CN107192902A - A kind of cable conducted susceptibility waving map method using many Gaussian pulses - Google Patents
A kind of cable conducted susceptibility waving map method using many Gaussian pulses Download PDFInfo
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Abstract
The present invention relates to a kind of cable conducted susceptibility waving map method using many Gaussian pulses, following steps are specifically included：Step 1: analyzing many Gaussian pulse spectrums；Step 2: design sensitive frequency positioning flow；Step 3: realizing positioning flow using LABVIEW.The present invention discloses the cable conducted susceptibility Time-Domain Measuring System that methods described is applied, including time domain impulse shaping module, injection probe module, test item and signal monitoring and the part of data processing module four.The inventive method advantage is：1st, being capable of analog machine is faced in real work well complex electromagnetic environment；2nd, interference signal form that may be present can comprehensively be reflected；3rd, many Gaussian pulses belong to broadband time-domain signal, and test frequency spectrum is wide, and testing efficiency is high, and the sensitive frequency distribution situation of test item can be comprehensively examined relatively；4th, automatic test is realized by LABVIEW, operated simpler；5th, testing efficiency is drastically increased, the testing time has been saved.
Description
Technical field
The present invention relates to a kind of cable conducted susceptibility waving map method using many Gaussian pulses, belong to electromagnetic susceptibility
Spend testing field.Cable conducted susceptibility waving map uses many Gaussian pulses as broadband time-domain test signal, selects a variety of
Many Gaussian pulses inject test item, and the sensitive frequency of test item is measured using the diversity of its frequency spectrum, survey is drastically increased
Efficiency is tried, with wide utilization prospect.
Background technology
The test of cable conducted susceptibility occupies the status of key in electromagnetic compatibility test.In large complicated electronic system
Number of cables is huge, species is various, widely distributed, therefore various cables can pick up electromagnetic energy from actual working environment, when
When external electromagnetic field is irradiated to cable, cable will collect electromagnetic energy, and noise coupling is entered in cable.It is coupled into cable
Noise may produce transient current and potential conduction is coupled in the terminal electronic device being connected with cable or system, make terminal
There is sensitivity in circuit in electronic equipment or system, and this is likely to result in destructive to more sensitive electronic device and circuit
Destruction.A large amount of statistics show：During current large scale electronic equipment emc issue the most universal inducement is exactly equipment
Electromagnetic interference signal in interconnection cable coupling actual working environment, therefore line in all directions is carried out to the interconnection cable in equipment
Cable sensitivity testing is very necessary and urgent, and the reliability to raising equipment is even more vital.
The project examined in current electromagnetic compatibility test to cable susceptibility mainly note by the conduction including frequency domain scan-type
Enter time domain sensitivity testing (static discharge, the surge of sensitivity testing (CS114 etc.) and the coupling injection of particular form pulse signal
Deng), to antenna terminal nonlinear effect certification test (CS103/CS104/CS105).With electronic installation function increasingly
It is many, load electronic device it is more and more, number of cables, species, length, tie up mode, layout become increasingly complex.Above-mentioned line
Cable conducted susceptibility test method is changed in efficiency and not can not gradually meet large-scale and complicated device in terms of test item state
Emc testing demand.For example when implementing the sensitivity testing of frequency domain scan-type, such as in strict accordance with equipment subsystem level
The test frequency range of defined, stepping requirement and testing procedure implement experiment in national military standard, and single test often takes 1~2 hour.
The device containing large amount of complex cable is tested using this experiment, it will expend immeasurable time cost, prolong significantly
Miss the lead time of equipment.Simultaneously in existing experiment CS114 Injection Signals be single-frequency point using frequency domain scan by the way of pair
Test item is tested, and whether the frequency band between so adjacent test frequency has sensitive frequency to be just difficult to measure, it is possible that
Leak frequency situation.
The concept of time domain electromagnetic Interference Detection is proposed by E.L.Bronaugh earliest, according to the document point published at present
Analysis, the research prototype in laboratory can be accomplished to meet CISPR wanting on electromagnetic interference receiver in below 18GHz frequency ranges
Ask.In September, 2012, German R＆S companies release a time domain EMI test receiver ESR, can enter in the range of 10Hz-7GHz
Row conduction and EMC emission test, the ESR have the time domain scan function based on FFT, electromagnetism can be carried out at a terrific speed and disturbed
Measurement is disturbed, is that user saves valuable time.In addition, this method of testing is very suitable for automobile, mobile communication, medical treatment, electricity
The industry such as power and illumination.In APEMC meetings in 2012, time domain electromagnetic interference receiver is pushed away as a special theme
Go out, discussed for everybody.Munich, Germany polytechnical university professor P.Russer has made entitled " EMC Measurements in the
Time-Domain " report, has led a dramatic change in terms of time domain electromagnetic disturbed test.
The content of the invention
1st, purpose：It is an object of the invention to provide a kind of cable conducted susceptibility waving map using many Gaussian pulses
Method.Residing electromagnetic environment signal form complexity is various in the course of the work for electronic equipment, more with time domain broadband signal form
In the presence of so selection time domain broadband signal can be under conditions of tested device state not be changed to greatest extent as test signal
The real operating environments of test item are simulated, the electromagnetic susceptibility phenomenon being likely to occur under its real operating environments is inspired.The present invention
Using many Gaussian pulses as broadband time-domain test signal, using many Gaussian pulse spectrums are wide, spectrum distribution scope afterpulsing
The characteristics of spacing changes, injects test item by test signal successively and excites the sensitive of test item to respond, be tested by comprehensive analysis
The sensitive situations of product and the frequency spectrum of input test signal, accurately measure the sensitive frequency distribution of test item.Cable conducts
Susceptibility waving map can make up the deficiency of traditional measurement method, improve testing efficiency, also substantially reduce the testing time.
2nd, technical scheme：The conducted susceptibility Time-Domain Measuring System of the present invention uses single Gauss that full bottom pulsewidth is 0.5ns
Pulse, double gauss pulse and Gauss even pulse are as test signal, by many Gaussian pulses for selecting the different spacing of multi-form
To determine the sensitive frequency distribution of test item, it is desired to which the scope of measurement is 0~800MHz.Conducted susceptibility waving map system
System forms circuit by time domain impulse, and injection probe, test item, four parts of signal acquisition and data analysis are constituted.Pulse shaping
Circuit can produce single Gaussian pulse, double gauss pulse and the Gauss even pulse of different spacing as requested.Test signal passes through
Injection probe is coupled on test item, and test item produces sensitive response to the signal of injection, and injection probe should ensure that in test model
Enclose interior injection flatness, it is ensured that test signal can completely be injected.Signal acquisition and data analysis component gather test item
Sensitivity response, extracts corresponding characteristic information, judges whether test item produces sensitive and selected according to sensitive frequency location algorithm
Next test pulse, driving pulse formation circuit produces new test pulse.Run by hardware above, system can basis
The location algorithm of sensitive frequency progressively determines the distribution of the sensitive frequency of test item.
The present invention devises complete sensitive frequency positioning flow, and the flow is used for the sensitive response letter for analyzing test item
Number, sensitive information is extracted, judges whether test item occurs sensitivity, further selects generation suitable with reference to sensitive frequency location algorithm
Test pulse injection test item, progressively determine sensitive frequency distribution.The core of flow chart of data processing is to be based on time domain
The sensitive frequency location algorithm of Gaussian pulse signal.
A kind of cable conducted susceptibility waving map method using many Gaussian pulses, is characterised by：Specifically include following
Content：
(1) many Gaussian pulse spectrums are analyzed
Using many Gaussian pulses as sensitive frequency waving map signal, first have to analyze the spectrum distribution of many Gaussian pulses
Rule, observes the spectrum distribution of many Gaussian pulses and the relation of pulse distance；
Gaussian monopulse time-domain expression is：Wherein A is amplitude, μ and σ2For
The expectation of Gaussian function and standard variance, the Gaussian pulse of same distribution and the signal energy distribution being distributed in Gaussian function are basic
Identical, both frequency distribution are also approximate, so coming the spectrum distribution of approximate Gaussian pulse, Gauss using the frequency spectrum of Gaussian function
Pulse spectrum expression formula is：B is spectrum amplitude in formula, and the formula shows to choose suitable threshold value, Gauss
The spectrum distribution of pulse approximately can be regarded as Gaussian Profile；
Using above-mentioned analysis result, with reference to the time shift characteristic of Fourier transformation, the frequency spectrum point of many Gaussian pulses can be obtained
Cloth situation；Assuming that the spacing of double gauss pulse is T, then amplitude spectrum expression formula is：Double gauss
Spectrum component of the pulse in -3dB can be effectively injected test item, be Validity Test frequency band, Validity Test frequency band border ωbd
Relational expression with pulse distance T is：The test signal that this method is used is that full bottom pulsewidth is
0.5ns many Gaussian pulses, the form parameter σ ≈ 1.4 × 10 of now pulse-11；Due to σ ≈ 1.4 × 10-11Simultaneously have ω≤
800MHz, so havingThe Validity Test frequency band border of double gauss pulse and the relation of pulse distance can simplify
For cos ωbdT=0；The Validity Test frequency band border ω of double gauss pulsebdThere are multiple solutions, sensitive frequency location algorithm is integrated
The Validity Test frequency band distribution of double gauss pulse is analyzed, first choosing suitable pulse distance makes the Validity Test frequency of double gauss pulse
Band is only [0, ωbd0], it can be realized to [0, ω by the spacing for changing double gauss pulsebd0] sector scanning, determine test item
It is distributed in the sensitive frequency of low frequency region；
Using same analysis method, Gauss even pulse amplitude spectrum expression formula is：With
Double gauss pulse computational methods are identical, obtain the boundary value of Gauss even pulse Validity Test frequency band and pulse distance T relation table
It is up to formula：cosωbeT=0；The Validity Test frequency band of the pulse of pulse distance identical double gauss and Gauss even pulse as can be seen here
Critical point is identical, and the covering that both combine can completely requires the 0~800MHz spectral ranges tested, and test frequency range can be with
The change for pulse distance is gradually adjusted, and finally gives accurate sensitive frequency scope.
(2) sensitive frequency positioning flow is designed
By above to Gaussian monopulse, double gauss pulse, the spectrum analysis of Gauss even pulse, it can be found that single Gauss arteries and veins
The frequency spectrum of punching can completely cover 0~800MHz scopes, can detect whether test item is deposited within the range using the signal
In sensitive frequency distribution, and double gauss pulse and Gauss even pulse spectrum distribution are covered each by wanting the low frequency and high frequency of investigative range
Region, and also gradually changing with pulse distance T change distribution of pulses scope, it can be integrated and used using this rule
The scanning to spectral range to be detected is realized in two kinds of pulses, sensitive frequency frequency range that may be present is progressively reduced, finally with reference to quick
The location algorithm of sense frequency determines the distribution of sensitive frequency；
Test starts selection initial detecting pulse first and the electronic control module of driving pulse formation circuit produces pulse, by arteries and veins
Punching be injected into by probe in test item, monitor test item response simultaneously judge now test item whether there is sensitivity, according to ought
Preceding test mode and the sensitive test case of test item further select suitable pulse test test item, each eventually through analysis
Frequency spectrum difference between individual pulse determines the sensitive frequency distribution of test item.
(3) positioning flow is realized using LABVIEW
Data processing section is realized in LABVIEW programs in described conducted susceptibility waving map method, and signal leads to
Cross data acquisition equipment and be transferred to PC ends, sensitive response data is transferred in LABVIEW programs, gather sensitive information, and according to phase
The sensitive situations combination current test state and sensitive frequency positioning flow answered select next group of test pulse, and marker pulse shape
Corresponding test pulse, which is generated, into module continues next step test.
Described sensitive frequency positioning flow, 0~800MHz single Gaussian pulse is completely covered first by effective band
Tested, if sensitivity phenomenon occurs in test item, illustrate that test item has sensitive frequency in test scope, be otherwise not present
Sensitive frequency, that is, terminate test；If there is sensitive frequency, carry out second and test, i.e., strobe pulse spacing is the double of 0.5ns
Gaussian pulse tests test item, if there is sensitivity phenomenon, then illustrates that sensitive frequency is distributed in 0~500MHz scopes, otherwise divides
Cloth is in 500~800MHz scopes；If sensitivity phenomenon occurs in second of test, third time test strobe pulse spacing is 1.0ns
Double gauss pulse test test item, if there is sensitivity phenomenon, illustrate that sensitive frequency is distributed in 0~250MHz, be otherwise distributed
In 250~500MHz；As second of test does not occur sensitivity phenomenon, the Gauss that third time test strobe pulse spacing is 1.0ns
Even pulse tests test item, illustrates that sensitive frequency is distributed in 500~750MHz if there is sensitivity phenomenon, is otherwise distributed in 750
~800MHz；By that analogy, selecting many Gaussian pulses of suitable spacing and form, that sensitive frequency is gradually reduced is that may be present
Scope, finally gives accurate result.
A kind of cable conducted susceptibility Time-Domain Measuring System that this method is applied, including time domain impulse shaping module, note
Enter probe module, test item and signal monitoring and the part of data processing module four, wherein time domain impulse formation module is test arteries and veins
Rush signal generator, can according to data processing module impulse form and pitch requirements, it is many of 0.5ns to generate full bottom pulsewidth
Gaussian pulse, the module is connected with injection probe module, and the test signal of generation is transferred into injection probe module；Injection probe
Module ensures that the spectrum component maximum attenuation of the test signal in 0~800MHz test scopes is 10dB, is connected with test item, will
The injection test item of test signal completely, accurately excites the sensitivity phenomenon of test item；Test item when receiving test signal,
Sensitive response is produced to some spectrum components of signal, and response signal is passed into signal monitoring and data processing module；Letter
Number monitoring and data processing module to test item sensitivity response be monitored, extract and analyze the sensitivity characteristic of response signal, obtain
Memory response information after to the sensitive information of test item, and next group of test pulse is judged according to sensitive frequency location algorithm, together
When the module be connected with pulse shaping module, it would be desirable to the test pulse information transmission of generation give time domain impulse formation module, control
Time domain impulse formation module processed generates new test pulse and proceeds next group of test.
3rd, advantage：A kind of cable conducted susceptibility waving map method using many Gaussian pulses proposed by the present invention, it is excellent
Point is：
1. use many Gaussian pulses as test signal be not present leakage frequency situation, can well analog machine in reality
The complex electromagnetic environment faced in the work of border；
2. many Gaussian pulses are various informative, can comprehensively reflect interference signal form that may be present；
3. many Gaussian pulses belong to broadband time-domain signal, and test frequency spectrum is wide, and testing efficiency is high, can comprehensively examine relatively
The sensitive frequency distribution situation of test item；
4. automatic test is realized by LABVIEW, operated simpler；
5. testing efficiency is drastically increased, the testing time has been saved.
Brief description of the drawings
Fig. 1 Time-Domain Measuring System block diagrams.
Fig. 2 a-1, Fig. 2 a-2 are single Gaussian pulse waveforms and frequency spectrum.
Fig. 2 b-1, Fig. 2 b-2 are double gauss impulse waveform and frequency spectrum.
Fig. 2 c-1, Fig. 2 c-2 are Gauss even pulse waveform and frequency spectrum.
Fig. 3 flow chart of data processing figure.
Fig. 4 sensitive frequency positioning flow figures.
Fig. 5 sensitive frequency finder front panels.
Fig. 6 sensitive frequency finder block diagrams.
Fig. 7 a test item front panels.
Fig. 7 b test item flow charts.
Fig. 8 test item test results.
Embodiment
Below in conjunction with figure, the present invention is described in further detail.
A kind of cable conducted susceptibility Time-Domain Measuring System that the present invention is built, as shown in figure 1, including time domain impulse shaping
Module, injection probe module, test item and signal monitoring and the part of data processing module four, wherein time domain impulse form module
Test pulse signal generator, can according to data processing module impulse form and pitch requirements, generating full bottom pulsewidth is
0.5ns many Gaussian pulses, the module is connected with injection probe module, and the test signal of generation is transferred into injection probe mould
Block；Injection probe module ensures that the spectrum component maximum attenuation of the test signal in 0~800MHz test scopes is 10dB, with quilt
Test product is connected, and by the injection test item of test signal completely, accurately excites the sensitivity phenomenon of test item；Test item is being received
During test signal, sensitive response is produced to some spectrum components of signal, and response signal is passed into signal monitoring and data
Processing module；Signal monitoring and data processing module are monitored to test item sensitivity response, extract and analyze response signal
Sensitivity characteristic, obtains memory response information after the sensitive information of test item, and judge next group according to sensitive frequency location algorithm
Test pulse, while the module is connected with pulse shaping module, it would be desirable to which the test pulse information transmission of generation is to time domain impulse
Module is formed, control time domain impulse formation module generates new test pulse and proceeds next group of test.
A kind of cable conducted susceptibility waving map method using many Gaussian pulses, it is concretely comprised the following steps：
Step one：Fourier transformation is carried out to the frequency spectrum of many Gaussian pulses, the spectrum distribution of different many Gaussian pulses is obtained
Feature, the association mathematical modeling set up between the form of time domain Gaussian pulse signal and frequency domain covering frequency band, such as Fig. 2 a-1, Fig. 2 a-
2nd, Fig. 2 b-1, Fig. 2 b-2, Fig. 2 c-1, shown in Fig. 2 c-2.Gaussian monopulse time-domain expression is：
Wherein, A is amplitude, μ and σ2Expectation and standard variance for Gaussian function.Due to same distribution Gaussian pulse with
The signal energy distribution being distributed in Gaussian function is essentially identical, and both frequency distribution are also approximate, so using Gaussian function
Frequency spectrum carrys out the spectrum distribution of approximate Gaussian pulse, and Gaussian monopulse spectrum expression formula is：
By choosing suitable threshold value, the spectrum distribution of Gaussian monopulse approximately can be regarded as Gaussian Profile.
Only the requirement of location-sensitive frequency can not be reached using Gaussian monopulse, it is necessary to complete sensitive using many Gaussian pulses
Frequency is positioned.Using above-mentioned analysis result, with reference to the time shift characteristic of Fourier transformation, the frequency spectrum point of many Gaussian pulses can be obtained
Cloth situation.Assuming that the spacing of double gauss pulse is T, then amplitude spectrum expression formula is：
Spectrum component of the amplitude of double gauss pulse in -3dB can be effectively injected test item, its Validity Test frequency band
Boundary value ωbdRelational expression with pulse distance T is：The test signal that system is used is
Many Gaussian pulses that full bottom pulsewidth is 0.5ns, so the form parameter σ ≈ 1.4 × 10 of pulse-11.Due to σ ≈ 1.4 × 10-11Together
When have ω≤800MHz, so havingSo the Validity Test frequency band border of double gauss pulse and pulse distance
Relation can be reduced to：
cosωbdT=0
The Validity Test frequency band border ω of double gauss pulsebdIt is inversely proportional with pulse distance T, and there are multiple solutions, with double high
The change of this pulse distance, may have multiple Validity Test frequency bands in 0~800MHz.In design sensitive frequency location algorithm
When, first have to consideration is the Validity Test frequency band [0, ω of double gauss pulsebd0].At the same time also to consider between pulse
Away from change, Validity Test frequency band can increase [ωbd1,ωbd2] in it is some or all, comprehensive analysis double gauss pulse
The two frequency band scenarios, can accurately just navigate to sensitive frequency.
Using same analysis method, Gauss even pulse amplitude spectrum expression formula is：
It is identical with double gauss pulse computational methods, obtain the boundary value ω of Gauss even pulse Validity Test frequency bandbeWith pulse
Spacing T relational expression is：
cosωbeT=0
The pulse of pulse distance identical double gauss is identical with the Validity Test frequency band critical point of Gauss even pulse as can be seen here,
The covering that both combine can be completely requires the 0~800MHz spectral ranges tested, and test frequency range can be with pulse distance
Change gradually adjust, finally give accurate sensitive frequency scope.
Step 2：Sensitive frequency positioning flow is designed by the spectrum analysis to many Gaussian pulses.In many Gaussian pulses
Single Gaussian pulse spectrum can completely cover 0~800MHz scopes, can detect test item in the scope using the signal
Interior with the presence or absence of sensitive frequency distribution, double gauss pulse is identical with the Validity Test frequency band border of Gauss even pulse frequency spectrum, can be with
It is comprehensive to use two kinds of pulses and adjust detection of the interval completion of pulse to sensitive frequency scope.Flow chart of data processing figure such as Fig. 3
Shown, test starts selection initial detecting pulse first and the electronic control module of driving pulse formation circuit produces pulse, by pulse
It is injected into by probe in test item, monitors the response of test item and judge now whether test item sensitivity occurs, according to current
Test mode and the sensitive test case of test item further select suitable pulse test test item, eventually through analyze each
Frequency spectrum difference between pulse determines the sensitive frequency distribution of test item.
Different types of many Gaussian pulses can be chosen by (1) in sensitive frequency location algorithm, (2) adjustment pulse
Spacing realizes the scanning to test frequency range, orients the sensitive frequency of subject device., it is necessary to according to survey during actual test
The covering requirement of frequency band is tried, the suitable many Gaussian pulses of selection generation are tested test item.Therefore can be by many Gaussian pulses
Validity Test frequency band boundary value and pulse distance the corresponding relation generation table of comparisons as shown in table 1, the regulation of pulse distance step
Length elects 0.5ns as.The positioning flow of sensitive frequency is can be designed that by analysis of control table.
Table 1
According to the flow chart of data processing of conducted susceptibility Time-Domain Measuring System and to many Gaussian pulse Validity Test frequency bands
Analysis, can be designed that complete sensitive frequency positioning flow, sensitive frequency positioning flow figure is as shown in Figure 4.In test process
In 0~800MHz single Gaussian pulse completely covered first by effective band tested, if there is sensitivity phenomenon in test item,
Then illustrate that test item has sensitive frequency in test scope, otherwise in the absence of sensitive frequency, that is, terminate test.If existing sensitive
Frequency, then carry out testing for second, i.e., strobe pulse spacing is 0.5ns double gauss pulse test test item, if there is quick
Feel phenomenon, then illustrate that sensitive frequency is distributed in 0~500MHz scopes, be otherwise distributed in 500~800MHz scopes.If second is surveyed
Try out existing sensitivity phenomenon, then the double gauss pulse test test item that third time test strobe pulse spacing is 1.0ns, if there is
Sensitivity phenomenon, illustrates that sensitive frequency is distributed in 0~250MHz, is otherwise distributed in 250~500MHz.As second of test does not occur
Sensitivity phenomenon, third time test strobe pulse spacing tests test item for 1.0ns Gauss even pulse, if there is sensitivity phenomenon
Illustrate that sensitive frequency is distributed in 500~750MHz, be otherwise distributed in 750~800MHz.By that analogy, select suitable spacing and
Sensitive frequency scope that may be present is gradually reduced in many Gaussian pulses of form, finally gives accurate result.Sensitive frequency point
Cloth be possible to situation and corresponding testing process and sensitive situations are listed in table 2, wherein distribution frequency band represents sensitive frequency
The distribution of point, test signal order then represents the injection order and phase of sensitive frequency distribution many Gaussian pulses in this scope
(spacing units of the digitized representation pulse in bracket are ns to the test item sensitive situations answered, and it is quick that Y represents now test item appearance
Sense, N represents that now test item is without sensitivity).It can be seen that the location algorithm will need the 0~800MHz scopes measured to be distributed not phase
Deng 121 sub-bands, the width of each sub-band be sensitive frequency distribution within this range when measurement accuracy, measurement knot
Shu Shi, sensitive frequency location algorithm determines which sub-band sensitive frequency is distributed in.
Table 2
Step 3：Above-mentioned sensitive frequency positioning flow is write into LABVIEW programs, Automatic data processing and pulse is realized
Selection.The test item collected response is transferred to PC ends first, using LABVIEW called datas and sensitive features is carried out and carries
Take, judge whether test item occurs sensitivity, finally store test signal and sensitive response message.By combining current test pulse
With test item sensitive information, LABVIEW programs select next group of test pulse using above-mentioned sensitive frequency location algorithm.Sensitive frequency
As shown in Figure 5 and Figure 6, program is divided into sampling parameter control to the front panel and flow chart of point location program, data processing and refers to
Three parts of status display area are made, collection test item sensitivity response can be realized, sampled data is stored, current test shape is judged
State, selects next test pulse and the in real time function such as display sensitive frequency distribution.The LABVIEW programs provide tester with
The interface of test system interaction, can adjust systematic parameter according to the requirement of tester, and realize automatic test at PC ends, significantly
The testing time is shortened, test resource has been saved.
Embodiment 1
The feasibility of the design philosophy is verified using triangular wave as analog test signal below, LABVIEW is used in experiment
A VI is set up as test item, the front panel and flow chart of test item are as shown in Fig. 7 a and b.When test signal frequency spectrum is included
During 4MHz, test item output amplitude is 2 sine wave, and otherwise output amplitude is 1 sine wave, i.e. the sensitive frequency of test item is
4MHz。
Table 3
Test the triangular signal injection test item of the Usage data collection card collection a cycle used, the frequency of signal
As shown in table 3 with corresponding monocycle signal cut-off frequency, the change step of selection is 0.1MHz.Then test result such as Fig. 8 institutes
Show, be implanted sequentially the signal that frequency is 2MHz, 1MHz, 1.5MHz, 1.3MHz and 1.1MHz, obtained final testing result is quick
Frequency is felt in the range of 3.8~4.1MHz, is consistent with expected results.
Claims (3)
1. a kind of cable conducted susceptibility waving map method using many Gaussian pulses, is characterised by：Specifically include in following
Hold：
(1) many Gaussian pulse spectrums are analyzed
Using many Gaussian pulses as sensitive frequency waving map signal, first have to analyze the spectrum distribution rule of many Gaussian pulses
Rule, observes the spectrum distribution of many Gaussian pulses and the relation of pulse distance；
Gaussian monopulse time-domain expression is：X ∈ (μ-m, μ+m), wherein A are amplitude, μ and σ2For Gaussian function
Expectation and standard variance, the Gaussian pulse of same distribution and in Gaussian function be distributed signal energy distribution it is essentially identical, two
The frequency distribution of person is also approximate, so coming the spectrum distribution of approximate Gaussian pulse, Gaussian monopulse using the frequency spectrum of Gaussian function
Spectrum expression formula is：B is spectrum amplitude in formula, and the formula shows to choose suitable threshold value, Gauss simple venation
The spectrum distribution of punching approximately can be regarded as Gaussian Profile；
Using above-mentioned analysis result, with reference to the time shift characteristic of Fourier transformation, the spectrum distribution feelings of many Gaussian pulses can be obtained
Condition；Assuming that the spacing of double gauss pulse is T, then amplitude spectrum expression formula is：Double gauss pulse
Spectrum component in -3dB can be effectively injected test item, be Validity Test frequency band, Validity Test frequency band border ωbdWith arteries and veins
The relational expression for rushing spacing T is：The test signal that this method is used is that full bottom pulsewidth is
0.5ns many Gaussian pulses, the form parameter σ ≈ 1.4 × 10 of now pulse-11；Due to σ ≈ 1.4 × 10-11Simultaneously have ω≤
800MHz, so havingThe Validity Test frequency band border of double gauss pulse and the relation of pulse distance can simplify
For cos ωbdT=0；The Validity Test frequency band border ω of double gauss pulsebdThere are multiple solutions, sensitive frequency location algorithm is integrated
The Validity Test frequency band distribution of double gauss pulse is analyzed, first choosing suitable pulse distance makes the Validity Test frequency of double gauss pulse
Band is only [0, ωbd0], it can be realized to [0, ω by the spacing for changing double gauss pulsebd0] sector scanning, determine test item
It is distributed in the sensitive frequency of low frequency region；
Using same analysis method, Gauss even pulse amplitude spectrum expression formula is：With it is double
Gaussian pulse computational methods are identical, obtain the boundary value of Gauss even pulse Validity Test frequency band and pulse distance T relationship expression
Formula is：cosωbeT=0；The Validity Test frequency band of the pulse of pulse distance identical double gauss and Gauss even pulse faces as can be seen here
Boundary's point is identical, and the covering that both combine can completely requires the 0~800MHz spectral ranges tested, and test frequency range can be with
The change of pulse distance is gradually adjusted, and finally gives accurate sensitive frequency scope；
(2) sensitive frequency positioning flow is designed
By above to Gaussian monopulse, double gauss pulse, the spectrum analysis of Gauss even pulse, it can be found that single Gaussian pulse
Frequency spectrum can completely cover 0~800MHz scopes, and test item can be detected within the range with the presence or absence of quick using the signal
Feel frequency distribution, and double gauss pulse and Gauss even pulse spectrum distribution are covered each by wanting the low frequency and high frequency region of investigative range
Domain, and also gradually changing with pulse distance T change distribution of pulses scope, it can be integrated using this rule and use two
Scanning of the pulse realization to spectral range to be detected is planted, sensitive frequency frequency range that may be present is progressively reduced, it is final to combine sensitivity
The location algorithm of frequency determines the distribution of sensitive frequency；
Test starts selection initial detecting pulse first and the electronic control module of driving pulse formation circuit produces pulse, and pulse is led to
Cross probe to be injected into test item, monitor the response of test item and judge now whether test item sensitivity occurs, according to current survey
Examination state and the sensitive test case of test item further select suitable pulse test test item, eventually through each arteries and veins of analysis
Frequency spectrum difference between punching determines the sensitive frequency distribution of test item；
(3) positioning flow is realized using LABVIEW
Data processing section realizes that signal passes through number in LABVIEW programs in described conducted susceptibility waving map method
PC ends are transferred to according to collecting device, sensitive response data is transferred in LABVIEW programs, sensitive information is gathered, and according to corresponding
Sensitive situations combination current test state and sensitive frequency positioning flow select next group of test pulse, and marker pulse forms mould
Block generates corresponding test pulse and continues next step test.
2. a kind of cable conducted susceptibility waving map method using many Gaussian pulses according to claim 1, feature
It is：Described sensitive frequency positioning flow, single Gaussian pulse that 0~800MHz is completely covered first by effective band is carried out
Test, if sensitivity phenomenon occurs in test item, illustrates that test item has sensitive frequency in test scope, otherwise in the absence of sensitivity
Frequency, that is, terminate test；If there is sensitive frequency, carry out second and test, i.e., strobe pulse spacing is 0.5ns double gauss
Pulse test test item, if there is sensitivity phenomenon, then illustrates that sensitive frequency is distributed in 0~500MHz scopes, is otherwise distributed in
500~800MHz scopes；If sensitivity phenomenon occurs in second of test, third time test strobe pulse spacing is the double of 1.0ns
Gaussian pulse tests test item, if there is sensitivity phenomenon, illustrates that sensitive frequency is distributed in 0~250MHz, is otherwise distributed in 250
~500MHz；As second of test does not occur sensitivity phenomenon, the Gauss even pulse that third time test strobe pulse spacing is 1.0ns
Test item is tested, illustrates that sensitive frequency is distributed in 500~750MHz if there is sensitivity phenomenon, otherwise it is distributed in 750~
800MHz；By that analogy, select many Gaussian pulses of suitable spacing and form that sensitive frequency model that may be present is gradually reduced
Enclose, finally give accurate result.
3. the cable conducted susceptibility Time-Domain Measuring System that a kind of methods described of claim 1 or 2 is applied, including time domain impulse
Shaping module, injection probe module, test item and signal monitoring and the part of data processing module four, wherein time domain impulse form mould
Block is test pulse signal generator, can according to data processing module impulse form and pitch requirements, generate full bottom pulsewidth
For 0.5ns many Gaussian pulses, the module is connected with injection probe module, and the test signal of generation is transferred into injection probe mould
Block；Injection probe module ensures that the spectrum component maximum attenuation of the test signal in 0~800MHz test scopes is 10dB, with quilt
Test product is connected, and by the injection test item of test signal completely, accurately excites the sensitivity phenomenon of test item；Test item is being received
During test signal, sensitive response is produced to some spectrum components of signal, and response signal is passed into signal monitoring and data
Processing module；Signal monitoring and data processing module are monitored to test item sensitivity response, extract and analyze response signal
Sensitivity characteristic, obtains memory response information after the sensitive information of test item, and judge next group according to sensitive frequency location algorithm
Test pulse, while the module is connected with pulse shaping module, it would be desirable to which the test pulse information transmission of generation is to time domain impulse
Module is formed, control time domain impulse formation module generates new test pulse and proceeds next group of test.
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