CN105203562A - Testing system for insertion phase delay of frequency selection material and testing method thereof - Google Patents
Testing system for insertion phase delay of frequency selection material and testing method thereof Download PDFInfo
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- CN105203562A CN105203562A CN201510549302.9A CN201510549302A CN105203562A CN 105203562 A CN105203562 A CN 105203562A CN 201510549302 A CN201510549302 A CN 201510549302A CN 105203562 A CN105203562 A CN 105203562A
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Abstract
The invention provides a testing system for insertion phase delay of a frequency selection material and a testing method thereof. The system comprises a vector network analyzer, a 30dB attenuator, a powder divider, a receiver, two pairs of horn antennas and a data processing module; one output port of the vector network analyzer is connected with the transmitting horn antenna, the other output port of the vector network analyzer is connected with one input end of the power divider through the 30 dB attenuator, the other input end of the power divider is connected with the receiving antenna, the output end of the power divider is connected with the receiver, and two ways of signals are combined through the power divider and then output to the receiver; the data processing module is used for forming power testing data collected by the receiver into cosine curves and comparing the cosine curves before and after the frequency selection material is inserted to obtain insertion phase delay of the frequency selection materials at a test frequency point. According to the method, a cosine fitting method of the cosine curves is presented to achieve phase measuring with the high precision and stability on the basis of a testing system model by combining a data processing technology.
Description
Technical field
The invention belongs to electromagnetic material research field, with the application trend of frequency material selection radome for background, be specifically related to a kind of material selection insertion phase delayed test system and method for testing thereof frequently.
Background technology
Frequency-selective surfaces (Frequencyselectivesurface, be called for short FSS) the single or multiple lift periodic array arrangement that be made up of by certain arrangement mode passive resonance unit (metal patch or aperture) of compound substance, is called for short frequency material selection.Its frequency selectivity comes from its periodic structure and electromagnetic interaction, and when the resonant frequency point of incident wave frequency close to paster or aperture, FSS shows incident wave total reflection or total transmissivity characteristic.This to incident wave total reflection and the characteristic of total transmissivity just, frequency-selective surfaces was obtained at microwave and optical field and applies widely.Frequently material selection is mainly used in electromagnetism stealth field, and utilize the logical frequency selective characteristic of band to prepare radome or various radome structure, in radar working frequency range, it has good wave penetrate capability, does not affect antenna and normally works.And beyond working frequency range, frequently select radome to be equivalent to a total reflection metal cap, utilize special low radar scattering cross section version, enemy radar wave dispersion is mapped to all directions.
Research for frequency material selection is usually confined to the impact of the factors such as dielectric thickness, load mode, specific inductive capacity on basic electric property energy such as resonance frequency transmission bandwidth, losses.And insertion phase postpones (Insertionphasedelay, IPD) for frequency material selection, be the technical indicator of equal importance with wave transmission rate, closely related with pointing error.Frequently material selection insertion phase postpones (IPD) is the difference of stealth radar antenna house relative to the phase delay of vacuum electric wave traveling, and the measurement of transmission characterist function of vector network analyzer can be utilized in theory to measure.Retrieval domestic and foreign literature, still belongs to blank about the insertion phase delay testing method of frequency material selection and data processing method.
Be limited to manufacturing process and the cycle of material selection antenna house frequently, online matching measurement for a long time to be carried out to IPD in process, have high requirement to Measurement sensibility degree and phase resolution, higher Measurement sensibility degree and phase resolution mean higher processing and manufacturing precision.
Summary of the invention
The problem to be solved in the present invention is, for prior art above shortcomings, provides a kind of material selection insertion phase delayed test system and method for testing thereof frequently, realizes high precision insertion phase delay measurements by phase curve cosine approximating method.
The present invention solve the problem adopt technical scheme be:
A kind of delayed test of material selection insertion phase frequently system, comprise vector network analyzer, 30dB attenuator, power splitter, receiver, two secondary electromagnetic horn and data processing modules, an output port of described vector network analyzer is connected with transmitting electromagnetic horn, another output port is connected with an input end of power splitter through 30dB attenuator, another input end of power splitter is connected with reception electromagnetic horn, the output terminal of power splitter is connected with receiver, and two paths of signals exports receiver to after power splitter synthesis; The power test data that described data processing module is used for receiver to gather form cosine curve, and are compared by the cosine curve inserted before and after frequency material selection, obtain material selection frequently and postpone at the insertion phase of test frequency.
By such scheme, described vector network analyzer adopts the PNA-x vector network analyzer of Agilent company.
Present invention also offers a kind of method of testing based on above-mentioned frequency material selection insertion phase delayed test system, comprise the steps:
(1) guarantee that the position of two of test macro in process of the test secondary electromagnetic horns immobilizes;
(2) the two-port amplitude output signal adjusting vector network analyzer is identical, and signal is the phase differential of setting, and uses oscillograph to monitor the coherent signal (ensureing the precision of amplitude and phase differential) of vector network analyzer output;
(3) before frequency material selection does not insert electromagnetic horn, the two-way phase of output signal arranging vector network analyzer is poor, phase shift at equal intervals from 0 °, power test data are gathered by receiver, sampled point reaches certain density, and reaching a phase shift all after date stoppings collection, record inserts the test data before frequency material selection;
(4) frequency material selection to be installed by the attitude that operating mode is determined and between the two secondary electromagnetic horns inserting test macro, the two-way phase of output signal repeating to arrange in step (3) vector network analyzer is poor, phase shift at equal intervals from 0 °, gather power test data by receiver, record inserts the power test data after frequency material selection;
(5) the power test data being dBmW by the unit before and after the insertion of record in step (3) and (4) frequently material selection are converted to the linear power value that unit is mW, then import in data processing module;
(6) the cosine matching based on least square method is carried out to the linear power value in step (5), form the cosine curve of comparatively standard, the cosine curve inserted before and after frequency material selection is compared, obtain material selection frequently to postpone at the insertion phase of test frequency, linear power value directly shows on the interface of data processing module.
By such scheme, in described step (3), the span in phase shift cycle is 0 ~ 360 °, and interval is less than or equal to 5 ° (sample interval is less, and test result is more accurate).
The present invention has following beneficial effect: based on the principle model replacing Direct Phase to measure with amplitude measurement, the prioritization scheme of insertion phase delay measurements is proposed, and carry out the coherence's design testing branch road, simultaneously in conjunction with data processing technique, the cosine approximating method proposing phase curve to realize the phase measurement of high precision and high stability, for the analysis of frequency material selection radome electrical property and assessment provide means.
Accompanying drawing explanation
Fig. 1 is the test philosophy figure of the present invention's frequency material selection insertion phase delayed test system;
Fig. 2 is the resultant vector trajectory diagram under two-way of the present invention output signal out of phase angle;
Fig. 3 is two-way output signal insertion phase delayed test Vector modulation schematic diagram in Fig. 2;
Fig. 4 is the test arrangenent diagram of the present invention's frequency material selection insertion phase delayed test system;
Fig. 5 is that the cosine curve of the present invention's frequency material selection insertion phase delayed test data compares interface and the result figure.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further described.
With reference to shown in Fig. 1 ~ Fig. 4, frequency material selection insertion phase delayed test system of the present invention, comprise 1 vector network analyzer, 1 30dB attenuator, 1 power splitter, receiver, transmitting electromagnetic horn, reception electromagnetic horn and a data processing module, an output port of described vector network analyzer is connected with transmitting electromagnetic horn, another output port is connected with an input end of power splitter through 30dB attenuator, another input end of power splitter is connected with reception electromagnetic horn, and two paths of signals exports receiver to after power splitter synthesis; The power test data that described data processing module is used for receiver to gather form cosine curve, and are compared by the cosine curve inserted before and after frequency material selection, obtain material selection frequently and postpone at the insertion phase of test frequency.Launch electromagnetic horn, reception electromagnetic horn is double-ridged horn antenna AT4418, each composition configuration of test macro is as shown in table 1.
Table 1 is the configuration of material selection IPD test-meter frequently
The present invention establishes the frequency material selection insertion phase delayed test model replacing Direct Phase to measure with amplitude measurement, and is tested by signal coherency, improves measuring stability; The core of insertion phase delay measurements obtains material selection frequently to exist with electromagnetic wave phase place transmission delay differences when not existing different, and the frequency material selection insertion phase delayed test principle after being optimized based on multiport network method of testing as shown in Figure 1.In figure, detection port 3 place is power meter, represents the two-way amplitude output signal of transmission with A, B, and the detection power expression formula of measurement is:
Visible, when A, B two-way amplitude output signal is constant, relatively different phase place angles
resultant vector track is the circle in the complex plane shown in Fig. 2, and the AC compounent of detection power P is proportional to phase place angle
cosine.Phase place angle
postponed to form with the insertion phase that the proper phase difference of direct signal path 1-3 superposes material selection frequently again by measuring-signal path 1-4-5-3.Utilize step phase shifter to change circuit state N, detection port 3 will obtain power detection value P successively
n, carry out cosine matching, obtain the phase place of matched curve relative to step phase shifter particular state sequence.The effect that insertion phase postpones is equivalent to the phase shift of matched curve, therefore, based on same step phase shifter particular state sequence, just can obtain material selection frequently and insert Vector modulation angular difference before and after electromagnetic horn
this difference is exactly the frequency material selection insertion phase length of delay recorded, as shown in Figure 3.
Design experiment is arranged as shown in Figure 4, with reference to test philosophy Fig. 1, need change A, B two paths of signals phase differential, because Digital Microwave step phase shifter repeatability is poor, and phase accuracy 3 ° ~ 5 °, amplitude 1dB ~ 1.5dB, may cause test result comparatively big error.The present invention selects Agilent company vector network analyzer PNA-xN5242A, can provide that two-way amplitude is identical, the coherent signal of phase-adjustable simultaneously, ensures measuring accuracy while simplifying System's composition.At the straight-through branch road serial connection 30dB attenuator of vector network analyzer, to ensure that two paths of signals amplitude is suitable, improve data processing precision.
The insertion phase delayed test system of the present invention's design is with amplitude test replacement phase test, to a certain degree improve measuring accuracy, but network analyzer two paths of signals phase place, range error and power meter test error will cause test sample point cannot be connected to become desirable cosine curve in system, then need to carry out matching by data processing method, the present invention adopts the test data cosine approximating method based on least square method, improves insertion phase delayed test precision further.
The curve ExpressVI that the cosine matching of insertion phase delayed test directly uses LabVIEW to carry has come, and preference pattern type is generalized linear least-squares estimation, and the objective function according to the power expression Modling model of detection port 3 is:
y＝acos(Φ)+b(2)
Wherein, y is the power sequence that detection port 3 (power meter) measures, and b is the DC component of detection power P, namely in power expression (1) | A|
2+ | B|
2, the AC compounent that acos (Φ) is detection power P, and be proportional to the cosine of angle Φ, a is the 2|A||B| in power expression (1).
Set up two vector A and B, represent A, B two-way output signal respectively, the value of A and B is stochastic inputs, | A| and | B| represents the mould of vector A and B respectively, the span of phase place Φ is 0 ~ 360 °, is spaced apart 5 °, according to power expression (1) the generating power P ' of detection port 3, then add white Gaussian noise, form final detection power P; Then use curve matching ExpressVI carries out curve fitting; Finally be normalized again, remove a and b, obtain final angle
cosine curve.
In actual test process, data after first testing acquisition one group of normalization when not inserting frequency material selection, and then insert material selection frequently, obtain the data after other one group of normalization according to identical flow process, postpone at the insertion phase asking the phase difference value at two groups of identical amplitude places of data can obtain material selection frequently.
Using certain S-band frequency material selection as tested object, by test system building in accompanying drawing 4, IPD test under 4GHz frequency carries out frequency material selection plumbness, final detection power P value is as shown in the raw-data map of left column in Fig. 5, then use curve matching ExpressVI carries out curve fitting, and the optimum fit curve obtained, as shown in optimum fit curve figure middle in Fig. 5, is finally normalized again, remove a and b, obtain final angle
cosine curve, as shown in the normalized curve figure of row right in Fig. 5, it is 18.63 ° that the insertion phase obtaining testing postpones result, is less than 1 ° with design of Simulation results contrast error, demonstrates the accuracy of IPD method of testing and validity that the present invention proposes.
Should be understood that above-described embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and do not depart from the spirit and scope of technical solution of the present invention, and it all should be encompassed in right of the present invention after the content of having read the present invention's instruction.
Claims (4)
1. a frequency material selection insertion phase delayed test system, it is characterized in that: comprise vector network analyzer, 30dB attenuator, power splitter, receiver, two secondary electromagnetic horn and data processing modules, an output port of described vector network analyzer is connected with transmitting electromagnetic horn, another output port is connected with an input end of power splitter through 30dB attenuator, another input end of power splitter is connected with reception electromagnetic horn, the output terminal of power splitter is connected with receiver, and two paths of signals exports receiver to after power splitter synthesis; The power test data that described data processing module is used for receiver to gather form cosine curve, and are compared by the cosine curve inserted before and after frequency material selection, obtain material selection frequently and postpone at the insertion phase of test frequency.
2. the delayed test of material selection insertion phase frequently system as claimed in claim 1, is characterized in that: described vector network analyzer adopts the PNA-x vector network analyzer of Agilent company.
3., based on a method of testing for one of any described frequency material selection insertion phase delayed test system of the claims 1 ~ 2, comprise the steps:
(1) guarantee that the position of two of test macro in process of the test secondary electromagnetic horns immobilizes;
(2) the two-port amplitude output signal adjusting vector network analyzer is identical, and signal is the phase differential of setting, and uses oscillograph to monitor the coherent signal of vector network analyzer output;
(3) before frequency material selection does not insert electromagnetic horn, it is poor that vector network analyzer two-way phase of output signal is set, phase shift at equal intervals from 0 °, power test data are gathered by receiver, sampled point reaches certain density, and reaching a phase shift all after date stoppings collection, record inserts the test data before frequency material selection;
(4) frequency material selection to be installed by the attitude that operating mode is determined and between the two secondary electromagnetic horns inserting test macro, repeat that in step (3), vector network analyzer two-way phase of output signal is set poor, phase shift at equal intervals from 0 °, gather power test data by receiver, record inserts the power test data after frequency material selection;
(5) the power test data being dBmW by the unit before and after the insertion of record in step (3) and (4) frequently material selection are converted to the linear power value that unit is mW, then import in data processing module;
(6) the cosine matching based on least square method is carried out to the linear power value in step (5), form the cosine curve of comparatively standard, the cosine curve inserted before and after frequency material selection is compared, obtain material selection frequently to postpone at the insertion phase of test frequency, linear power value directly shows on the interface of data processing module.
4. the delay testing method of material selection insertion phase frequently as claimed in claim 3, is characterized in that: in described step (3), the span in phase shift cycle is 0 ~ 360 °, and interval is less than or equal to 5 °.
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| CN107817392A (en) * | 2016-09-12 | 2018-03-20 | 罗德施瓦兹两合股份有限公司 | For the system and method for the characteristic for characterizing multiple element antenna |
| CN109374990A (en) * | 2018-12-03 | 2019-02-22 | 北京无线电计量测试研究所 | A kind of antenna phase center calibration method |
| CN109417229A (en) * | 2016-05-20 | 2019-03-01 | 集美塔公司 | Free space portion tester |
| CN110749801A (en) * | 2018-07-06 | 2020-02-04 | 中国航空工业集团公司济南特种结构研究所 | Dynamic test device and test method for electrical thickness of radome |
| CN111929508A (en) * | 2020-07-16 | 2020-11-13 | 中国电子科技集团公司第四十一研究所 | Electric thickness information extraction method and device capable of resisting environmental drift |
| CN112034406A (en) * | 2020-08-26 | 2020-12-04 | 中国航空工业集团公司济南特种结构研究所 | Phase calibration method for portable electrical thickness tester |
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| CN110749801A (en) * | 2018-07-06 | 2020-02-04 | 中国航空工业集团公司济南特种结构研究所 | Dynamic test device and test method for electrical thickness of radome |
| CN109374990A (en) * | 2018-12-03 | 2019-02-22 | 北京无线电计量测试研究所 | A kind of antenna phase center calibration method |
| CN111929508A (en) * | 2020-07-16 | 2020-11-13 | 中国电子科技集团公司第四十一研究所 | Electric thickness information extraction method and device capable of resisting environmental drift |
| CN111929508B (en) * | 2020-07-16 | 2022-12-27 | 中国电子科技集团公司第四十一研究所 | Electric thickness information extraction method and device capable of resisting environmental drift |
| CN112034406A (en) * | 2020-08-26 | 2020-12-04 | 中国航空工业集团公司济南特种结构研究所 | Phase calibration method for portable electrical thickness tester |
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Application publication date: 20151230 |