CN104537188A - Reflector antenna panel functionality design method based on contour inversion technology - Google Patents
Reflector antenna panel functionality design method based on contour inversion technology Download PDFInfo
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Abstract
The invention discloses a reflector antenna panel functionality design method based on the contour inversion technology. The overall thought of the reflector antenna panel functionality design method includes the steps of firstly designing a deformation test of a reflecting panel of a reflector antenna to enable the panel to be obviously deformed, then actually testing the electrical performance of the reflector antenna to obtain antenna actual testing electrical performance indexes, actually testing the reflecting panel of the reflector antenna to obtain surface contour testing data, then inverting surface contour characteristic parameters with the antenna actual testing electrical performance indexes as an objective function, building a reflector antenna panel model comprising surface contour information, and achieving the functionality design of the panel of the reflector antenna. The reflector antenna panel functionality design method has the advantages that as it is considered that different-distribution-mode surface information is contained in the antenna panel surface contour information in a practical project, the surface contour is inverted with the antenna electrical performance indexes as the objective function, and the accuracy of the reflector antenna reflecting panel designing work is remarkably improved.
Description
Technical field
The present invention relates to a kind of functional design method of reflecting plane aerial panel, be specifically related to a kind of functional design method of the reflecting plane aerial panel based on profile inversion technique, belong to Antenna Design development technique field.
Background technology
Reflector antenna is a kind of typical electrical and mechanical comprehensive electronics product, and along with it is to high band, high-gain, high reliability and light-weighted direction development, the impact of structural factor on electrical performance indexes is more and more obvious.Wherein, the Reflector Panel of reflector antenna is the primary structure of antenna, and be again the boundary condition that Electromagnetic Fields of Antenna is propagated, therefore how the structural behaviour of Reflector Panel is the key point determining whole antenna performance.
In the design process that reflecting plane aerial panel is traditional, the structural design of panel is separated with the design of the electricity of entire physical and is independently carried out.On the one hand, in order to meet electrical performance indexes, counter plate structural design proposes too harsh accuracy requirement to electricity design effort personnel, cause structural design personnel to be difficult to meet or even its requirement cannot be met, even and if sometimes product reach accuracy requirement and but may not necessarily meet electrical performance indexes; On the other hand, structural design personnel find, weigh some antenna according to electric designer's requirement, and its design indices product not up to standard finally but can meet the requirement of electrical performance indexes unexpectedly.
The specialities of this typical electrical and mechanical comprehensive of reflector antenna, its structural design is for the realization of electrical performance indexes is served, and the ultimate aim of therefore its structural factor design also should be the optimization in order to realize electrical property.And by surface profile, the interact relation correlative study work of antenna electric performance is found, antenna electric performance optimization can directly be realized by the correlation parameter of control section structural factor, therefore, direct use electrical performance indexes instructs Antenna Construction Design, namely it is feasible for carrying out reflector antenna Reflector Panel towards the functional design work of electrical property, is also far reaching.
Summary of the invention
The object of the present invention is to provide a kind of effectively can improve reflector antenna computer-aided design (CAD) precision and efficiency, functional design method based on the reflecting plane aerial panel of profile inversion technique.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
Based on a functional design method for the reflecting plane aerial panel of profile inversion technique, it is characterized in that, comprise the following steps:
(1), to the Reflector Panel of reflector antenna carry out deformation experiment, make panel that obviously distortion occur;
(2), to the electrical property of reflector antenna survey, obtain antenna actual measurement electrical performance indexes;
(3), to the Reflector Panel of reflector antenna survey, obtain surface profile test data;
(4) the minimal characteristic parameter set of each composition information in surface profile, is set up;
(5), with antenna electric performance index for objective function, inverting surface profile mathematical model;
(6) the reflector antenna finite element model comprising surface profile information, is set up;
(7), set up reflector antenna emi analysis model, emulation obtains antenna emulation electrical performance indexes;
(8), by antenna emulate electrical performance indexes to contrast with actual measurement electrical performance indexes, if error meets accuracy requirement, then the functional design of reflecting plane aerial panel terminates; Otherwise, repeat step (2) to step (8), until meet accuracy requirement.
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, is characterized in that, in step (1), the process of the Reflector Panel of reflector antenna being carried out to deformation experiment is as follows:
Every block panel selects 13 bolts being arranged in reflecting surface and the T-shaped beam junction of radiation beam, and adds pad at bolt place, primary reflection surface panel is deformed.
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, it is characterized in that, aforementioned pad has three kinds of different thickness, be respectively S1=1.5mm, S2=2mm, S3=3mm, for the Normal Displacement making reflecting surface Nodes produce 1.5mm, 2mm and 3mm respectively.
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, is characterized in that, in step (2), the process of surveying the electrical property of reflector antenna is as follows:
(2a), keep minor face and feed constant, test antenna far-field pattern, obtains the actual measurement electrical performance indexes of antenna;
(2b), electrical performance indexes is selected to change one group of maximum shim size data as subsequent experimental data.
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, is characterized in that, in step (3), the process of surveying the Reflector Panel of reflector antenna is as follows:
(3a), according to panel deformation value select the metal probe contact pilotage of profile measurer, the radius of aforementioned contact pilotage is less than the half of the root-mean-square value of panel deformation amplitude;
(3b) sample length A and the evaluation length L of panel, is determined;
(3c), according to x to y to equidistant measuring route Uniform Scanning panel, obtain the surface profile test data of panel.
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, is characterized in that, in step (4), the process setting up the minimal characteristic parameter set of each composition information in surface profile is as follows:
(4a), linearity composition correlation parameter is the sign of the composition linearly changed in counter plate surface profile error measurement data, obtains the expression formula of linearity composition by the method for linear regression:
y
l(x)＝y
l0+s
lx (1)
In formula, y
l0for the intercept of linear segment, s
lfor slope,
The minimal characteristic parameter set characterizing linearity composition is:
L
e＝{y
l0,s
l} (2)
(4b), cyclic component correlation parameter is in the sign of cyclical variation composition in counter plate surface profile error measurement data, obtains the expression formula of cyclic component by the method for non-linear regression:
y
p(x)＝y
p0+d
asin(2f
rx/L) (3)
Wherein, y
p0for side-play amount, d
afor amplitude, f
rfor frequency, L is sample length,
The minimal characteristic parameter set characterizing cyclic component is:
P＝{y
p0,d
a,f
r} (4)
(4c), irregular composition correlation parameter be in counter plate surface profile error measurement data in non-periodic, nonrandom varying component sign, represent irregular composition by fractal function:
In formula, D is fractal dimension,
be the random initial phases position of each harmonic wave, b is scale factor, b>1, k
0space first-harmonic number,
amplitude controlling elements, R
afor root-mean-square height, M is most higher harmonics number,
Characterize irregular composition y
ix the minimal characteristic parameter set of () is:
I＝{D,C,m} (6)。
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, is characterized in that, in step (5), the process of inverting surface profile mathematical model is as follows:
(5a), the method effects on surface profile core parameter of minimization objective function is adopted to carry out inverting;
(5b), adopt the method for minimization objective function to carry out inverting to each composition characteristics parameter, and set up the minimal characteristic collection of surface profile mathematical model;
(5c), in conjunction with minimal characteristic collection, applying equation (2), (4), (6) are finally inversed by panel surface profile mathematical model.
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, is characterized in that, in step (6), sets up the process comprising the reflector antenna finite element model of surface profile information as follows:
(6a), use Ansys software, whole antenna structure finite element model is made up of 7569 nodes and 1237 unit, and foregoing units comprises 252 beam elements and 985 shell units;
(6b), according to the related data of applying pad aforementioned in step (2b), to single panel both sides 10-15 bolt point imposed load selecting, obtain the Normal Displacement of Distorted Reflector Antenna panel;
(6c), from Ansys software derive displacement result, obtain the reflector antenna finite element model comprising surface profile information.
The functional design method of the aforesaid reflecting plane aerial panel based on profile inversion technique, is characterized in that, in step (7), set up reflector antenna emi analysis model and emulation obtain antenna emulation electrical performance indexes process as follows:
(7a), the reflector antenna finite element model set up in step (6) is imported electromagnetic analysis software HFSS11.0;
(7b), radiation border is set, excitation, calculates the unit for electrical property parameters of antenna;
(7c), choose the theoretical unit for electrical property parameters of antenna, aforementioned theoretical unit for electrical property parameters is antenna gain G and the first minor level FSLL.
Usefulness of the present invention is: for the precision and efficiency that improve the design effort of reflector antenna Reflector Panel are laid a good foundation; According to the actual measurement electrical performance data of antenna reflection panel as objective function, use panel measured data as the source data of surface profile inverse model, ensure that the accuracy of method for designing Data Source; In modeling process, in effects on surface profile, the information of three kinds of different distributions forms carries out being separated rear inverting respectively, ensure that the accuracy of design process.
Accompanying drawing explanation
Fig. 1 is the general flow chart of method for designing of the present invention;
Fig. 2 is the sub-process figure that the present invention tests specimen surface data;
Fig. 3 is the surface profile irregular composition minimum parameter collection figure that inverting of the present invention obtains;
Fig. 4 is the surface profile mathematical model that the present invention reconstructs;
Fig. 5 is the reflector antenna emi analysis model that the present invention sets up;
Fig. 6 is antenna actual measurement electrical property and the comparison diagram emulating electrical property.
Embodiment
With reference to Fig. 1, the functional design method of the reflecting plane aerial panel based on profile inversion technique of the present invention, its Integral Thought is: the first Reflector Panel deformation experiment of design reflectivity surface antenna, make panel that obviously distortion occur, then the electrical property of reflector antenna is surveyed, obtain antenna actual measurement electrical performance indexes, again the Reflector Panel of reflector antenna is surveyed, obtain surface profile test data, then with antenna electric performance index for objective function, the characteristic parameter of inverting surface profile, set up the reflecting plane aerial panel model comprising surface profile information, realize the functional design of reflecting plane aerial panel.
Below in conjunction with specific embodiment, concrete introduction is done to the present invention.
In this specific embodiment, use a C/Ku wave band 3.7 meters of Cassegraio antennas, antenna main surface precision (RMS) is 0.45mm, reflecting surface material is aluminium, and thickness is 0.002m, and antenna reflective face is made up of 12 pieces of identical fan-shaped piecemeal panels, its back frame structure comprises 12 radiation beams, 1 cover ring beam and centrosome, wherein, every sheet radiation beam comprises 1 T-shaped beam and 2 L-type beams, and L-type beam plays and supports T-shaped beam action; Ring beam is L-type beam, is connected with Reflector Panel by bolt, and every block panel and L-type beam are fixed by 5 bolts, are fixed by 26 bolts with the T-shaped beam in radiation beam, and minor face is fixed on the junction of radiation beam and ring beam by 4 cylinder support legs.
Step 1: carry out deformation experiment to the Reflector Panel of reflector antenna, makes panel that obviously distortion occur
The process of deformation experiment is specific as follows:
Every block panel selects 13 bolts being arranged in reflecting surface and the T-shaped beam junction of radiation beam, and adds pad at bolt place, primary reflection surface panel is deformed.
Wherein, the pad used in experiment has three kinds of different thickness, is respectively S1=1.5mm, S2=2mm, S3=3mm.The Normal Displacement of pad for making reflecting surface Nodes produce 1.5mm, 2mm and 3mm respectively of three kinds of different-thickness.
Step 2: survey the electrical property of reflector antenna, obtains antenna actual measurement electrical performance indexes
The process of actual measurement electrical property is as follows:
(2a), keep minor face and feed constant, test antenna far-field pattern, obtains the actual measurement electrical performance indexes of antenna.
(2b), electrical performance indexes is selected to change one group of maximum shim size data as subsequent experimental data.
Step 3: survey the Reflector Panel of reflector antenna, obtains surface profile test data
With reference to Fig. 2, the process of the surface profile of actual measurement Reflector Panel is as follows:
(3a), according to panel deformation value select the metal probe contact pilotage of profile measurer, the radius of this contact pilotage is less than the half of the root-mean-square value of panel deformation amplitude.
(3b) sample length A and the evaluation length L of panel, is determined.
(3c), according to x to y to equidistant measuring route Uniform Scanning panel, obtain the surface profile test data of panel.
Step 4: the minimal characteristic parameter set setting up each composition information in surface profile
With reference to Fig. 3, the process setting up minimal characteristic parameter set is as follows:
(4a), linearity composition correlation parameter is the sign of the composition linearly changed in counter plate surface profile error measurement data, and can obtain the estimated value of linear dimensions by the method for linear regression, so, the expression formula of linearity composition is:
y
l(x)＝y
l0+s
lx (1)
In formula, y
l0for the intercept of linear segment, s
lfor slope.
The minimal characteristic parameter set characterizing linearity composition is:
L
e＝{y
l0,s
l} (2)。
(4b), cyclic component correlation parameter is the sign in cyclical variation composition in counter plate surface profile error measurement data, the estimated value of cyclic component correlation parameter can be obtained by the method for non-linear regression, so, the expression formula of cyclic component is:
y
p(x)＝y
p0+d
asin(2f
rx/L) (3)
Wherein, y
p0for side-play amount, d
afor amplitude, f
rfor frequency, L is sample length.
The minimal characteristic parameter set characterizing cyclic component is:
P＝{y
p0,d
a,f
r} (4)。
(4c), irregular composition correlation parameter be in counter plate surface profile error measurement data in non-periodic, nonrandom varying component sign, the estimated value of irregular composition correlation parameter can be characterized by fractal function, so, the expression formula of irregular composition is:
In formula, D is fractal dimension,
be the random initial phases position of each harmonic wave, b is scale factor, b>1, k
0space first-harmonic number,
amplitude controlling elements, R
afor root-mean-square height, M is most higher harmonics number.
Characterize irregular composition y
ix the minimal characteristic parameter set of () is:
I＝{D,C,m} (6)。
Step 5: with antenna electric performance index for objective function, the process of inverting surface profile mathematical model inverting surface profile mathematical model is as follows:
(5a), adopt the method effects on surface profile core parameter of minimization objective function to carry out inverting, for fractal dimension D in irregular composition, carry out the inverting of each composition characteristics parameter:
Target setting function is:
In formula, I
i(D) be time in surface profile irregular composition minimal characteristic parameter set, fractal dimension is D, the field intensity of the resultant field of antenna on certain measurement point, namely field intensity modulus value square; I
imeasure the intensity on the measurement point that obtains; K is the number of measurement point; If D
0for the fractal dimension of real surface roughness, then
(5b), adopt the method for minimization objective function to carry out inverting to each composition characteristics parameter, and set up the minimal characteristic collection of surface profile mathematical model:
By method described in step (5a), inverting is carried out to each composition characteristics parameter, sets up the minimal characteristic collection of surface profile mathematical model:
Ω＝L
e∪P∪I (8)
This minimal characteristic collection features the architectural feature of surface error, has reacted three kinds of meticulous compositions of surface profile.
(5c), in conjunction with minimal characteristic collection, applying equation (2), (4), (6) are finally inversed by panel surface profile mathematical model, and this mathematical model as shown in Figure 4.
Step 6: set up the reflector antenna finite element model comprising surface profile information
The process of establishing of finite element model is as follows:
(6a), use Ansys software, whole antenna structure finite element model is made up of 7569 nodes and 1237 unit, and wherein, unit comprises 252 beam elements and 985 shell units.
(6b), according to the related data applying pad described in step (2b), to single panel both sides 13 bolt point imposed loads selecting, obtain the Normal Displacement of Distorted Reflector Antenna panel.
(6c), from Ansys software derive displacement result, obtain the reflector antenna finite element model comprising surface profile information.
Step 7: set up reflector antenna emi analysis model, emulation obtains antenna emulation electrical performance indexes
The process of establishing of emi analysis model is as follows:
(7a), the reflector antenna finite element model set up in step (6) is imported electromagnetic analysis software HFSS11.0.
(7b), radiation border is set, excitation, calculates the unit for electrical property parameters of antenna.
(7c), choose the theoretical unit for electrical property parameters of antenna, this theoretical unit for electrical property parameters is antenna gain G and the first minor level FSLL.
The reflector antenna emi analysis model set up as shown in Figure 5.
Step 8: antenna is emulated electrical performance indexes and contrast with actual measurement electrical performance indexes
(1) if error meets accuracy requirement, then think that this method for designing is enough accurate, so, the functional design of reflecting plane aerial panel terminates.
(2) if error does not meet accuracy requirement, then step 2 is repeated to step 8, until meet accuracy requirement.
In the present embodiment, antenna actual measurement electrical property is shown in Fig. 6 with the comparing result of emulation electrical property.
Simulation result shows: based on the functional design method of the reflecting plane aerial panel of profile inversion technique, because it take into account the surface information comprising different distributions form in Practical Project in aerial panel surface profile information, so, with antenna electric performance index for objective function carries out the inverting of surface profile, significantly improve the precision of reflector antenna reflector design work.
Method for designing of the present invention can not only be used for the design effort of reflector antenna, and can also be used for the dull and stereotyped crack array antenna of microwave frequency band and the design effort of wave filter, has good application value.
It should be noted that, above-described embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection scope of the present invention.
Claims (9)
1., based on a functional design method for the reflecting plane aerial panel of profile inversion technique, it is characterized in that, comprise the following steps:
(1), to the Reflector Panel of reflector antenna carry out deformation experiment, make panel that obviously distortion occur;
(2), to the electrical property of reflector antenna survey, obtain antenna actual measurement electrical performance indexes;
(3), to the Reflector Panel of reflector antenna survey, obtain surface profile test data;
(4) the minimal characteristic parameter set of each composition information in surface profile, is set up;
(5), with antenna electric performance index for objective function, inverting surface profile mathematical model;
(6) the reflector antenna finite element model comprising surface profile information, is set up;
(7), set up reflector antenna emi analysis model, emulation obtains antenna emulation electrical performance indexes;
(8), by antenna emulate electrical performance indexes to contrast with actual measurement electrical performance indexes, if error meets accuracy requirement, then the functional design of reflecting plane aerial panel terminates; Otherwise, repeat step (2) to step (8), until meet accuracy requirement.
2. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 1, is characterized in that, in step (1), the process of the Reflector Panel of reflector antenna being carried out to deformation experiment is as follows:
Every block panel selects 13 bolts being arranged in reflecting surface and the T-shaped beam junction of radiation beam, and adds pad at bolt place, primary reflection surface panel is deformed.
3. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 2, it is characterized in that, described pad has three kinds of different thickness, be respectively S1=1.5mm, S2=2mm, S3=3mm, for the Normal Displacement making reflecting surface Nodes produce 1.5mm, 2mm and 3mm respectively.
4. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 3, is characterized in that, in step (2), the process of surveying the electrical property of reflector antenna is as follows:
(2a), keep minor face and feed constant, test antenna far-field pattern, obtains the actual measurement electrical performance indexes of antenna;
(2b), electrical performance indexes is selected to change one group of maximum shim size data as subsequent experimental data.
5. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 4, is characterized in that, in step (3), the process of surveying the Reflector Panel of reflector antenna is as follows:
(3a), according to panel deformation value select the metal probe contact pilotage of profile measurer, the radius of aforementioned contact pilotage is less than the half of the root-mean-square value of panel deformation amplitude;
(3b) sample length A and the evaluation length L of panel, is determined;
(3c), according to x to y to equidistant measuring route Uniform Scanning panel, obtain the surface profile test data of panel.
6. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 5, is characterized in that, in step (4), the process setting up the minimal characteristic parameter set of each composition information in surface profile is as follows:
(4a), linearity composition correlation parameter is the sign of the composition linearly changed in counter plate surface profile error measurement data, obtains the expression formula of linearity composition by the method for linear regression:
y
l(x)＝y
l0+s
lx (1)
In formula, y
l0for the intercept of linear segment, s
lfor slope,
The minimal characteristic parameter set characterizing linearity composition is:
L
e＝{y
l0,s
l} (2)
(4b), cyclic component correlation parameter is in the sign of cyclical variation composition in counter plate surface profile error measurement data, obtains the expression formula of cyclic component by the method for non-linear regression:
y
p(x)＝y
p0+d
asin(2f
rx/L) (3)
Wherein, y
p0for side-play amount, d
afor amplitude, f
rfor frequency, L is sample length,
The minimal characteristic parameter set characterizing cyclic component is:
P＝{y
p0,d
a,f
r} (4)
(4c), irregular composition correlation parameter be in counter plate surface profile error measurement data in non-periodic, nonrandom varying component sign, represent irregular composition by fractal function:
In formula, D is fractal dimension,
be the random initial phases position of each harmonic wave, b is scale factor, b>1, k
0space first-harmonic number,
amplitude controlling elements, R
afor root-mean-square height, M is most higher harmonics number,
Characterize irregular composition y
ix the minimal characteristic parameter set of () is:
I＝{D,C,m} (6)。
7. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 6, is characterized in that, in step (5), the process of inverting surface profile mathematical model is as follows:
(5a), the method effects on surface profile core parameter of minimization objective function is adopted to carry out inverting;
(5b), adopt the method for minimization objective function to carry out inverting to each composition characteristics parameter, and set up the minimal characteristic collection of surface profile mathematical model;
(5c), in conjunction with minimal characteristic collection, applying equation (2), (4), (6) are finally inversed by panel surface profile mathematical model.
8. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 7, is characterized in that, in step (6), sets up the process comprising the reflector antenna finite element model of surface profile information as follows:
(6a), use Ansys software, whole antenna structure finite element model is made up of 7569 nodes and 1237 unit, and described unit comprises 252 beam elements and 985 shell units;
(6b), according to the related data applying pad described in step (2b), to single panel both sides 10-15 bolt point imposed load selecting, obtain the Normal Displacement of Distorted Reflector Antenna panel;
(6c), from Ansys software derive displacement result, obtain the reflector antenna finite element model comprising surface profile information.
9. the functional design method of the reflecting plane aerial panel based on profile inversion technique according to claim 8, it is characterized in that, in step (7), set up reflector antenna emi analysis model and emulation obtain antenna emulation electrical performance indexes process as follows:
(7a), the reflector antenna finite element model set up in step (6) is imported electromagnetic analysis software HFSS11.0;
(7b), radiation border is set, excitation, calculates the unit for electrical property parameters of antenna;
(7c), choose the theoretical unit for electrical property parameters of antenna, aforementioned theoretical unit for electrical property parameters is antenna gain G and the first minor level FSLL.
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| CN105243226B (en) * | 2015-10-30 | 2018-09-28 | 西安电子科技大学 | LTCC materials microchannel manufactures the inverting optimization method of element |
| CN112329288A (en) * | 2020-10-28 | 2021-02-05 | 中国电子科技集团公司第五十四研究所 | Structure electromagnetic integration analysis method of reflector antenna |
| CN112329288B (en) * | 2020-10-28 | 2022-08-12 | 中国电子科技集团公司第五十四研究所 | Structure electromagnetic integration analysis method of reflector antenna |
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