direction (for 360 degrees).
S4, obtaining angles on grid vertexes through post-processing by using a moment methodPerpendicular polarization direction of the antennaDirection of horizontal polarizationFar field directivity data of the resultant total field, denotedAnd(as shown in FIG. 4), the list of directional data that can be achieved is
The step S4 includes:
s401, for spherical angle two-dimensional gridAt any pointCalculating the far field of horizontally polarized electromagnetic waveAnd vertically polarized electromagnetic far field
Wherein E islAnd HlThe electric field distribution and the magnetic field distribution on the triangular surface element are obtained by interpolation and differential calculation of a current basis function current distribution list cbm in a triangular domain;is composed ofThe unit direction vector of the angular vertical polarization,is the unit direction vector of the angular horizontal polarization,is composed ofA radial unit vector in angle; delta Sl' is the antenna surface discrete unit area; r' is Δ Sl' any point vector on; η is 120 pi; k is the wave number in free space,r is the radial distance of the field point far away from the origin of coordinates;is a normal unit vector;
s402, performing power integration on the electric fields of all target observation angles to obtain a directivity coefficient, and normalizing the directivity coefficient for the electric fields to obtain the vertical polarization direction of the antennaDirection of horizontal polarizationSynthesizing far field directivity data for a total field
Wherein, P represents far-field radiation power, eta-120 pi represents free space wave impedance, DnormRepresenting a directivity coefficient;
s403. when i is 0,1,2, …, M; j is 0,1,2, …, in NAnd repeating the steps S401 to S402 under any combination of values of i and j to obtain the correspondingWhen all combinations of the values of i and j are executed, recording the obtained data list as
And S5, performing visual processing on the directional data of the antenna. The foregoing steps illustrate a process for calculating antenna far-field directivity data by a moment method, and the following describes a visualization process of the antenna directivity data and a corresponding method. Since the processing flows of the vertical polarization direction diagram post-processing display, the horizontal polarization direction diagram post-processing display and the total direction diagram post-processing display are the same, only the vertical polarization direction diagram is taken as an example below, and the post-processing display scheme (the vertical polarization direction corresponds to the directivity) one, the normalization of the directivity data and the determination of the spherical radius R where the directivity data is located are described below
Defining the outermost spherical surface drawn by the directional diagram as Rout
Case 1: non-dB directional pattern mapping
The mapping of the pattern data need not be performed,the outermost spherical radius R is equal to RoutWhere max is a function of the maximum in the list, each direction dataThe spherical radius is as follows:the linear mapping relationship between the spherical radius and the direction data is shown in FIG. 5
Case 2: dB directional diagram rendering
When the directional diagram is drawn, in order to solve the problem of absolute radius when the directional diagram is displayed in a dB mode, the directional data needs to be inputLine normalization, the specific method is to define a dynamic range parameter DrIn dB from the directional data listIs found inThen define the minimum value of the directional data as Will be provided withAll of them are less thanIs assigned a value ofdB is a function, directional data is converted into dB data dB (D) 10 log10(D) Thus, the normalization of the directivity data when the dB directional diagram is drawn is completed;
the outermost spherical radius R is equal to RoutData of each directionThe spherical radius is as follows:the linear mapping relation of the spherical radius and the direction data is shown in figure 6 as the vertex of the two-dimensional mesh with two spherical anglesTo three-dimensional rectangular coordinates [ (x)i,yi,zi)]M×NThe transformation formula of (1):
the mapping of the vertices of a spherical-angle two-dimensional mesh (four vertices in FIG. 2) to three-dimensional rectangular coordinates is schematically illustrated in FIG. 7
wherein RAD is 0.01745
Three, spherical triangular gridding processing
To pairPi+1,j,Pi+1,j+1,Pi,j+1The two-dimensional mesh of spherical corner points enclosed as shown in fig. 2 is divided as shown in fig. 7 to obtain two triangular meshes of spherical corner points: tri1 (P)i,j,Pi+1,j,Pi+1,j+1) And Tri2 (P)i+1,j+1,Pi,j+1,Pi,j) (ii) a Referring to the second, P in Tr1 and Tr2i,j,Pi+1,j,Pi+1,j+1,Pi,j+1Conversion to rectangular coordinate system point [ (x)m,n,ym,n,zm,n)]Wherein m ═ i, i + 1; obtaining the three-dimensional plane triangular coordinates mapped by Tri1 and Tri2 on the spherical surface and point connection, traversing i from 0 to M-1, and traversing j from 0 to N-1; collecting the three-dimensional plane triangular coordinates on all the spherical surfaces and connecting the three-dimensional plane triangular coordinates with the points to form a point list [ spts ]]NPAnd a point connection list (scon)]NC(ii) a Wherein NP represents the number of points in the point list; NC represents the number in the point connection list; x is the number ofm,n,ym,n,zm,nThe value of (2) is determined by calculation of two, and R in the second is determined by calculation of the directivity coefficient value after actual normalization in the first according to a dB or non-dB mode; schematically shown in FIG. 8
Fourthly, scaling, size control and R of directional diagramoutIs determined
Because of the need to accommodate the control of the effect of the histogram display at different resolutions of different displays, the display of the histogram is controlled by the display controllerThe spherical radius R of a reference can be set according to the size of the screen display areanormAnd setting different display radius control coefficients CRE.g. six 0.3,0.5,1,1.3,2,3
Rout=CR·Rnorm
Obtaining the actual outermost spherical radius RoutTherefore, the scaling and size control of the directional diagram are controlled.
Fifthly, moving, rotating and aligning the position of the directional diagram
Because the antenna needs to be installed at different positions and different angular postures of the complex scatterer, the antenna directional diagram needs to be subjected to translation and rotation operations, and the central position of the directional diagram is moved from (0, 0, 0) to (x) in the translation processp,yp,zp) The post coordinate transformation formula is:zi=zp+Rcos(RAD·θi)
wherein RAD is 0.01745
By arranging (x) on the surface of a complex diffuserp,yp,zp),iu=(ux,uy,uz),iv=(vx,vy,vz),iw=(wx,wy,wz) For the local coordinate system, by calculating
In the embodiment of the application, after the visualization processing is completed, the visualization of the antenna directional pattern can be completed, for example, the directional pattern can be mounted on the surface of a complex scattering body, and the post-installation processing display of the antenna directional pattern is displayed, as shown in fig. 9 below;
in embodiments of the present application, the antennas may be further color-matched, for example, the antenna pattern color scheme is as follows:
the mapping of color values to non-dB direction data is shown in FIG. 10:
the value of each triangular grid obtained in step three is taken as direction data (D) on three corner points1,D2,D3) Mean direction data of (D) ═ D1+D2+D3) The mapping is performed according to/3, and the color value corresponding to the triangle is clr ═ D/Dmax*256;
Mapping of color values to directional data of the dB type is shown in FIG. 11
The values obtained in step three for each triangular mesh are taken as directional data (dB (D) at three corner points1),dB(D2),dB(D3) Average direction data of (D) ((D) (dB (D))1)+dB(D2)+dB(D3) 3) is mapped, the color value corresponding to the triangle is
Then for a color scheme with varying shades, RGB ═ R, G, B)
In the first case, can be takenG =0, B ═ clr% 256, int is the rounding function,% is the modulo operation; the obtained RGB value is the color of the triangular grid, the deeper the color is, the larger the numerical value is, and the lighter the color is, the smaller the numerical value is; as shown in fig. 12 (in the figure, shades of color values are expressed in grayscale):
in the second case of the above-mentioned case,g ═ clr% 256, B ═ 0, int the rounding function,% the modulus operation, and the resulting processing junctionAs shown in fig. 13 (in the figure, the shades of color values are expressed in gray scale).
In the embodiment of the present application, the dynamic range of the antenna pattern in the dB state display can be controlled, and the antenna pattern in the following non-dB display is shown in fig. 14 (in the figure, the shade of the color value is expressed by gray scale);
by dynamic range parameter DrAs shown in fig. 15 (in the figure, the shades of color values are expressed in gray scale).
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. An antenna directional pattern visualization method suitable for moment method post-processing is characterized in that: the method comprises the following steps:
s1, establishing an antenna model and appointing excitation of an antenna;
s2, determining a system matrix and a right vector required by moment method calculation;
S4, obtaining angles on grid vertexes through post-processing by using a moment methodPerpendicular polarization direction of the antennaLevel ofDirection of polarizationFar field directivity data of the resultant total field, denotedAndthe directional data can be tabulated as
And S5, performing visual processing on the directional data of the antenna.
2. The method of claim 1, wherein the method comprises the following steps: the step S1 includes:
extracting a point list and a point connection list of an antenna CAD surface element grid model from a lattice model file in a nanostran format, and designating antenna excitation;
converting the point list and the point connection list in the antenna CAD surface element grid model into a basis function required by a moment method through the format of RWG basis function, wherein the basis function list is fmM is 1,2, …, nbase, where nbase is the total number of basis functions.
3. The method of claim 1, wherein the method comprises the following steps: the step S2 includes:
s201. Pair matrix [ A ]]nbase×nbaseFilling to obtain a system matrix A, a required by moment method calculationmnThe mth row and nth column element of A; the fill formula is as follows:
wherein f ismAnd fnIs the mth and nth basis functions, G is a three-dimensional Green's function; epsilonlIs the free space dielectric constant; mu.slIs free space permeability;in order to be a spatial linear differential operator,omega is angular frequency; r' is the region where the source point is located, i.e. fnA position vector within the region; r is the area where the field point is located, i.e. fmA position vector within the region;
s202, excitation item [ rhs ] is paired]nbaseFilling to obtain a right vector required by moment method calculation;
wherein the content of the first and second substances,is the field distribution in the mth basis function domain under excitation;
and S203, calculating and solving Ax ═ rhs to obtain x, wherein the x is the current amount x [ ibase ] on the unknown quantity of each base function ibase, and the ibase is an integer subscript from 1 to nbase.
5. The method of claim 1, wherein the method comprises the following steps: the step S4 includes:
s401, for spherical angle two-dimensional gridAt any pointCalculating the far field of horizontally polarized electromagnetic waveAnd vertically polarized electromagnetic far field
Wherein E islAnd HlThe electric field distribution and the magnetic field distribution on the triangular surface element are obtained by interpolation and differential calculation of a current basis function current distribution list cbm in a triangular domain;is composed ofThe unit direction vector of the angular vertical polarization,is the unit direction vector of the angular horizontal polarization,is composed ofA radial unit vector in angle; delta S'lIs the discrete unit area of the antenna surface; r 'is delta S'lAny point vector above; η is 120 pi; k is the wave number in free space,r is the radial distance of the field point far away from the origin of coordinates;is a normal unit vector;
s402, performing power integration on the electric fields of all target observation angles to obtain a directivity coefficient, and normalizing the directivity coefficient for the electric fields to obtain the vertical polarization direction of the antennaDirection of horizontal polarizationSynthesizing far field directivity data for a total field
Wherein, P represents far-field radiation power, eta-120 pi represents free space wave impedance, DnormRepresenting a directivity coefficient;
6. The method of claim 1, wherein the method comprises the following steps: the step S5 includes:
first, normalization of directivity data and determination of spherical radius R where directivity data is located
Defining the outermost spherical surface drawn by the directional diagram as Rout
Case 1: non-dB directional pattern mapping
The mapping of the pattern data need not be performed,the outermost spherical radius R is equal to RoutWhere max is a function of the maximum in the list, each direction dataThe spherical radius is as follows:
case 2: dB directional diagram rendering
When a directional diagram is drawn, in order to solve the problem of absolute radius when the directional diagram is displayed in a dB mode, the directional data needs to be normalized, and the specific method is to define a dynamic range parameter DrIn dB from the directional data listIs found inThen define the minimum value of the directional data as Will be provided withAll of them are less thanIs assigned a value ofdB is a function, directional data is converted into dB data dB (D) 10 log10(D) Thus, the normalization of the directivity data when the dB directional diagram is drawn is completed;
the outermost spherical radius R is equal to RoutData of each directionThe spherical radius is as follows:
two-dimensional mesh vertex with spherical angleTo three-dimensional rectangular coordinates [ (x)i,yi,zi)]M×NThe transformation of (2):
wherein RAD is 0.01745
Three, spherical triangular gridding processing
To pairDividing the enclosed two-dimensional mesh of the spherical angular points to obtain two triangular meshes of the spherical angular points: tri1 (P)i,j,Pi+1,j,Pi+1,j+1) And Tri2 (P)i+1,j+1,Pi,j+1,Pi,j);
Mixing P in Tr1 and Tr2i,j,Pi+1,j,Pi+1,j+1,Pi,j+1Conversion to rectangular coordinate system point [ (x)m,n,ym,n,zm,n)]Wherein m ═ i, i + 1; obtaining the three-dimensional plane triangular coordinates mapped by Tri1 and Tri2 on the spherical surface and point connection, traversing i from 0 to M-1, and traversing j from 0 to N-1; collecting the three-dimensional plane triangular coordinates on all the spherical surfaces and connecting the three-dimensional plane triangular coordinates with the points to form a point list [ spts ]]NPAnd a point connection list (scon)]NC(ii) a Wherein NP represents the number of points in the point list; NC represents the number in the point connection list; x is the number ofm,n,ym,n,zm,nThe value of (2) is determined by calculation in step two, and R in step two is determined by calculation from the actually normalized directivity coefficient value in the first step according to a dB or non-dB mode;
fourthly, scaling, size control and R of directional diagramoutIs determined
Because the control of the display effect of the digraph needs to be adapted to different resolutions of different displays, the spherical radius R of a reference can be set according to the size of the display area of the screennormAnd setting different display radius control coefficients CR,
Rout=CR·Rnorm
Obtaining the actual outermost spherical radius RoutSo as to control the scaling and size control of the directional diagram;
fifthly, moving, rotating and aligning the position of the directional diagram
Because the antenna needs to be installed at different positions and different angular postures of the complex scatterer, the antenna directional diagram needs to be subjected to translation and rotation operations, and the central position of the directional diagram is moved from (0, 0, 0) to (x) in the translation processp,yp,zp) The post coordinate transformation formula is: zi=zp+Rcos(RAD·θi)
wherein RAD is 0.01745
By arranging (x) on the surface of a complex diffuserp,yp,z□),iu=(ux,uy,uz),iv=(vx,vy,vz),iw=(wx,wy,wz) For the local coordinate system, by calculating
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