CN110470914A - It is a kind of based on iterative Fourier transform algorithm without phase near field antenna measurements method - Google Patents
It is a kind of based on iterative Fourier transform algorithm without phase near field antenna measurements method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention belongs to high frequency antennas without phase near-field measurement technique field, disclose it is a kind of based on iterative Fourier transform algorithm without phase near field antenna measurements method, treated based on Typical Planar near field amplitude scanning technique and survey two plane of antenna near-field, two mutual quadrature components carry out probe acquisition；Based on near-field scan data, restored using phase of the iterative Fourier transform algorithm to scanning element position；Complex field is formed using the amplitude of retrieved phase and corresponding sampling point position, and acquires Antenna Far Field directional diagram using Near-far fields transfer.The present invention overcomes harsh to machinery positioning required precision in existing high frequency antenna near-field measurement technique, cost proliferation issues resulting from；Low-and high-frequency integrated measuring can be realized effectively with existing near field antenna measurements system docking.The present invention relates to the acquisitions of near region radiation field of aerial amplitude, the reduction of scanning element position phase, Near-far fields transfer technology, can be used for effectively being compatible with existing measuring system, can be used among high and low frequency near field antenna measurements.
Description
Technical field
The invention belongs to high frequency antennas to be become without phase near-field measurement technique field, more particularly to one kind based on iteration Fourier
Scaling method without phase near field antenna measurements method.
Background technique
Currently, the assessment of antenna performance can not be obtained in Antenna Design and manufacturing field, in early days with classical antenna measurement
Technology mainly use the scanning modes such as plane, spherical surface, cylinder obtain antenna near-field scanning element position amplitude and phase, and by
Extrapolation technique realizes that the given of Antenna Far Field directional diagram, earliest summary report see A.D.YAGHJW, but with antenna frequency
The continuous promotion of rate is gradually risen without phase near-field test technology nearly ten years, and no phase near field antenna measurements technology is being born
At the beginning of be exactly in order to solve the problems, such as that millimeter wave antenna measures, as Rocco Pierri et al. published thesis in 1999 in describe
As, in grade and submillimeter level near field antenna measurements, the acquisition of phase by probe position error, temperature and humidity variation,
The multifactor influence of transmission transposition precision and receiver stability etc. is often difficult to reach satisfactory result.Computational chart
Bright, the increase of phase noise can all be caused relative to faint the waving of tested antenna by popping one's head in high band, and actual test shows
When the test frequency of 100GHz, probe waves 0.001 inch of phase error that this may result in 3 degree, therefore the base station of scanning support
Construction is needed using stringent shock-absorbing, this needs special capital construction design to complete.On the other hand, the temperature in high-frequency test
Influence can not also live summary, the tiny temperature difference can generate 0001 inch of deformation easily, particularly with the test for being higher than 1000Hz,
Room temperature variation needs most dizzy control at ± 0.5 degree, and so high requirement undoubtedly improves the cost that darkroom is built and tested, and also increases
The uncertainty of difficulty of test and test result is added.Currently, both at home and abroad to the measurement of high frequency antenna still using improve darkroom and
Measuring system precision is achieved, and increases the positioning accuracy of scanning support, the stability etc. of lifting bracket system, but measure at
This will rise rapidly with the increase of frequency, and production and design accuracy will be unable to the frequency upgrading for meeting rapid development, therefore pass
High frequency antenna measurement of uniting does not have sustainable development characteristic.
In conclusion without phase near field antenna measurements technology, there are several significant deficiencies: firstly, from development feelings
Under condition, domestic and international mainstream darkroom (U.S. army's radar reflection laboratory, University of California's microwave dark room, Boeing's antenna measurement darkroom,
Xian Electronics Science and Technology University's microwave dark room, Southeast China University's microwave dark room etc.) all still using elevating mechanism precision and control temperature drift come
Realize high frequency antenna measurement, testing cost is very high, secondly, surveying in disclosed domestic and foreign literature to no phase near field antenna
The theoretical research of amount technology is very immature, and research preferably sees Sammi team, California, USA university and Xi'an electronics technology is big
Antenna institute is learned, but their research all and is not thorough, this is the weight for restricting no phase near field antenna measurements technology and carrying out and implementing
Bottleneck is wanted, phase retrieving algorithm efficiently and accurately is not temporarily effectively studied and implemented；Secondly, the mainstream of high frequency antenna measurement
Frequency range typically up to 40GHz, truly has the report (NASA target property darkroom etc.) of 60GHz frequency range measuring system both at home and abroad, but
Measurement cost is high, is unfavorable for universal and commercial；Again, in high band antenna measurement, wavelength is smaller, cause using probe according to
Half wavelength samples the given more difficult implementation of sample mode of rule, this is because the sampling interval too small causes sampling excessively close
Collection, unit length sample under distance, and the testing time is too long, so that the testing efficiency of system is low, meanwhile, the overstocked sampling interval
The research of system accuracy will be increased, in certain frequency ranges, theory of testing permissible accuracy will be unable to reach in reality.
In conclusion problem of the existing technology is:
(1) from the point of view of just disclosure is reported both at home and abroad at present, skill is restored to no phase near field antenna measurements technology, especially phase
The research of art is insufficient, is not thorough, it is theoretical caused by technical bottleneck cause no phase near field antenna measurements technology enter into it is practical into
It postpones slow.
(2) with the development of communication technology, the test frequency promotion of antenna has become main trend.It is measured in high frequency antenna
In, the requirement of positioning accuracy is further harsh, causes measurement cost to be obviously improved, or even in some frequency ranges, machining accuracy can not expire
Sufficient error requirement, meanwhile, as testing, step-length is too short to cause time of measuring too long, lower the efficiency of test macro, these
Factor causes traditional high frequency antenna measuring technique to be difficult the R&D work that duration supports high frequency antenna.High frequency is increased simultaneously
The research and development cost of antenna.
(3) in classical near field antenna measurements, in the case where not promoting positioning accuracy, due to the location error of probe, such as
Fruit carries out a degree of compensation to location error without using the phase retrieving algorithm in no phase near field measurement, then using existing
The Near-far fields transfer that data carry out will be unable to obtain satisfied Antenna Far Field directional diagram.
Solve above-mentioned technical problem difficulty: how using near field dual polarization scan amplitude data to scanning element position at
Phase is restored, and obtaining far field antenna antenna pattern using Near-far fields transfer algorithm is technical difficult points.
It solves the meaning of above-mentioned technical problem: effectively realizing the measurement of high frequency antenna low cost, relax to existing near-field scan
The required precision of equipment, realizes the acquisition of near-field scan data and efficiently utilizes, to provide a kind of high frequency day efficiently, inexpensive
Line measuring technology.The reduction for promoting high frequency antenna research and development cost promotes algorithm and the mode of test process height fusion near field
Application and popularization in antenna measurement.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of based on iterative Fourier transform algorithm without phase
Near field antenna measurements method.
The invention is realized in this way it is a kind of based on iterative Fourier transform algorithm without phase near field antenna measurements side
Method, it is described based on iterative Fourier transform algorithm without phase near field antenna measurements method the following steps are included:
The first step is treated based on Typical Planar near field amplitude scanning technique and surveys two plane of antenna near-field, two mutually orthogonal points
Amount carries out probe acquisition；
Second step is based on near-field scan data, is carried out using phase of the iterative Fourier transform algorithm to scanning element position
Reduction；
Third step forms complex field using the amplitude of retrieved phase and corresponding sampling point position, and uses Near-far fields transfer
Acquire Antenna Far Field directional diagram.
Further, the first step is based on Typical Planar near field amplitude scanning technique and treats survey two plane of antenna near-field, two
Biplane, the dual polarization near field antenna amplitude probe measurement that mutually orthogonal component carries out probe acquisition comprise the steps of:
(1) system warm-up, antenna installation to be measured are carried out, keeps Antenna aperture to be measured parallel with two-dimentional near-field scan plane, makes
With prescan measuring technology, the amplitude characteristic for measuring two quadrature paths determines antenna greatest irradiation direction, if antenna main beam
Direction at the center of near-field scan plane, is not then adjusted antenna；
(2) in scanning #1 and the #2 plane being parallel to each other at two, using identical sampling rule, rectangular mesh section is acquired
The polarized electric field amplitude information in the direction x and y on point position:
#1 plane:With
#2 plane:With
The sampling rule wherein referred to is Nyquist sampling thheorem:
The direction the x sampling interval meets:C is the light velocity, and f is measurement frequency；
The direction the y sampling interval meets:C is the light velocity, and f is measurement frequency.
Further, the second step is based on near-field scan data, using iterative Fourier transform algorithm to scanning element position
Phase carry out reduction setting antenna opening diametric plane, #1 the and #2 plane of scanning motion, and position be z=0, z=d1And z=d2, and it is flat to set #1
Face position tangential field amplitude isThe plan-position #2 tangential field amplitude isTwo mutual parallel plane z
=d1, z=d2Tangential field be also by Fourier transformation relationship together:
For z=d1Plane has:
For z=d2Plane has:
No matter near region the field distribution on any two different parallel planes is adopted, rebuilds identical Antenna Far Field directional diagram:
Further the process of phase reduction includes:
(1) number acquired on #1 the and #2 plane of scanning motion using linear polarization probe is extracted in the acquisition of biplane sample magnitude
According to being denoted as M respectively#1And M#2；
(2) the phase reduction of scanning element position carries out phase reduction and needs given primary iteration phase, to scanning element position
Phase restored；Use random phase as primary iteration phase, and using iterative Fourier transform technology to scanning element
The phase of position is restored；
Operation 1: pretreatment is randomly generated the phase value of #1 flat scanning point position in [- π, π], and with #1 plane
Sample magnitude constitutes primary iteration field
Operation 2: the measurement amplitude M of #1 plane is used#1Instead of complex fieldIn amplitude obtain the alternative field of #1 plane
Operation 3: the field distribution of #2 plane is calculated using formula:
Use measurement amplitude M#2SubstitutionAmplitude；
Operation 4: it usesAnd derive (n+1)th iteration field distribution that formula acquires #1 plane are as follows:
Meanwhile carrying out error calculation:
If error meets setting limit, or iterative process stops if reaching maximum number of iterations, otherwise, uses measurement
Amplitude M#1SubstitutionAmplitude, and return to operation and 2 continue.
Further, the third step forms complex field using the amplitude of retrieved phase and corresponding sampling point position, and uses
It includes: to obtain amplitude data and retrieved phase using sampling to may be constructed and sweep that Near-far fields transfer, which acquires Antenna Far Field directional diagram,
The complex field of described point position acquires the far-field pattern of antenna using this complex field combination Near-far fields transfer theory:
Then far-field pattern indicates are as follows:
Another object of the present invention is to provide described in one kind based on iterative Fourier transform algorithm without phase near field day
Application of the line measurement method in the acquisition of near region radiation field of aerial amplitude, the reduction of scanning element position phase, Near-far fields transfer.
Another object of the present invention is to provide described in one kind based on iterative Fourier transform algorithm without phase near field day
Application of the line measurement method in high and low frequency near field antenna measurements system.
In conclusion advantages of the present invention and good effect are as follows: present invention relates particularly near region radiation field of aerial amplitudes to adopt
Collection, the reduction of scanning element position phase, Near-far fields transfer technology, can be used for effectively being compatible with existing measuring system, can be used for high and low frequency
Among near field antenna measurements.The present invention is sampled for the purpose of solving high frequency antenna near field antenna measurements using biplane dual polarization
Strategy acquires the tangential electric field magnitude data on two parallel planes at rectangular mesh node location and uses iteration on this basis
Fourier Transform Algorithm restores the phase at a flat scanning point position, the plural number constituted using retrieved phase and amplitude
Field carries out Near-far fields transfer and obtains the far-field pattern of antenna.
The present invention is based on iterative Fourier transform algorithm, may be implemented high frequency antenna carried out in existing test macro it is low at
This is quick and precisely measured.Near-field Data service efficiency is improved simultaneously, the iterative process based on fast fourier transform algorithm, greatly
Data-handling efficiency is improved greatly.It can see from following table, the frequency of leading technical testing is generally on the left side 45GHz
The right side, it is extremely rare more than the test macro of 60GHz or more, in terms of positioning accuracy, positioning of the existing measuring system to probe
Precision is more harsh compared with the method for this patent, meanwhile, the know-how studies in China measured no phased antenna is less, due to dark
The limitation of room resource and research group, it is rarely seen to push actual no phase techniques to.
The progress contrast table of table 1
Detailed description of the invention
Fig. 1 be it is provided in an embodiment of the present invention based on iterative Fourier transform algorithm without phase near field antenna measurements method
Flow chart.
Fig. 2 be it is provided in an embodiment of the present invention based on iterative Fourier transform algorithm without phase near field antenna measurements method
Implementation flow chart.
Fig. 3 is experiment simulation schematic device provided in an embodiment of the present invention.
Fig. 4 is phase reduction technique algorithm flow chart provided in an embodiment of the present invention.
Fig. 5 is Near-far fields transfer theoretical validation result figure provided in an embodiment of the present invention；
In figure: (a) face E directional diagram compares；(b) face H directional diagram compares.
Fig. 6 is array provided in an embodiment of the present invention without phase near field measurement simulation result diagram；
In figure: (a) face E directional diagram compares；(b) face H directional diagram compares；(c) iteration error curve；(d) X center phase ratio
Compared with；(e) Y center phase compares.
Fig. 7 is influence diagram of the probe position error provided in an embodiment of the present invention to phase retrieving algorithm；
In figure: (a) variance is 0.1 iteration error curve graph；(b) variance is 0.2 iteration error curve graph；(c) interplanar
Away from 1.8, different variances influence.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
In view of the problems of the existing technology, the present invention provides a kind of based on iterative Fourier transform algorithm without phase
Near field antenna measurements method, is with reference to the accompanying drawing explained in detail the present invention.
As shown in Figure 1, surveying without phase near field antenna based on iterative Fourier transform algorithm provided in an embodiment of the present invention
Amount method the following steps are included:
S101: it is treated based on Typical Planar near field amplitude scanning technique and surveys two plane of antenna near-field, two mutual quadrature components
Carry out probe acquisition；
S102: near-field scan data are based on, are gone back using phase of the iterative Fourier transform algorithm to scanning element position
It is former；
S103: complex field is formed using the amplitude of retrieved phase and corresponding sampling point position, and is asked using Near-far fields transfer
Obtain Antenna Far Field directional diagram.
Technical scheme of the present invention will be further described with reference to the accompanying drawing.
As shown in Fig. 2, surveying without phase near field antenna based on iterative Fourier transform algorithm provided in an embodiment of the present invention
Amount method the following steps are included:
(1) biplane is carried out, dual polarization near field antenna amplitude probe measurement comprises the steps of:
(1.1) system warm-up, antenna installation to be measured are carried out, Antenna aperture to be measured (equivalent mouth face) and two-dimentional near-field scan are made
Plane is parallel, and prescan measuring technology can be used, measure the amplitude characteristic of two quadrature paths to determine antenna greatest irradiation side
To if antenna main beam direction is adjusted antenna not at the center of near-field scan plane.
(1.2) as shown in figure 3, (being set as #1 and #2 plane) on the plane of scanning motion being parallel to each other at two, use is identical
Sampling rule acquires the polarized electric field amplitude letter of two orthogonal directions (can be set as the direction x and y) on rectangular mesh node location
Breath, is denoted as:
#1 plane:With
#2 plane:With
The sampling rule wherein referred to is Nyquist sampling thheorem:
The direction the x sampling interval meets:C is the light velocity, and f is measurement frequency；
The direction the y sampling interval meets:C is the light velocity, and f is measurement frequency；
During Near-field Data sampling, general probe uses the radiating guide of corresponding frequency band, because its polarization purity is high,
And antenna pattern has analytic solutions, convenient for going probe to couple.In general antenna darkroom, scan path is top-down S
Broken line type track, data acquisition is to use vector network analyzer to acquire S21Based on, acquisition amplitude information is used only herein, though
Right vector network analyzer can obtain phase while obtaining amplitude, however in high band, the measurement of phase is often discontented with
Sufficient measurement accuracy demand.
(2) near-field scan data are based on, are restored using phase of the iterative Fourier transform algorithm to scanning element position
It comprises the steps of:
Antenna opening diametric plane, #1 the and #2 plane of scanning motion are set, and their position is z=0, z=d1And z=d2, and it is flat to set #1
Face position tangential field amplitude isThe plan-position #2 tangential field amplitude isIt is measured by traditional antenna
Theory is it is found that two mutual parallel plane z=d1, z=d2Tangential field be also by Fourier transformation relationship together, it may be assumed that
For z=d1Plane has:
For z=d2Plane has:
No matter near region the field distribution on any two different parallel planes is adopted, identical Antenna Far Field direction can be rebuild
Figure, then:
As shown in figure 4, the process of phase reduction has following key step:
1. the acquisition of biplane sample magnitude.Extract the number acquired on #1 the and #2 plane of scanning motion using linear polarization probe
According to being denoted as M respectively#1And M#2；
2. the phase of scanning element position restores.Phase reduction two big steps of main needs are carried out, first is that, give primary iteration
Phase, second is that, the phase of scanning element position is restored.Used here as random phase as primary iteration phase, and use
Iterative Fourier transform technology carries out reduction to the phase of scanning element position.
Operation 1: pretreatment is randomly generated the phase value of #1 flat scanning point position in [- π, π], and with #1 plane
Sample magnitude constitutes primary iteration field
Operation 2: the measurement amplitude M of #1 plane is used#1Instead of complex fieldIn amplitude obtain the alternative field of #1 plane
Operation 3: using the formula derived above, the field distribution of #2 plane can be calculated, it may be assumed that
It is similar with operation 2, use measurement amplitude M#2SubstitutionAmplitude；
Operation 4: it usesAnd derivation formula can be in the hope of (n+1)th iteration field distribution of #1 plane above are as follows:
Meanwhile carrying out error calculation:
If error meets setting limit, or iterative process stops if reaching maximum number of iterations, otherwise, uses measurement
Amplitude M#1SubstitutionAmplitude, and return to operation and 2 continue.
(3) complex field is formed using the amplitude of retrieved phase and corresponding sampling point position, and is acquired using Near-far fields transfer
Antenna Far Field directional diagram comprising the steps of:
Amplitude data is obtained using sampling and retrieved phase may be constructed the complex field of scanning element position, uses this
Complex field combination Near-far fields transfer theory acquires the far-field pattern of antenna, it may be assumed that
Then far-field pattern may be expressed as:
Technical effect of the invention is explained in detail below with reference to emulation.
One, simulated conditions: this emulation experiment is emulated using doublet array antenna, emulation frequency range be 30GHz, one
A minor level is the array antenna of -40dB, and in the direction x, points are 19 points, and current amplitude is according to cosine distribution, in the direction y point
Number is 19 points, and first spacing of shaking is 0.5 wavelength, and current amplitude is distributed according to Chebyshev, the phase of exciting current it is equal and
It is 0.
Two, emulation content and result
1 (such as Fig. 5) is emulated, acquires the tangential field amplitude and phase data in a plane near field, and carry out nearly far field change
It changes, it is good with theoretical calculation.
2 (such as Fig. 6) are emulated, the tangential field amplitude data in two planes is acquired near field, uses iterative Fourier transform skill
Art carries out phase reduction and Near-far fields transfer, phase and directional diagram are good with theoretical calculation.
3 (such as Fig. 7) are emulated, the tangential field amplitude data in two planes are acquired near field, on this basis, for adopting for probe
Sample position add normal state randomized jitter error, mean value 0, variance see as shown in the figure, using iterative Fourier transform technology into
The reduction of row phase and Near-far fields transfer, the results showed that, even there is the influence of the location error of probe, but with iterations going on
Error will be further reduced, and down to -30dB, this error meets the required precision of Near-far fields transfer near field measurement.
System performance is assessed by a series of experiment simulation, to close without phase under array antenna radiation event
Field antenna measurement technology is verified, at identical conditions, the comparing result of rarely seen open report, regardless of whether there is probe
Location error be added, error is gradually reduced in an iterative process, and is less than -30dB, meets near-field test demand, due to not
Phase acquisition is carried out, sample devices is simplified, and phase processing module is removed, and effectively reduces testing cost, therefore this hair
Bright applicability and accuracy is all higher, and simple for structure, good directionality antenna effect of the present invention is more preferable.
Carry out in antenna darkroom without phase near field antenna measurements, actual verification is carried out to above-mentioned emulation, as a result such as following table institute
Show.It will be clear that theoretical and actual measurement has the fitting added, either still rebuild in far-field pattern in retrieved phase
On have good precision.The reliability of the proposed method of this patent is demonstrated from experiment measurement.
2 measured result table of table
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. it is a kind of based on iterative Fourier transform algorithm without phase near field antenna measurements method, which is characterized in that it is described to be based on
Iterative Fourier transform algorithm without phase near field antenna measurements method the following steps are included:
The first step, based on Typical Planar near field amplitude scanning technique treat survey two plane of antenna near-field, two mutual quadrature components into
Row probe acquisition；
Second step is based on near-field scan data, is restored using phase of the iterative Fourier transform algorithm to scanning element position；
Third step is formed complex field using the amplitude of retrieved phase and corresponding sampling point position, and is acquired using Near-far fields transfer
Antenna Far Field directional diagram.
2. as described in claim 1 based on iterative Fourier transform algorithm without phase near field antenna measurements method, feature
It is, the first step is based on Typical Planar near field amplitude scanning technique and treats survey two plane of antenna near-field, two mutually orthogonal points
Biplane, the dual polarization near field antenna amplitude probe measurement that amount carries out probe acquisition comprise the steps of:
(1) system warm-up, antenna installation to be measured are carried out, keeps Antenna aperture to be measured parallel with two-dimentional near-field scan plane, using pre-
Scan testing techniques, the amplitude characteristic for measuring two quadrature paths determines antenna greatest irradiation direction, if antenna main beam direction
Not at the center of near-field scan plane, then antenna is adjusted；
(2) in scanning #1 and the #2 plane being parallel to each other at two, using identical sampling rule, rectangular mesh node position is acquired
The polarized electric field amplitude information in the direction x and y set:
#1 plane:With
#2 plane:With
The sampling rule wherein referred to is Nyquist sampling thheorem:
The direction the x sampling interval meets:C is the light velocity, and f is measurement frequency；
The direction the y sampling interval meets:C is the light velocity, and f is measurement frequency.
3. as described in claim 1 based on iterative Fourier transform algorithm without phase near field antenna measurements method, feature
It is, the second step is based on near-field scan data, is carried out using phase of the iterative Fourier transform algorithm to scanning element position
Reduction setting antenna opening diametric plane, #1 the and #2 plane of scanning motion, and position is z=0, z=d1And z=d2, and it is tangential to set the plan-position #1
Amplitude isThe plan-position #2 tangential field amplitude isTwo mutual parallel plane z=d1, z=d2
Tangential field be also by Fourier transformation relationship together:
For z=d1Plane has:
For z=d2Plane has:
No matter near region the field distribution on any two different parallel planes is adopted, rebuilds identical Antenna Far Field directional diagram:
4. as claimed in claim 3 based on iterative Fourier transform algorithm without phase near field antenna measurements method, feature
It is, the process of further phase reduction includes:
(1) data acquired on #1 the and #2 plane of scanning motion using linear polarization probe are extracted in the acquisition of biplane sample magnitude, point
M is not denoted as it#1And M#2；
(2) the phase reduction of scanning element position carries out phase reduction and needs given primary iteration phase, to the phase of scanning element position
Position is restored；Use random phase as primary iteration phase, and using iterative Fourier transform technology to scanning element position
Phase restored；
Operation 1: the phase value of #1 flat scanning point position, and the sampling with #1 plane is randomly generated in pretreatment in [- π, π]
Amplitude constitutes primary iteration field
Operation 2: the measurement amplitude M of #1 plane is used#1Instead of complex fieldIn amplitude obtain the alternative field of #1 plane
Operation 3: the field distribution of #2 plane is calculated using formula:
Use measurement amplitude M#2SubstitutionAmplitude；
Operation 4: it usesAnd derive (n+1)th iteration field distribution that formula acquires #1 plane are as follows:
Meanwhile carrying out error calculation:
If error meets setting limit, or iterative process stops if reaching maximum number of iterations, otherwise, uses measurement amplitude
M#1SubstitutionAmplitude, and return to operation and 2 continue.
5. as described in claim 1 based on iterative Fourier transform algorithm without phase near field antenna measurements method, feature
It is, the third step forms complex field using the amplitude of retrieved phase and corresponding sampling point position, and uses Near-far fields transfer
Acquiring Antenna Far Field directional diagram includes: that may be constructed scanning element position using sampling acquisition amplitude data and retrieved phase
Complex field acquires the far-field pattern of antenna using this complex field combination Near-far fields transfer theory:
Then far-field pattern indicates are as follows:
6. a kind of surveying without phase near field antenna based on iterative Fourier transform algorithm as described in Claims 1 to 5 any one
Application of the amount method in the acquisition of near region radiation field of aerial amplitude, the reduction of scanning element position phase, Near-far fields transfer.
7. a kind of surveying without phase near field antenna based on iterative Fourier transform algorithm as described in Claims 1 to 5 any one
Application of the amount method in high and low frequency near field antenna measurements system.
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| CN115902430A (en) * | 2023-01-09 | 2023-04-04 | 北京航空航天大学 | Aperture antenna plane near field measurement method and system, electronic equipment and medium |
| CN116381361A (en) * | 2023-03-24 | 2023-07-04 | 西安电子科技大学 | Plane near-field antenna directional diagram measuring device and measuring method thereof |
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