CN110381005A - Detection method, device, equipment and the medium of power line communication leading character relevant peaks - Google Patents
Detection method, device, equipment and the medium of power line communication leading character relevant peaks Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
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Abstract
This application discloses detection method, device, equipment and the media of a kind of power line communication leading character relevant peaks, comprising: is based on G3-PLC standard, carries out signal sampling to target power line, obtains target power line in the destination sample point sequence at current time；Destination sample point sequence and default SYNCP sampling point sequence are subjected to computing cross-correlation, obtain target power line in the correlation at current time；Correlation of the target power line in different moments is obtained, sequence of correlation values is obtained, and is judged with the presence or absence of maximum absolute value in sequence of correlation values, and is more than the first correlation of preset threshold；If so, being judged in sequence of correlation values centered on the first correlation with the presence or absence of the multiple target correlations for meeting relevant peaks wave character；If so, relevant peaks corresponding to the first correlation are determined as effective relevant peaks.Obviously, the confidence level to power line communication leading character relevant peaks detection process thus can be improved, to enhance the reliability of electric power line locking.
Description
Technical field
The present invention relates to power line communication technology field, in particular to a kind of detection of power line communication leading character relevant peaks
Method, apparatus, equipment and medium.
Background technique
Leading character is the important component in electric-power wire communication signal frame structure, be for realizing receiving end frame synchronization,
The deterministic data block of detection and automatic growth control.For receiving end, it is first signal tune that reliable leading character, which synchronizes,
The basis of parameter extraction and signal demodulation processed, so, reliable leading character detection method is for being based on OFDM (Orthogonal
Frequency Division Multiplexing, orthogonal frequency division multiplexing) technology narrowband power line communication have it is extremely important
Meaning.
But in actual narrowband power line communication, inevitably encounter a plurality of types of noises and pulse
Interference, wherein the impulse disturbances of some types have very big instantaneous amplitude, and can continue the relatively long time.When these
When strong pulse interference is overlapped with leading character in time, the correlation peak that will lead to the synchronous operation in receiving end is generated by a relatively large margin
Decline, meanwhile, it also will appear some pseudo- peaks.In the prior art, detected to power line communication leading character relevant peaks
When, the case where usually detected to the current output relevant peaks of power line, thus will appear detection failure, that is,
It will appear the missing inspection, empty inspection and erroneous detection of relevant peaks, and thus cause the testing result of power line communication leading character relevant peaks credible
It spends poor.For this technical problem, currently, there are no more effective solution methods.
It can be seen that how to further increase to the confidence level in power line communication leading character relevant peaks detection process, it is
Those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of detection methods of power line communication leading character relevant peaks, dress
It sets, equipment and medium, to improve to the confidence level in power line communication leading character relevant peaks detection process.Its concrete scheme is such as
Under:
A kind of detection method of power line communication leading character relevant peaks, comprising:
Based on G3-PLC standard, signal sampling is carried out to target power line, to obtain the target power line when current
The destination sample point sequence at quarter；
The destination sample point sequence and default SYNCP sampling point sequence are subjected to computing cross-correlation, obtain the target
Correlation of the power line under current time；
Correlation of the target power line in M different moments is obtained, obtains sequence of correlation values, and judge the correlation
It whether there is the first correlation of maximum absolute value in value sequence；Wherein, M >=3；
If so, judging whether the absolute value of first correlation is greater than preset threshold；
Meet related spike if so, judging to whether there is in the sequence of correlation values centered on first correlation
Multiple target correlations of shape feature；
If so, relevant peaks corresponding to first correlation are determined as effective relevant peaks.
Preferably, the correlation for obtaining the target power line in M different moments, obtains the mistake of sequence of correlation values
Journey, comprising:
The target power line is obtained in M different moments, and there is the correlation of not constant duration, obtains the phase
Close value sequence.
Preferably, described that the destination sample point sequence and default SYNCP sampling point sequence are subjected to computing cross-correlation, it obtains
To after the process of the correlation at current time, further includes:
If correlation of the target power line in M different moments has not been obtained, execute again described based on G3-
PLC standard, the step of signal sampling is carried out to target power line, until get the target power line in M different moments
Correlation.
Preferably, described to be judged in the sequence of correlation values centered on first correlation with the presence or absence of meeting correlation
The process of multiple target correlations of peak wave character, comprising:
Judge that the sequence of correlation values whether there is and described the in any side centered on first correlation
The polarity of one correlation on the contrary, and absolute value be greater than the second correlation of targets threshold；Wherein, the targets threshold is according to institute
State value set by the first correlation；
If so, judge the sequence of correlation values any side centered on first correlation whether there is with
The identical third correlation of the polarity of first correlation；
If so, judge the sequence of correlation values any side centered on first correlation whether there is with
The polarity of first correlation on the contrary, and absolute value be less than the 4th correlation of the targets threshold；
If so, judge the sequence of correlation values any side centered on first correlation whether there is with
The polarity of first correlation is identical, and absolute value is less than the 5th correlation of the targets threshold；
If so, executing described the step of relevant peaks corresponding to first correlation are determined as effective relevant peaks.
Preferably, described to judge whether the sequence of correlation values deposits in any side centered on first correlation
In the polarity with first correlation on the contrary, and absolute value be greater than targets threshold the second correlation process after, also wrap
It includes:
If it is not, signal sampling is carried out to target power line, described in obtaining based on G3-PLC standard described in then re-executing
Target power line the destination sample point sequence at current time the step of, until the absolute value of first correlation be greater than it is described
Preset threshold.
Correspondingly, the invention also discloses a kind of detection devices of power line communication leading character relevant peaks, comprising:
Sampled point obtains module, for being based on G3-PLC standard, signal sampling is carried out to target power line, described in obtaining
Destination sample point sequence of the target power line at current time；
Correlation obtains module, mutual for carrying out the destination sample point sequence and default SYNCP sampling point sequence
Operation is closed, correlation of the target power line under current time is obtained；
First judgment module obtains correlation sequence for obtaining correlation of the target power line in M different moments
Column, and judge the first correlation that whether there is maximum absolute value in the sequence of correlation values；Wherein, M >=3；
Second judgment module, for when the judgement result of the first judgment module, which is, is, then judging first phase
Whether the absolute value of pass value is greater than preset threshold；
Third judgment module is for when the judgement result of second judgment module, which is, is, then related with described first
Judged in the sequence of correlation values centered on value with the presence or absence of the multiple target correlations for meeting relevant peaks wave character；
4th judgment module, for when the judgement result of the third judgment module be when, then will it is described first correlation
The corresponding relevant peaks of value are determined as effective relevant peaks.
Correspondingly, the invention also discloses a kind of detection devices of the synchronous relevant peaks of power line communication leading character, comprising:
Memory, for storing computer program；
Processor realizes a kind of power line communication leading character phase as previously disclosed when for executing the computer program
The step of detection method of Guan Feng.
Correspondingly, the invention also discloses a kind of computer readable storage medium, on the computer readable storage medium
It is stored with computer program, the computer program realizes power line communication leading character as previously disclosed when being executed by processor
The step of detection method of synchronous relevant peaks.
As it can be seen that being to carry out signal sampling to target power line based on G3-PLC standard first, to obtain in the present invention
Destination sample point sequence of the target power line at current time；Then, then by destination sample point sequence and default SYNCP sampled point
Sequence carries out computing cross-correlation, obtains correlation of the target power line under current time；And then it obtains target power line and exists
The correlation of M different moments obtains sequence of correlation values, and judges to whether there is the first of maximum absolute value in sequence of correlation values
Correlation；If there is the first correlation, then judge whether the absolute value of the first correlation is greater than preset threshold；If the first phase
The absolute value of pass value is greater than preset threshold, then being judged centered on the first correlation, which whether there is in sequence of correlation values, meets correlation
Multiple target correlations of peak wave character；If there is the target correlation for meeting relevant peaks wave character in sequence of correlation values
Value, then be determined as effective relevant peaks for relevant peaks corresponding to the first correlation.Obviously, through the invention in method because
It is that possessed relevant peaks wave character detects effective relevant peaks between multiple moment correlations using target power line,
Compared to be in the prior art only for target power line current time output relevant peaks detect, so that it may it is opposite to subtract
The influence degree of few suffered outside noise and impulse disturbances in relevant peaks detection process, thus can greatly improve
To the confidence level in target power line communication leading character relevant peaks detection process.Correspondingly, a kind of electric power provided by the present invention
Line communicates detection device, equipment and the medium of leading character relevant peaks, equally has above-mentioned beneficial effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of process of the detection method of power line communication leading character relevant peaks provided by the embodiment of the present invention
Figure；
Fig. 2 is the structure chart of physical-layer data frame in power line communication standard；
Fig. 3 is that leading character and basic synchronization cell S YNCP cross-correlation output waveform are shown under noiseless and disturbed condition
It is intended to；
Fig. 4 is that target power line communication receiver leading character cross-correlation output waveform is shown under very noisy and impulse disturbances
It is intended to；
Fig. 5 is the process of the detection method of another kind power line communication leading character relevant peaks provided by the embodiment of the present invention
Figure；
Fig. 6 (a) is the waveform at positive correlation peak of the basic synchronization unit near relevant peaks under noiseless and disturbed condition
Schematic diagram；
Fig. 6 (b) is that the waveform at negatively correlated peak of the basic synchronization unit near peak value shows under noiseless and disturbed condition
It is intended to；
Fig. 7 be under very noisy and impulse disturbances three based on the correct relevant peaks of waveform characteristic matching possessed by relevant peaks
Detection schematic diagram；
Fig. 8 be under very noisy and impulse disturbances three based on waveform characteristic matching spurious correlation peak possessed by relevant peaks
Detection schematic diagram；
Fig. 9 is a kind of structure of the detection device of power line communication leading character relevant peaks provided by the embodiment of the present invention
Figure；
Figure 10 is a kind of structure of the detection device of power line communication leading character relevant peaks provided by the embodiment of the present invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of detection side of power line communication leading character relevant peaks provided by the embodiment of the present invention
The flow chart of method, the detection method include:
Step S11: being based on G3-PLC standard, carries out signal sampling to target power line, is being worked as with obtaining target power line
The destination sample point sequence at preceding moment；
Step S12: destination sample point sequence and default SYNCP sampling point sequence are subjected to computing cross-correlation, obtain target
Correlation of the power line under current time；
Step S13: correlation of the target power line in M different moments is obtained, obtains sequence of correlation values, and judge correlation
It whether there is the first correlation of maximum absolute value in value sequence；If so, thening follow the steps S14；
Wherein, M >=3；
Step S14: judge whether the absolute value of the first correlation is greater than preset threshold；If so, thening follow the steps S15；
Step S15: being judged centered on the first correlation, which whether there is in sequence of correlation values, meets relevant peaks wave character
Multiple target correlations；If so, thening follow the steps S16；
Step S16: relevant peaks corresponding to the first correlation are determined as effective relevant peaks.
It should be noted that narrow-band power line carrier communication G3-PLC standard uses ofdm communication technology, figure is referred to
2, Fig. 2 be the structure chart of physical-layer data frame in power line communication standard, as shown in Fig. 2, physical layer frame includes 3 most of: preceding
Lead symbol (Preamble), frame control head (FCH, Frame Control Header) and user data.Wherein, leading character is for real
Existing receiving end frame synchronization, detection and automatic growth control；It include the specific information of currently transmitted data frame, packet in frame control head
Include the important informations such as frame type, modulating mode, carrier wave mapping mode, frame length.As shown in Fig. 2, each leading character is by 8 phases
With basic synchronization unit P symbol (SYNCP) and 1.5 basic synchronization unit M symbols (SYNCM) formed, each SYNCP with
SYNCM includes the sampled point of 256 fixed quantities, is pre-stored in transmitter and receiver, and the AGC for completing receiving end is controlled
System, frame synchronization, channel estimation and initial reference phase estimation.The length of SYNCM and SYNCP is identical, and difference is only all adopts
Sampling point has the phase shift of 180 degree compared with SYNCP, and alternatively the electrical level polar of sampled point is opposite with SYNCP.
SYNCP and SYNCM is the zero-mean perseverance envelope sequence with good autocorrelation performance.It is same that frame is carried out in receiving end
When step, by default SYNCP sampling point sequence and sampling point sequence progress computing cross-correlation is received, when default SYNCP sampled point sequence
When column are aligned with the SYNCP received in sampling point sequence, a sharp positive correlation peak can be generated.Refer to Fig. 3, Fig. 3 be
The schematic diagram of leading character and basic synchronization cell S YNCP cross-correlation output waveform under noiseless and disturbed condition.From the figure 3, it may be seen that
When being consecutively detected 8 positive correlation peaks and 1 negatively correlated peak, receiving end synchronous circuit can determine the end of leading character
Position, to realize frame synchronization.
But in practical narrowband power line communication, inevitably face a plurality of types of noise jammings and arteries and veins
Punching interference, wherein the impulse disturbances of some types also have very big instantaneous amplitude, and continue the relatively long time, when this
When a little strong pulse interferences are overlapped with leading character in time, the correlation peak that will lead to the synchronous operation in receiving end is generated significantly
Decline, meanwhile, also will appear some pseudo- peaks, specifically refer to Fig. 4.Fig. 4 is the target power under very noisy and impulse disturbances
The schematic diagram of line communication receiver leading character cross-correlation output waveform；Digital number in Fig. 4 gives the institute of correct relevant peaks
In position, wherein 1.~it is 8. to be positively correlated peak, it is 9. negatively correlated peak.Comparison diagram 3 it is found that have noise and interference in the case where,
Receiving peak value has a degree of deformation, wherein and the peak value of the 4th relevant peaks is greatly lowered, meanwhile, the 4th and the 5th
Occur two pseudo- peaks between a peak value.At this point, if currently associated peak is detected, it may appear that the leakage of relevant peaks
Inspection and empty inspection then will appear frame synchronization failure, can not determine frame control head in sampled data stream once there is the missing inspection of relevant peaks
Position, just can not carry out subsequent processing in this way, on the other hand, when examining if there is relevant peaks empty, will lead to peak value inspection
Mistake occurs for quantitation and position, may cause sync bit detection mistake or synchronizing process failure.
It follows that causing the insecure main cause of relevant peaks testing result to be because using in the prior art
Currently associated peak determining method is detected to judge the existence of SYNCP or SYNCM.Under very noisy and interference environment, relevant peaks inspection
Surveying result will receive the influence of noise, and the reliability of relevant peaks testing result and confidence level is thus caused to reduce.
And in the present embodiment, in order to improve to credible in target power line communication leading character relevant peaks detection process
Degree is to be detected using wave character possessed by relevant peaks to target power line communication leading character relevant peaks, and with this
To resist to the influence of noise and impulse disturbances in relevant peaks detection process.
Specifically, being to carry out signal sampling based on G3-PLC standard to target power line, obtain first in the present embodiment
To destination sample point sequence of the target power line under current time；And then destination sample point sequence and default SYNCP are adopted
Sampling point sequence carries out computing cross-correlation, obtains correlation of the target power line under current time.
According to the system performance of bandwidth carrier it is found that each basic synchronization element length is 256 sampled points in leading character,
It therefore, in the present embodiment, is that signal sampling is carried out to target power line using sampled point buffer, that is, slow in sampled point
Rush 256 sampled points of caching in device.After sampled point buffer samples obtain 256 sampled points, obtains target power line and exist
The destination sample point sequence at current time, and then destination sample point sequence and default SYNCP sampled point are subjected to cross-correlation fortune
It calculates, obtains correlation of the target power line under current time.
Assuming that destination sample point sequence of the target power line under current time is Sn-k, k=0~255, wherein n is indicated
Current time；Assuming that default SYNCP sampling point sequence is Lk, k=0~255, then, phase of the target power line in current time n
Pass value RnCalculation method it is as follows:
When getting target power line in the correlation R of current time nnLater, then target power line is obtained in M difference
The correlation at moment obtains sequence of correlation values, and judges the first correlation that whether there is maximum absolute value in sequence of correlation values；
If judging whether the absolute value of the first correlation is greater than there are when the first correlation of maximum absolute value in sequence of correlation values
Preset threshold.Obviously, the purpose of this step is to search to obtain maximum correlation peak.
If the absolute value of the first correlation is greater than preset threshold, sequence of correlation values is judged centered on the first correlation
In with the presence or absence of meeting multiple target correlations of relevant peaks wave character；If existing in sequence of correlation values and meeting related spike
Multiple target correlations of shape feature, so that it may which relevant peaks corresponding to the first correlation are determined as to be one effectively related
Peak.Obviously, in the detection method provided by the present embodiment, correlation sequence is judged by wave character possessed by relevant peaks
Whether relevant peaks corresponding to the first correlation in column are effective relevant peaks, so that it may increase substantially relevant peaks testing result
Robustness and reliability.
Also, the method that only target power line is detected in current time output relevant peaks in compared with the prior art
For, in the present embodiment, it is thus only necessary to which correlation of more caching of target power lines under different moments does not need increase volume
Outer calculation amount, does not also accordingly increase on implementation complexity, so, detection method provided by the present embodiment can also
Suitable for the actual scene that hardware resource is limited.
As it can be seen that being signal sampling to be carried out to target power line, based on G3-PLC standard to obtain first in the present embodiment
Take target power line in the destination sample point sequence at current time；Then, then by destination sample point sequence and default SYNCP sample
Point sequence carries out computing cross-correlation, obtains correlation of the target power line under current time；And then obtain target power line
In the correlation of M different moments, sequence of correlation values is obtained, and is judged in sequence of correlation values with the presence or absence of the of maximum absolute value
One correlation；If there is the first correlation, then judge whether the absolute value of the first correlation is greater than preset threshold；If first
The absolute value of correlation is greater than preset threshold, then being judged centered on the first correlation, which whether there is in sequence of correlation values, meets phase
Close the target correlation of peak wave character；If there is the multiple targets correlation for meeting relevant peaks wave character in sequence of correlation values
Value, then be determined as effective relevant peaks for relevant peaks corresponding to the first correlation.Obviously, through this embodiment in method, because
To be that possessed relevant peaks wave character detects effective relevant peaks between multiple moment correlations using target power line
, compared to in the prior art be only to target power line current time output relevant peaks detect for, so that it may phase
To the influence degree for reducing suffered outside noise and impulse disturbances in relevant peaks detection process, thus can mention significantly
Height is to the confidence level in target power line communication leading character relevant peaks detection process.
Based on the above embodiment, the present embodiment makees further optimization and explanation to technical solution, specifically, above-mentioned step
It is rapid: to obtain correlation of the target power line in M different moments, obtain the process of sequence of correlation values, comprising:
Target power line is obtained in M different moments, and there is the correlation of not constant duration, obtains correlation sequence
Column.
It is understood that can be and chosen in a manner of equal time distances during choosing sequence of correlation values
Sequence of correlation values is also possible to choose sequence of correlation values in a manner of not constant duration, specifically, in the present embodiment, being
Sequence of correlation values is chosen in a manner of not constant duration, because in practical application, due to the spy of leading character structure feature
Different property, so, the situation of change that sequence of correlation values is showed is usually asymmetric.Therefore, when with not constant duration
Mode when choosing sequence of correlation values, it will be able to so that the sequence of correlation values chosen is more representative of target power line communications reception
Hold the actual conditions of leading character cross-correlation output waveform.
As it can be seen that technical solution provided by through this embodiment, can be further improved sequence of correlation values in selection process
In global reliability.
Based on the above embodiment, the present embodiment is further described and optimizes to technical solution, as one preferred
Above-mentioned steps S12: destination sample point sequence and default SYNCP sampling point sequence are carried out computing cross-correlation, obtained by embodiment
After the process of the correlation at current time, further includes:
If target power line has not been obtained in the correlation of M different moments, the G3-PLC standard that is based on is executed again, it is right
Target power line carries out the step of signal sampling, until getting target power line in the correlation of M different moments.
It is understood that in practical application, if not getting target power line in the phase of M different moments
Pass value, in the case, can not just be formed one may determine that relevant peaks whether be effective relevant peaks sequence of correlation values, and
And if with less than sequence of correlation values composed by M correlation come when being detected to relevant peaks, due to the number of correlation
Measure less, the case where still will appear missing inspection, empty inspection and erroneous detection.It in order to avoid this situation, at this point, can be again
Back to step S11: the step of being based on G3-PLC standard, signal sampling carried out to target power line, until acquiring target
Correlation of the power line in M different moments, then the communication leading character relevant peaks of target power line are detected, at this point, just
It opposite can improve in the confidence level that relevant peaks are carried out with testing result in detection process.
As it can be seen that technical solution provided by through this embodiment, can make the communication leading character phase to target power line
The testing result of Guan Feng is more accurate, reliable.
Based on the above embodiment, the present embodiment is further described and optimizes to technical solution, refers to Fig. 5, and Fig. 5 is
The flow chart of the detection method of another kind power line communication leading character relevant peaks provided by the embodiment of the present invention；On specifically,
State step S15: being judged centered on the first correlation, which whether there is in sequence of correlation values, meets the multiple of relevant peaks wave character
The process of target correlation, comprising:
Step S151: judge that sequence of correlation values whether there is and the first phase in any side centered on the first correlation
The polarity of pass value on the contrary, and absolute value be greater than the second correlation of targets threshold；If so, thening follow the steps S152；
Wherein, targets threshold is the value according to set by the first correlation；
Step S152: judge that sequence of correlation values whether there is and the first phase in any side centered on the first correlation
The identical third correlation of the polarity of pass value；If so, thening follow the steps S153；
Step S153: judge that sequence of correlation values whether there is and the first phase in any side centered on the first correlation
The polarity of pass value on the contrary, and absolute value be less than the 4th correlation of targets threshold；If so, thening follow the steps S154；
Step S154: judge that sequence of correlation values whether there is and the first phase in any side centered on the first correlation
The polarity of pass value is identical, and absolute value is less than the 5th correlation of targets threshold；If so, thening follow the steps S16；
Step S16: the step of relevant peaks corresponding to the first correlation are determined as effective relevant peaks by execution.
In the present embodiment, there is provided a kind of, and that target power line is detected using wave character possessed by relevant peaks is logical
Believe the specific detection method of leading character relevant peaks.Fig. 6 is referred to, Fig. 6 (a) is the basic synchronization list under noiseless and disturbed condition
The waveform diagram at positive correlation peak of the member near relevant peaks；Fig. 6 (b) is the basic synchronization unit under noiseless and disturbed condition
The waveform diagram at the negatively correlated peak near peak value.Assuming that the correlation by target power line in M different moments is formed
Sequence of correlation values are as follows:
RD,n={ Rn-20,Rn-18,Rn-16,Rn-13,Rn-10,Rn-7,Rn-4,Rn-2,Rn}；
The correlation of zero-mean perseverance envelope sequence as used by basic synchronization unit has specific mode, for just
For relevant peaks, also there is symmetrical opposite polarity peak value and time big correlation at left and right sides of maximum correlation peak, also, can be
The left and right sides forms two apparent grooves；It is for negatively correlated peak, then just opposite.Meanwhile in maximum correlation peak two sides
Two opposite polarity peak values value be more than maximum correlation peaks half, under noise and disturbed condition, value also can
More than the one third of maximum correlation peaks, and this feature can also be used as one of feature of waveform pattern, and other positions
Correlation is poor to noise and the resistivity of interference since value is relatively small, and value size is just no longer desirable for waveform correlation
Pattern match.The above-mentioned characteristic showed near maximum correlation peak according to relevant peaks output waveform, so that it may detect phase
Whether Guan Feng is genuine effective relevant peaks, and thus improves the accuracy of testing result.
So during being detected to relevant peaks, when judgement obtains the first correlation Rn-10It is sequence of correlation values
RD,nThe correlation of middle maximum absolute value, also, the first correlation Rn-10Absolute value be greater than preset threshold after, illustrate first
Correlation Rn-10It is exactly sequence of correlation values RD,nIn peak-peak.At this point, in order to further enhance the standard of relevant peaks testing result
True property and reliability, can also continue to judge sequence of correlation values with the first correlation Rn-10Centered on any side whether
In the presence of with the first correlation Rn-10Polarity on the contrary, and absolute value be greater than targets threshold the second correlation；Specifically, in this reality
It applies in example, is the one third that targets threshold is set as to the first correlation, it should be noted that the value of targets threshold can be with
The different adjustment for carrying out adaptability according to the actual situation, do not repeat specifically herein.Obviously, Rn-13And Rn-7All meet such
Situation, that is, in the first correlation Rn-10Centered on any side exist and the first correlation Rn-10Polarity on the contrary, and absolutely
It is greater than the second correlation of targets threshold to value.
And then judge sequence of correlation values RD,nWith the first correlation Rn-10Centered on any side whether there is with
First correlation Rn-10The identical third correlation of polarity；Obviously, Rn-16And Rn-4All meet such situation, that is, first
Correlation Rn-10Centered on any side exist and the first correlation Rn-10The identical third correlation of polarity, need to illustrate
, since the value of the second local peaking is lower, its value can be arrived by noise and impulse disturbances, so, in the present embodiment
In, only with Rn-16And Rn-4Polarity judged.
When judgement is obtained in the first correlation Rn-10Centered on any side exist and the first correlation Rn-10Polarity phase
With third correlation and then judge sequence of correlation values RD,nWith the first correlation Rn-10Centered on any side whether
In the presence of with the first correlation Rn-10Polarity on the contrary, and absolute value be less than targets threshold the 4th correlation, it is clear that Rn-18And Rn-2
All meet such situation, that is, in the first correlation Rn-10Centered on any side exist and the first correlation Rn-10Polarity
On the contrary, and absolute value be less than targets threshold the 4th correlation.
When judgement is obtained in the first correlation Rn-10Centered on any side exist and the first correlation Rn-10Polarity phase
Instead, and absolute value is less than the 4th correlation of targets threshold and then judges with the first correlation Rn-10Centered on it is any
Side whether there is and the first correlation Rn-10Polarity it is identical, and absolute value be less than targets threshold the 5th correlation, it is clear that
Rn-20And RnAll meet such situation, that is, with the first correlation Rn-10Centered on any side exist and the first correlation
Rn-10Polarity it is identical, also, absolute value be less than targets threshold the 5th correlation.
In conclusion the first correlation Rn-10Corresponding to sequence of correlation values RD,nThe position of middle maximum correlation peak, Rn-13And Rn-7
Correspond respectively to the first correlation Rn-10The opposite polarity relevant peaks in two sides (are first concave point for being positively correlated peak, to negative
It is the first salient point for Guan Feng), Rn-16And Rn-4Correspond respectively to the second local peaking of maximum correlation peak two sides same polarity, Rn-18
And Rn-2Respectively corresponding the opposite polarity relevant peaks in maximum correlation peak two sides (is the second concave point for being positively correlated peak, to negative correlation
It is the second salient point for peak), Rn-20And RnCorrespond respectively to the third local peaking of maximum correlation peak two sides same polarity, it is clear that should
Sequence of correlation values has wave character possessed by relevant peaks, in the case, so that it may by the first correlation Rn-10It is corresponding
Relevant peaks be determined as an effective relevant peaks.
It should be noted that in practical application, if step S151, step S152, step S153 and step S154
Judging result when being no, all illustrate that empty inspection has occurred in the detection process of maximum correlation peak, in this case it is desirable to return again
It returns to step S11 to carry out resampling to target power line, communicates leading character to enter target power line at next moment
The detection process of relevant peaks.
In addition, being to be specifically described by taking nine correlations in sequence of correlation values as an example, in reality in the present embodiment
Border application in, can also difference according to the actual situation come in sequence of correlation values correlation number carry out adaptability tune
It is whole, it is no longer specifically repeated herein.
As it can be seen that technical solution provided by through this embodiment, further ensures the accuracy of relevant peaks testing result
With reliability.
As a preferred embodiment, step S151: judging sequence of correlation values centered on the first correlation
Any side whether there is the polarity with the first correlation on the contrary, and absolute value be greater than the process of the second correlation of targets threshold
Later, further includes:
If it is not, then re-executing based on G3-PLC standard, signal sampling is carried out to target power line, to obtain target power
Line is the destination sample point sequence at current time the step of, until the absolute value of the first correlation is greater than preset threshold.
It is understood that if it is judged that any side of the sequence of correlation values centered on the first correlation be not present with
The polarity of first correlation on the contrary, and absolute value when being greater than the second correlation and third correlation of targets threshold, then before illustrating
Empty inspection has occurred in the detection process of peak-peak detected by face, in the case, so that it may re-execute the steps S11, with into
The peak-peak of row subsequent time detects.
As it can be seen that technical solution provided by through this embodiment, can further be lifted at and detected to relevant peaks
Overall execution efficiency in journey.
Disclosure of that based on the above embodiment, the present embodiment are illustrated by a specific example.Refer to figure
7, Fig. 7 be three detections based on the correct relevant peaks of waveform characteristic matching possessed by relevant peaks under very noisy and impulse disturbances
Schematic diagram.In Fig. 7, sequence of correlation values be may be expressed as:
RD,n={ Rn-20,Rn-18,Rn-16,Rn-13,Rn-10,Rn-7,Rn-4,Rn-2,Rn}
In Fig. 7 (a):
RD,nFor 0.2124, -0.1117,0.1575, -0.6481,0.8993, -0.6637,0.2351, -0.2387,
0.3341 }, the detection process of relevant peaks is as follows:
1) due to Rn-10=0.8993 is RD,nMiddle numerical value is maximum, and is greater than the correlation of targets threshold, also, Rn-10=
0.8993 is positive value, meets the peak-peak testing conditions of step S14, so, Rn-10Corresponding relevant peaks may be one
It is positively correlated peak；
2) due to Rn-13=-0.6481 and Rn-7=-0.6637 absolute value is more than Rn-10=0.8993 one third,
Also, Rn-13And Rn-7It is negative value, so, Rn-13And Rn-7Meet the criterion of step S151；
3) due to Rn-16And Rn-4It is positive value, also, and Rn-10=0.8993 polarity is identical, so, Rn-16And Rn-4It is full
The criterion of sufficient step S152；
4) due to Rn-18=-0.1117 and Rn-2=-0.2387 is negative value, also, Rn-18And Rn-2Absolute value be respectively less than
Rn-10=0.8993 one third, so, Rn-18And Rn-2Meet the criterion of step S153；
5) due to Rn-20=0.2124 and Rn=0.3341 is positive value, also, Rn-20Absolute value be less than Rn-10=
0.8993 one third, so, Rn-20Meet the criterion of step S154；
Obviously, sequence of correlation values RD,nDecision condition be all satisfied, therefore, the relevant peaks in 7 (a) be one it is effective just
Relevant peaks.
In Fig. 7 (b):
RD,nFor 0.085, -0.096,0.3725, -0.8510,0.9208, -0.398, -0.1435,0.1257, -
0.0073 }, the detection process of relevant peaks is as follows:
1) due to Rn-10=0.9208 is RD,nMiddle number is maximum, and is greater than the correlation of targets threshold, also, Rn-10=
0.9208 is positive value, meets the peak-peak testing conditions of step S14, so, Rn-10Corresponding relevant peaks may be one
It is positively correlated peak；
2) due to Rn-13=-0.8510 and Rn-7=-0.398 absolute value is more than Rn-10=0.9208 one third,
Also, Rn-13And Rn-7It is negative value, so, Rn-13And Rn-7Meet the criterion of step S151；
3) due to Rn-16=0.3725 is positive value, with Rn-10=0.8993 polarity is identical, so, Rn-16=0.3725 is full
The criterion of sufficient step S152；
4) due to Rn-18=-0.096 is negative value, also, Rn-18Absolute value be respectively less than Rn-10The three of=0.9208/
One, so, Rn-18=-0.096 meets the criterion of step S153；
5) due to Rn-20=0.085 is positive value, also, Rn-20Absolute value be less than Rn-10=0.9208 one third, institute
With Rn-20=0.085 meets the criterion of step S154；
Obviously, sequence of correlation values RD,nDecision condition be all satisfied, therefore, the relevant peaks in Fig. 7 (b) are one effective
It is positively correlated peak.
In Fig. 7 (c):
RD,nFor -0.0883,0.006, -0.1932,0.5744, -0.7372,0.5444, -0.2108,0.2556, -
0.3209 }, the detection process of relevant peaks is as follows:
1) due to Rn-10=-0.7372 is RD,nMiddle number is maximum, and its absolute value is greater than the correlation of targets threshold, full
The peak-peak testing conditions of sufficient step S14, so, Rn-10Corresponding relevant peaks may be a negatively correlated peak；
2) due to Rn-13=0.5744 and Rn-7=0.5444 more than Rn-10The one third of=- 0.7372 absolute value, and
And Rn-13And Rn-7It is positive value, so, Rn-13And Rn-7Meet the criterion of step S151；
3) due to Rn-16=-0.1932 and Rn-4=-0.2108 is negative value, with Rn-10=-0.7372 polarity is identical, institute
With Rn-16And Rn-4Meet the criterion of step S152；
4) due to Rn-18=0.006 and Rn-2=0.2556 is positive value, also, Rn-18And Rn-2Absolute value be respectively less than
Rn-10The one third of=- 0.7372 absolute value, so, Rn-18And Rn-2Meet the criterion of step S153；
5) due to Rn-20=-0.0883 and Rn=-0.3209 is negative value, also, Rn-20Absolute value be less than Rn-10=-
The one third of 0.7372 absolute value meets the criterion of step S154；
Obviously, sequence of correlation values RD,nDecision condition be all satisfied, therefore, the relevant peaks of Fig. 7 (c) are one effective negative
Relevant peaks.
Refer to Fig. 8, Fig. 8 be under very noisy and impulse disturbances three based on waveform characteristic matching possessed by relevant peaks
The detection schematic diagram at spurious correlation peak.In fig. 8, sequence of correlation values may be expressed as:
RD,n={ Rn-20,Rn-18,Rn-16,Rn-13,Rn-10,Rn-7,Rn-4,Rn-2,Rn}；
In Fig. 8 (a):
RD,nFor -0.0855,0.503,0.0936, -0.5479,0.5506, -0.1103, -0.3342,0.0979,
0.3954 }, the detection process of relevant peaks is as follows:
1) due to Rn-10=0.5506 is RD,nMiddle number is maximum, and its absolute value is greater than the correlation of targets threshold, meets
The peak-peak testing conditions of step S14, so, Rn-10Corresponding relevant peaks may be a positive correlation peak；
2) due to Rn-13=-0.5479 and Rn-7=-0.1103 is negative value, also, Rn-13Absolute value be more than Rn-10=
The one third of 0.5506 absolute value, so, Rn-13Meet the criterion of step S151；
3) due to Rn-4=-0.3342 is negative value, with Rn-10=-0.7372 polarity is identical, so, Rn-4Meet step
The criterion of S152；
4) due to Rn-18=0.006 and Rn-2=0.2556 is positive value, also, Rn-18And Rn-2Absolute value be respectively less than
Rn-10The one third of=- 0.7372 absolute value, so, Rn-18And Rn-2Meet the criterion of step S153；
5) due to Rn-20=-0.0855 polarity and Rn-10On the contrary, and Rn=0.3954 polarity and Rn-10It is identical, also,
Rn=0.3954 more than Rn-10One third, so, Rn-20=-0.0855 and Rn=0.3954 is not satisfied step S154's
Criterion；Therefore, the relevant peaks in Fig. 8 (a) are an invalid spurious correlation peaks.
In Fig. 8 (b):
RD,nFor -0.6184,0.4263,0.2136, -0.4795,0.7743, and -0.8253,0.58, -0.2477,
0.3277 }, the detection process of relevant peaks is as follows:
1) due to Rn-10=0.7743 is RD,nMiddle numerical value is maximum, also, its absolute value is greater than targets threshold, meets step
The peak-peak testing conditions of S14, so, Rn-10Corresponding relevant peaks may be a positive correlation peak；
2) due to Rn-13=-0.4795 and Rn-7=-0.8253 is negative value, also, Rn-13And Rn-7Absolute value be more than
Rn-10The one third of=0.7743 absolute value, so, Rn-13=-0.4795 and Rn-7=-0.8253 is all satisfied step S151's
Criterion；
3) due to Rn-16=0.2136 and Rn-4=0.58 is positive value, also, Rn-16=0.2136 and Rn-4=0.58 with
Rn-10=0.7743 polarity is identical, so, Rn-16=0.2136 and Rn-4=0.58 meets the criterion of step S152；
4) due to Rn-2=-0.2477 is negative value, also, Rn-2Absolute value be respectively less than Rn-10The three of=0.7743/
One, so, Rn-2=-0.2477 meets the criterion of step S153；
5) due to Rn-20=-0.6184 polarity and Rn-10On the contrary, and RnAlthough=0.3277 polarity and Rn-10It is identical,
But Rn=0.3277 more than Rn-10=0.7743 one third, so, Rn-20=-0.6184 and Rn=0.3277 is discontented
The criterion of sufficient step S154；Therefore, the relevant peaks in Fig. 8 (b) are an invalid spurious correlation peaks.
Obviously, provided method can make full use of wave character possessed by relevant peaks to come to mesh through this embodiment
The relevant peaks of mark power line communication leading character are detected, and thus opposite can be reduced and be detected in relevant peaks detection process
As a result the influence degree of suffered outside noise and impulse disturbances can thus greatly improve before to the communication of target power line
Lead the confidence level in symbol relevant peaks detection process.
Fig. 9 is referred to, Fig. 9 is a kind of detection dress of power line communication leading character relevant peaks provided by the embodiment of the present invention
The structure chart set, the detection device include:
Sampled point obtains module 21, for being based on G3-PLC standard, signal sampling is carried out to target power line, to obtain mesh
Power line is marked in the destination sample point sequence at current time；
Correlation obtains module 22, for destination sample point sequence and default SYNCP sampling point sequence to be carried out cross-correlation
Operation obtains correlation of the target power line under current time；
First judgment module 23 obtains correlation sequence for obtaining target power line in the correlation of M different moments
Column, and judge the first correlation that whether there is maximum absolute value in sequence of correlation values；Wherein, M >=3；
Second judgment module 24, for when the judgement result of first judgment module, which is, is, then judging the first correlation
Whether absolute value is greater than preset threshold；
Third judgment module 25, used in when the judgement result of the second judgment module, which is, is, being then with the first correlation
The heart judges in sequence of correlation values with the presence or absence of the multiple target correlations for meeting relevant peaks wave character；
4th judgment module 26, for when the judgement result of third judgment module be when, then by the first correlation institute it is right
The relevant peaks answered are determined as effective relevant peaks.
A kind of detection device of power line communication leading character relevant peaks provided by the embodiment of the present invention has aforementioned institute public
Beneficial effect possessed by a kind of detection method for the power line communication leading character relevant peaks opened.
0, Figure 10 is a kind of detection of power line communication leading character relevant peaks provided by the embodiment of the present invention referring to Figure 1
The structure chart of equipment, the detection device include:
Memory 31, for storing computer program；
Processor 32 realizes a kind of power line communication leading character as previously disclosed when for executing the computer program
The step of detection method of relevant peaks.
A kind of detection device of power line communication leading character relevant peaks provided by the embodiment of the present invention has aforementioned institute public
Beneficial effect possessed by a kind of detection method for the power line communication leading character relevant peaks opened.
Correspondingly, the embodiment of the invention also provides a kind of computer readable storage medium, computer readable storage medium
On be stored with computer program, realized when computer program is executed by processor such as aforementioned disclosed power line communication leading character
The step of detection method of synchronous relevant peaks.
A kind of computer readable storage medium provided by the embodiment of the present invention, with a kind of aforementioned disclosed power line
Communicate beneficial effect possessed by the detection method of leading character relevant peaks.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.For being filled disclosed in embodiment
For setting, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part
Explanation.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Above to a kind of detection method of the synchronous relevant peaks of power line communication leading character provided by the present invention, device, set
Standby and medium is described in detail, and specific case used herein explains the principle of the present invention and embodiment
It states, the above description of the embodiment is only used to help understand the method for the present invention and its core ideas；Meanwhile for this field
Those skilled in the art, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, to sum up institute
It states, the contents of this specification are not to be construed as limiting the invention.
Claims (8)
1. a kind of detection method of power line communication leading character relevant peaks characterized by comprising
Based on G3-PLC standard, signal sampling is carried out to target power line, to obtain the target power line at current time
Destination sample point sequence；
The destination sample point sequence and default SYNCP sampling point sequence are subjected to computing cross-correlation, obtain the target power
Correlation of the line under current time；
Correlation of the target power line in M different moments is obtained, sequence of correlation values is obtained, and judges the correlation sequence
It whether there is the first correlation of maximum absolute value in column；Wherein, M >=3；
If so, judging whether the absolute value of first correlation is greater than preset threshold；
If so, being judged centered on first correlation special with the presence or absence of relevant peaks waveform is met in the sequence of correlation values
Multiple target correlations of sign；
If so, relevant peaks corresponding to first correlation are determined as effective relevant peaks.
2. detection method according to claim 1, which is characterized in that described to obtain the target power line in M difference
The correlation at moment obtains the process of sequence of correlation values, comprising:
The target power line is obtained in M different moments, and there is the correlation of not constant duration, obtains the correlation
Sequence.
3. detection method according to claim 1, which is characterized in that described by the destination sample point sequence and default
SYNCP samples point sequence and carries out computing cross-correlation, after obtaining the process of the correlation at current time, further includes:
If correlation of the target power line in M different moments has not been obtained, execute again described based on G3-PLC mark
Standard, the step of signal sampling is carried out to target power line, until get the target power line in the correlation of M different moments
Value.
4. detection method according to any one of claims 1 to 3, which is characterized in that described to be with first correlation
Center judges in the sequence of correlation values with the presence or absence of the process for the multiple target correlations for meeting relevant peaks wave character, packet
It includes:
Judge that the sequence of correlation values whether there is and first phase in any side centered on first correlation
The polarity of pass value on the contrary, and absolute value be greater than the second correlation of targets threshold；Wherein, the targets threshold is according to described the
Value set by one correlation；
If so, judge the sequence of correlation values any side centered on first correlation whether there is with it is described
The identical third correlation of the polarity of first correlation；
If so, judge the sequence of correlation values any side centered on first correlation whether there is with it is described
The polarity of first correlation on the contrary, and absolute value be less than the 4th correlation of the targets threshold；
If so, judge the sequence of correlation values any side centered on first correlation whether there is with it is described
The polarity of first correlation is identical, and absolute value is less than the 5th correlation of the targets threshold；
If so, executing described the step of relevant peaks corresponding to first correlation are determined as effective relevant peaks.
5. detection method according to claim 4, which is characterized in that the judgement sequence of correlation values is with described the
Any side centered on one correlation whether there is the polarity with first correlation on the contrary, and absolute value be greater than target threshold
After the process of second correlation of value, further includes:
If it is not, signal sampling is carried out to target power line, based on G3-PLC standard described in then re-executing to obtain the target
Power line the destination sample point sequence at current time the step of, until the absolute value of first correlation be greater than it is described default
Threshold value.
6. a kind of detection device of power line communication leading character relevant peaks characterized by comprising
Sampled point obtains module, for being based on G3-PLC standard, signal sampling is carried out to target power line, to obtain the target
Destination sample point sequence of the power line at current time；
Correlation obtains module, for the destination sample point sequence and default SYNCP sampling point sequence to be carried out cross-correlation fortune
It calculates, obtains correlation of the target power line under current time；
First judgment module obtains sequence of correlation values for obtaining the target power line in the correlation of M different moments,
And judge the first correlation that whether there is maximum absolute value in the sequence of correlation values；Wherein, M >=3；
Second judgment module, for when the judgement result of the first judgment module, which is, is, then judging first correlation
Absolute value whether be greater than preset threshold；
Third judgment module, for when the judgement result of second judgment module, which is, is, being then with first correlation
Center judges in the sequence of correlation values with the presence or absence of the multiple target correlations for meeting relevant peaks wave character；
4th judgment module, for when the judgement result of the third judgment module be when, then by the first correlation institute
Corresponding relevant peaks are determined as effective relevant peaks.
7. a kind of detection device of the synchronous relevant peaks of power line communication leading character characterized by comprising
Memory, for storing computer program；
Processor is realized when for executing the computer program as a kind of power line described in any one of claim 1 to 5 is logical
The step of believing the detection method of leading character relevant peaks.
8. a kind of computer readable storage medium, which is characterized in that be stored with computer on the computer readable storage medium
Program is realized when the computer program is executed by processor as power line communication described in any one of claim 1 to 5 is leading
The step of according with the detection method of synchronous relevant peaks.
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