CN108459209A - A kind of computer video electromagnetic leakage synchronization parameter extracting method and device - Google Patents
A kind of computer video electromagnetic leakage synchronization parameter extracting method and device Download PDFInfo
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Abstract
A kind of computer video electromagnetic leakage synchronization parameter extracting method of present invention offer and device, the method includes：The time-domain signal for obtaining computer video electromagnetic leakage emission carries out Fast Fourier Transform (FFT) twice to the time-domain signal, then carries out Local Extremum detection, obtain local extremum signal, and obtain local extremum signal maximum；Integral secondary lobe is carried out than processing to the local extremum signal maximum, obtains integral secondary lobe ratio；Judge whether the integral secondary lobe ratio is more than given threshold, if then judging that there are the red information of electromagnetic leakage, using the corresponding parameter of the local extremum signal maximum as the synchronization parameter of electromagnetic leakage signal, if otherwise judging that the red information of electromagnetic leakage is not present.The synchronization parameter for automatically extracting Computer and telephone intergration signal, under complex electromagnetic environment, the extraction of synchronization parameter has higher automaticity, rapidity and reliability.
Description
Technical field
The present invention relates to electromagnetic signal processing technology fields, same more particularly, to a kind of computer video electromagnetic leakage
Walk parameter extracting method and device.
Background technology
During the work time, the variation of electric current will generation electromagnetism hair in analog and digital signal processing for Information Technology Equipment
It penetrates, these Electromagnetic Launchings, which are such as received analysis, may restore relevant information, to cause information-leakage.It is this due to electromagnetism send out
Penetrate and caused by Information Security problem be electromagnetic leakage or electromagnetic information leakage, Electromagnetic Information Leakage, TMEPEST
Deng.In electromagnetic leakage research, " red information " refers to electric signal related with sensitive information, is otherwise ceased for poison-pen letter.Electromagnetic leakage
It is always existed with the operation of equipment, the moment threatens the information security of various kinds of equipment.With the continuous development of technology, electromagnetism is let out
Leakage increasingly bursts the security risk that Information Technology Equipment is brought.
It may pass through specific equipment and signal processing containing the sensitive information of information equipment processing in electromagnetic leakage signal
Means can realize the intercepting and capturing to electromagnetic leakage signal and restore sensitive information therein, threaten the information security of country.Meter
Calculation machine vision signal is since itself includes abundant useful information, and without encryption in serial transmission, driving current is big,
Exposed space is more, and compromising emanation signal is easy to be trapped and reappear.Therefore, electromagnetism is carried out to it before computer use to let out
Leak detection is particularly important.
In electromagnetic leakage emission signal detection process, the critical issue for implementing to detect automatically is carrying for synchronization parameter
It takes, synchronization parameter is hidden in electromagnetic leakage signal, and method in the prior art is generated by additional waveform occurrence of equipment
Synchronizing signal, and then synchronization parameter is extracted, but this method can just extract synchronous ginseng dependent on artificial continuous trial
Number, increases testing cost, and detection time is long.
Invention content
The present invention provides a kind of a kind of computer video for overcoming the above problem or solving the above problems at least partly
Electromagnetic leakage synchronization parameter extracting method and device solve and depend on artificial trial in the prior art, increase testing cost,
And the problem of detection time length.
According to an aspect of the present invention, a kind of computer video electromagnetic leakage synchronization parameter extracting method is provided, including：
The time-domain signal for obtaining computer video electromagnetic leakage emission carries out fast Fourier twice to the time-domain signal
FFT is converted, frequency signal is obtained, Local Extremum detection then is carried out to the frequency signal, obtains local extremum signal, and
Obtain local extremum signal maximum；
The integral secondary lobe ratio for calculating the local extremum signal obtains integral secondary lobe ratio；Judge the integral secondary lobe ratio
Whether value is more than given threshold, if then judging, there are the red information of electromagnetic leakage, the local extremum signal maximum to be corresponded to
Synchronization parameter of the parameter as electromagnetic leakage signal, if otherwise judging that the red information of electromagnetic leakage is not present.
Preferably, the time-domain signal for obtaining Computer and telephone intergration transmitting specifically includes：
The time-domain signal of computer video electromagnetic leakage emission is obtained by antenna.
It is specifically included preferably, carrying out Fast Fourier Transform (FFT) FFT twice to the time-domain signal：
First time FFT is carried out to the time-domain signal and obtains periodical spy then by window adding in frequency domain and filter preprocessing
The frequency-region signal of sign；
Second of FFT is carried out to the frequency-region signal, obtains the frequency signal of the frequency-region signal.
It is specifically included preferably, carrying out Local Extremum detection：
Windowing process is carried out based on Video Electronics Standards Association VESA priori line frequencies, it is right by the frequency signal localization
Frequency signal after localization carries out Local Extremum detection, obtains local extremum signal S (u), and obtain local extremum signal
Maximum value (um,S(um))。
Preferably, the integral secondary lobe ratio is：ISLR=20log10 [(Ptotal-Pmain)/Pmain], PtotalFor office
Whole energy values of portion extreme value signal S (u), PmainIt is 3dB main lobe energy values.
Preferably, judging that there are further include after the red information of electromagnetic leakage：
Windowing process is carried out to the frequency signal based on VESA priori field frequency, extracts field frequency.
A kind of computer video electromagnetic leakage synchronization parameter extraction element, including：
Information extraction modules, the time-domain signal for obtaining computer video electromagnetic leakage emission, to the time-domain signal
Fast Fourier Transform (FFT) FFT twice is carried out, frequency signal is obtained, Local Extremum detection then is carried out to the frequency signal,
Local extremum signal is obtained, and obtains local extremum signal maximum；
Electromagnetic leakage judgment module calculates it to the local extremum signal and integrates secondary lobe ratio, obtains integral secondary lobe ratio；
Judge whether the integral secondary lobe ratio is more than given threshold, if then judging that there are the red information of electromagnetic leakage, by the part
Synchronization parameter of the corresponding parameter of extreme value number maximum value as electromagnetic leakage signal, if otherwise judging that the red letter of electromagnetic leakage is not present
Breath.
Preferably, described information extraction module includes antenna and fourier transformation module；
The antenna is used to obtain the time-domain signal of computer video electromagnetic leakage emission；
The fourier transformation module is used to carry out first time Fast Fourier Transform (FFT) FFT to the time-domain signal, obtains
The frequency-region signal of periodic feature.
Preferably, the fourier transformation module is additionally operable to carry out second of FFT to the frequency domain data, institute is obtained
The frequency signal of frequency-region signal is stated, adding window is carried out to the frequency signal based on Video Electronics Standards Association VESA priori line frequency values
Processing, and detected by Local Extremum, local extremum signal S (u) is obtained, and obtain local extremum signal maximum (um,S
(um))。
Preferably, the electromagnetic leakage judgment module is additionally operable to after judging there are the red information of electromagnetic leakage, it is based on
VESA priori field frequency carries out windowing process to the frequency signal, extracts field frequency.
A kind of computer video electromagnetic leakage synchronization parameter extracting method of present invention proposition and device, pass through ripe number
Signal processing method, by carrying out multiple FFT processing to computer video electromagnetic leakage signal, after being handled according to priori
Its local extremum signal maximum is extracted in data localization, and by the red-black judgement for adjudicating realization electromagnetic leakage signal, automatically
The synchronization parameter for extracting Computer and telephone intergration signal, under complex electromagnetic environment, the extraction of synchronization parameter have it is higher from
Dynamic property, rapidity and reliability.
Description of the drawings
Fig. 1 is the computer video electromagnetic leakage synchronization parameter extraction method flow chart according to the embodiment of the present invention；
Fig. 2 is the original input signal oscillogram according to the embodiment of the present invention；
Fig. 3 is the first time FFT and pretreated oscillogram according to the embodiment of the present invention；
Fig. 4 is according to second of FFT of the embodiment of the present invention, based on VESA line frequency priori windowing processes and local pole
Oscillogram after value point detection；
Fig. 5 is after being detected based on VESA field frequency priori windowing processes and Local Extremum according to the embodiment of the present invention
Oscillogram.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
As shown in Figure 1, a kind of computer video electromagnetic leakage synchronization parameter extracting method is shown in figure, including：
The time-domain signal for obtaining computer video electromagnetic leakage emission carries out fast Fourier twice to the time-domain signal
FFT is converted, frequency signal is obtained, Local Extremum detection then is carried out to the frequency signal, obtains local extremum signal, and
Obtain local extremum signal maximum；The red information of electromagnetic leakage is judged whether by the maximum value of local extremum signal, and
Obtain synchronization parameter；
Specifically, calculating it to the local extremum signal integrates secondary lobe ratio, integral secondary lobe ratio is obtained, secondary lobe ratio is integrated
(Integrated Side Lobe Ratio, ISLR) is the ratio between side-lobe energy and main lobe energy；Judge the integral
Whether secondary lobe ratio is more than given threshold, if then judging there are the red information of electromagnetic leakage, by local extremum signal maximum
It is worth synchronization parameter of the corresponding parameter as electromagnetic leakage signal, if otherwise judging that the red information of electromagnetic leakage is not present.In this reality
It applies in example, the red information of possible electromagnetic leakage is obtained by the local signal maximum of localization signal after FFT twice first
Synchronization parameter value, then secondary lobe judgement more red-black than progress is integrated by calculating, judge that the electromagnetic leakage ceases for red information or poison-pen letter,
It is simple to extract flow realization, under complex electromagnetic environment, there is higher robustness, extraction that can automatically, quickly, stable is same
Parameter is walked, engineer application and practice are convenient for, solves complicated actually detected testing process in the process, detection time length, detection people
Work intervenes more problems.
Specifically, in the present embodiment, the time-domain signal for obtaining Computer and telephone intergration transmitting specifically includes：
The time-domain signal that computer video electromagnetic leakage emission is obtained by antenna, due to the presence of ambient noise, acquisition
Signal include noise and other electromagnetic interferences, as shown in Figure 2.
FFT (Fast Fourier Transformation, Fast Fourier Transform (FFT)) is a kind of discrete fourier transform
The highly effective algorithm of (Discrete Fourier Transform, DFT), it is odd, even, empty, real etc. according to discrete fourier transform
Characteristic is improved acquisition to the algorithm of Discrete Fourier Transform, can be divided into decimation in time algorithm and decimation in frequency is calculated
Method.
Using fft analysis signal frequency content when, analysis is limited data acquisition system.FFT thinks that waveform is one group
The set of finite data, a continuous waveform are made of several sections of small forms.For FFT, time domain and frequency domain are all
It is ring-shaped topological structure.On time, what former and later two endpoints of waveform were connected to.If the signal of measurement is periodic signal, adopt
Just there is the integer period in the collection time, then the above-mentioned hypothesis of FFT is reasonable.
The integer period can not be measured in many cases,.Therefore, the signal measured will be by among the period
Cut-out, different features are shown from the original signal of Time Continuous.Finite data sampling can make measuring signal generate violent change
Change.This violent variation is known as discontinuity.
When the collected period is non-integer, endpoint is discontinuous.These discontinuous segments are shown as high frequency in FFT
Ingredient.These radio-frequency components are not present in original signal.These frequencies may be far above nyquist frequency, in 0~sample rate
Half frequency separation in generate aliasing.The frequency obtained using FFT, the not instead of actual frequency of original signal, one changes
The frequency become.Similar to some frequency energy leakage to other frequencies.This phenomenon is called spectrum leakage.Frequency leakage makes
Good spectrum line is diffused into broader range of signal.
The error that FFT generations are carried out on the non-integer period can be reduced as far as possible by adding window.It is collected limited
The boundary of sequence will present discontinuity.Adding window can reduce the amplitude of these discontinuous sections.Adding window includes that will record the time to multiply
With the window of finite length, the amplitude of window tapers into, and is 0 in edge.Adding window the result is that show as far as possible one it is continuous
Waveform, reduce violent variation.
The oscillogram of window shows window sheet as a continuous frequency spectrum, and there are one main lobe, several secondary lobes.Main lobe is time domain
The center of signal frequency ingredient, secondary lobe is close to 0.The height of secondary lobe shows shadow of the windowed function for main lobe surrounding frequencies
It rings.May be more than to be responded to closer weak positive string signal main lobe to the side lobe response of strong sinusoidal signal.In general, low sidelobe
The leakage of FFT can be reduced, but increases the bandwidth of main lobe.Secondary lobe falls the progressive rate of decay that rate is side lobe peak.Increase
Add secondary lobe falls rate, can reduce spectrum leakage.
Specifically, in the present embodiment, carrying out Fast Fourier Transform (FFT) FFT to the time-domain signal and specifically including：
First time FFT is carried out to the time-domain signal, then carry out window adding in frequency domain and is filtered, periodic feature is obtained
Frequency-region signal；The electromagnetic leakage signal frequency spectrum of relative clean is obtained, as shown in Figure 3.
Second of FFT is carried out to the frequency-region signal, obtains the frequency signal of the frequency-region signal, and be based on video electronic
Standard Association (Video Electronics Standards Association, VESA) priori line frequency value carries out windowing process,
By second of FFT treated frequency signal localizations.
Specifically, in the present embodiment, carrying out Local Extremum detection to the signal after the localization and specifically including：
Local Extremum detection is carried out to the frequency signal after the localization, obtains local extremum signal S (u), and obtain
Take local extremum signal maximum (um,S(um)).Local extremum signal such as Fig. 4 institutes that priori based on VESA line frequencies obtains
Show.Maximum value (the u of search graph 4m,S(um)) preserve.
When carrying out integral secondary lobe ratio, ISLR=20log10 [(Ptotal-Pmain)/Pmain], PtotalIt is whole energy of S (u)
Magnitude, PmainIt is 3dB main lobe energy values.Implement red-black judgement, when less than given empirical value TrWhen, it is believed that in original signal not
There are leaked informations, when more than threshold value TrWhen, there are the red information of electromagnetic leakage, output synchronization parameter 1/u for judgementm。
In the present embodiment, Tr=8, ISLR>Tr, there are the red information of computer video electromagnetic leakage, 1/u in original signalm
For line frequency value.It is based further on the priori windowing process of VESA field frequencies, local extremum detection then is carried out to it, obtains office
Portion's extreme value data are as shown in figure 5, extraction field frequency value.
In the present embodiment, judge that there are further include after the red information of electromagnetic leakage：
Windowing process is carried out to the frequency signal based on VESA priori field frequency, extracts field frequency.
A kind of computer video electromagnetic leakage synchronization parameter extraction element is additionally provided in the present embodiment, including：
Information extraction modules, the time-domain signal for obtaining computer video electromagnetic leakage emission, to the time-domain signal
Fast Fourier Transform (FFT) FFT twice is carried out, frequency signal is obtained, Local Extremum detection then is carried out to the frequency signal,
Local extremum signal is obtained, and obtains local extremum signal maximum；
Electromagnetic leakage judgment module calculates it to the local extremum signal and integrates secondary lobe ratio, obtains integral secondary lobe ratio；
Judge whether the integral secondary lobe ratio is more than given threshold, if then judging that there are the red information of electromagnetic leakage, by the part
Synchronization parameter of the corresponding parameter of extreme value number maximum value as electromagnetic leakage signal, if otherwise judging that the red letter of electromagnetic leakage is not present
Breath.
In the present embodiment, described information extraction module includes antenna and fourier transformation module；
The antenna is used to obtain the time-domain signal of computer video electromagnetic leakage emission；
The fourier transformation module is used to carry out first time Fast Fourier Transform (FFT) FFT to the time-domain signal, obtains
The frequency-region signal of periodic feature.
In the present embodiment, the fourier transformation module is additionally operable to carry out second of FFT to the frequency domain data, obtains
The frequency signal of the frequency-region signal adds the frequency signal based on Video Electronics Standards Association VESA priori line frequency values
Window processing, and detected by Local Extremum, local extremum signal S (u) is obtained, and obtain local extremum signal maximum (um,
S(um))。
In the present embodiment, the electromagnetic leakage judgment module is additionally operable to after judging there are the red information of electromagnetic leakage, base
Windowing process is carried out to the frequency signal in VESA priori field frequency, extracts field frequency.
In conclusion a kind of computer video electromagnetic leakage synchronization parameter extracting method of present invention proposition and device, pass through
Ripe digital signal processing method, by carrying out multiple FFT processing to computer video electromagnetic leakage signal, by frequency-region signal
Localization, and the local extremum number maximum value of frequency-region signal is extracted, and the judgement of electromagnetic exposure signal is realized by red-black judgement,
The synchronization parameter for automatically extracting Computer and telephone intergration signal, under complex electromagnetic environment, the extraction of synchronization parameter is with higher
Automaticity, rapidity and reliability.
Finally, method of the invention is only preferable embodiment, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of computer video electromagnetic leakage synchronization parameter extracting method, which is characterized in that including：
The time-domain signal for obtaining computer video electromagnetic leakage emission carries out Fast Fourier Transform (FFT) twice to the time-domain signal
FFT obtains frequency signal, then carries out Local Extremum detection to the frequency signal, obtains local extremum signal, and obtain
Local extremum signal maximum；
The integral secondary lobe ratio for calculating the local extremum signal obtains integral secondary lobe ratio；Judging the integral secondary lobe ratio is
It is no to be more than given threshold, if then judging that there are the red information of electromagnetic leakage, by the corresponding ginseng of the local extremum signal maximum
Synchronization parameter of the number as electromagnetic leakage signal, if otherwise judging that the red information of electromagnetic leakage is not present.
2. according to the method described in claim 1, it is characterized in that, the time-domain signal for obtaining Computer and telephone intergration transmitting is specific
Including：
The time-domain signal of computer video electromagnetic leakage emission is obtained by antenna.
3. according to the method described in claim 2, it is characterized in that, carrying out Fast Fourier Transform (FFT) twice to the time-domain signal
FFT is specifically included：
First time FFT is carried out to the time-domain signal and obtains periodic feature then by window adding in frequency domain and filter preprocessing
Frequency-region signal；
Second of FFT is carried out to the frequency-region signal, obtains the frequency signal of the frequency-region signal.
4. according to the method described in claim 3, being specifically included it is characterized in that, carrying out Local Extremum detection：
Windowing process is carried out based on Video Electronics Standards Association VESA priori line frequencies, by the frequency signal localization, local area
Frequency signal after change carries out Local Extremum detection, obtains local extremum signal S (u), and it is maximum to obtain local extremum signal
It is worth (um,S(um))。
5. according to the method described in claim 4, it is characterized in that, the integral secondary lobe ratio is：ISLR=20log10
[(Ptotal-Pmain)/Pmain], PtotalIt is whole energy values of local extremum signal S (u), PmainIt is 3dB main lobe energy values.
6. according to the method described in claim 4, it is characterized in that, judging that there are further include after the red information of electromagnetic leakage：
Windowing process is carried out to the frequency signal based on VESA priori field frequency, extracts field frequency.
7. a kind of computer video electromagnetic leakage synchronization parameter extraction element, which is characterized in that including：
Information extraction modules, the time-domain signal for obtaining computer video electromagnetic leakage emission carry out the time-domain signal
Fast Fourier Transform (FFT) FFT twice obtains frequency signal, then carries out Local Extremum detection to the frequency signal, obtains
Local extremum signal, and obtain local extremum signal maximum；
Electromagnetic leakage judgment module calculates it to the local extremum signal and integrates secondary lobe ratio, obtains integral secondary lobe ratio；Judge
Whether the integral secondary lobe ratio is more than given threshold, if then judging that there are the red information of electromagnetic leakage, by the local extremum
Synchronization parameter of the corresponding parameter of number maximum value as electromagnetic leakage signal, if otherwise judging that the red information of electromagnetic leakage is not present.
8. device according to claim 7, which is characterized in that described information extraction module includes antenna and Fourier transformation
Module；
The antenna is used to obtain the time-domain signal of computer video electromagnetic leakage emission；
The fourier transformation module is used to carry out first time Fast Fourier Transform (FFT) FFT to the time-domain signal, obtains the period
The frequency-region signal of property feature.
9. device according to claim 8, which is characterized in that the fourier transformation module is additionally operable to the frequency domain number
According to second of FFT is carried out, the frequency signal of the frequency-region signal is obtained, is based on Video Electronics Standards Association VESA priori line frequency values
Windowing process is carried out to the frequency signal, and is detected by Local Extremum, local extremum signal S (u), and acquisition office are obtained
Portion extreme value signal maximum (um,S(um))。
10. device according to claim 9, which is characterized in that the electromagnetic leakage judgment module is additionally operable to judging to deposit
After the red information of electromagnetic leakage, windowing process is carried out to the frequency signal based on VESA priori field frequency, extracts field frequency.
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