CN115865048B - Distributed power supply filtering system - Google Patents
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Abstract
The invention relates to a distributed power supply filtering system. The filter includes a total filter and a plurality of sub-filters; a first coupler in the total filter collects signals on a total power line; the first AD/DA device converts the signals on the collected main power line into analog and digital signals; the total filter processor performs clustering operation according to the signals on the total power line and the signals on the power line of the electric equipment to obtain a clustering result, and sends the clustering result to the corresponding sub-filter; a second coupler in the sub-filter collects signals on the power line of the electric equipment; the second AD\DA device converts the acquired signals on the electric power line of the electric equipment into analog and digital signals; the sub-filter processor carries out filter processing on signals on the electric power line of the electric equipment according to the clustering result; the invention can improve the filtering effect and reduce the complexity of the algorithm.
Description
Technical Field
The invention relates to the field of power filters, in particular to a distributed power filtering system.
Background
In a confidential office environment, power access is required for computer devices, communication devices, and network devices. With the development of power line carrier communication (Power line Communication, PLC) technology and electromagnetic radiation signal acquisition technology, a common power access line may have a potential safety hazard of information leakage.
The leakage of the voltage power line has three major approaches: firstly, communication is carried out through a power carrier, and communication signals are easily intercepted, so that communication information is obtained; and secondly, electromagnetic radiation signals of the computer equipment and the communication equipment are coupled into the power line, so that information leakage is caused. Receiving or interpreting radiated electromagnetic signals has become a common means of eavesdropping; thirdly, embedding an integrated power carrier communication chip in the equipment, and intercepting national security information through a power line.
The existing technical means for coping with the leakage of the power line mainly comprise a band-pass filter, a shielding mode and a scrambling mode. The band-pass filter is used for effectively filtering the frequency points of the specific frequency or the frequencies outside the frequency points in the power line. But cannot filter out communication signals within the filter passband and may interfere with normal power carrier communications. The shielding mode mainly reduces electromagnetic radiation signals in the power line by shielding the power line, but can not prevent the pre-buried power carrier communication from being divulged. The scrambling mode mainly adds the co-channel interference signal into the communication signal, so that the receiving end cannot extract the effective signal. However, the higher harmonics of the computer or other devices can be in the frequency range of 10MHz-1GHz or higher, and the frequency range of the power carrier communication is also from 3kHz-30MHz, so that the signal in such a wide frequency band is subjected to scrambling operation, and the processing complexity is high.
Disclosure of Invention
The invention aims to provide a distributed power supply filtering system which can improve the filtering effect and reduce the complexity of an algorithm.
In order to achieve the above object, the present invention provides the following solutions:
a distributed power filtering system, comprising: a total filter and a plurality of sub-filters; the total filter is arranged on a total power line; the plurality of sub-filters are correspondingly arranged on the power line of the electric equipment;
the total filter includes: the first coupler, the first AD\DA device and the total filter processor; the first coupler is used for collecting signals on the integrated power line; the first AD/DA device is used for converting the signals on the collected total power line into analog and digital signals; the total filter processor is used for carrying out clustering operation according to signals on the total power line and signals on the power line of the electric equipment to obtain a clustering result, and sending the clustering result to the corresponding sub-filter;
the sub-filter includes: the second coupler, the second AD\DA device and the sub-filter processor; the second coupler is used for collecting signals on the power line of the electric equipment; the second AD/DA device is used for converting the acquired signals on the electric power line of the electric equipment between analog and digital signals; the sub-filter processor is used for carrying out filter processing on signals on the power line of the electric equipment according to the clustering result; the signal comprises: a radiated signal or a PLC communication signal.
Optionally, the total filter processor includes: the system comprises a first fast Fourier transform module, a signal discrimination module and a first communication module;
the first fast Fourier transform module is used for performing fast Fourier transform on signals on the main power line and determining frequency components of the signals on the main power line, and phases and amplitudes of the corresponding frequency components;
the signal discrimination module is used for carrying out clustering operation on signals on the electric equipment power line and signals on the total power line, and acquiring the number of the signals and the corresponding electric equipment power line;
the first communication module is used for communication between the total filter and the sub-filter.
Optionally, the clustering operation is a k-means algorithm.
Optionally, the sub-filter processor includes: the device comprises a second fast Fourier transform module, a filtering module and a second communication module;
the second fast Fourier transform module is used for performing fast Fourier transform on signals on the electric power line of the electric equipment and determining frequency components of the signals on the electric power line of the electric equipment, and phases and amplitudes of the corresponding frequency components;
the filtering module is used for carrying out filtering treatment on signals on the electric power line of the electric equipment according to the clustering result;
the second communication module is used for communicating between the sub-filter and the total filter.
Optionally, the filtering process includes: adaptive filtering and scrambling operations.
Optionally, the communication protocol is universal serial bus (Universal Serial Bus, USB), serial port or ethernet.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a distributed power supply filtering system, wherein a total filter is used for collecting signals on a total power line and controlling a sub-filter; the sub-filter is used for collecting signals on the power line of the electric equipment and filtering the signals on the power line. The total filter performs clustering operation on the acquired signals, and generates reference signals or Gaussian white noise of the adaptive filter according to the radiation signals or the PLC communication signals respectively; and the sub-filter processor performs self-adaptive filtering or Gaussian white noise scrambling operation on the radiation signals or the PLC communication signals in the power line according to the clustering result. Therefore, the invention can cluster and distinguish the radiation signals or the PLC communication signals, and respectively perform self-adaptive filtering or scrambling operation, thereby improving the filtering effect and reducing the complexity of the algorithm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a distributed power filtering system according to the present invention;
fig. 2 is a schematic diagram of an overall structure of a distributed power filtering system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a distributed power supply filtering system which can improve the filtering effect and reduce the complexity of an algorithm.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 1 is a schematic structural diagram of a distributed power filtering system provided by the present invention, and fig. 2 is a schematic structural diagram of an overall structure of a distributed power filtering system provided by the present invention, as shown in fig. 1 and fig. 2, where the distributed power filtering system provided by the present invention includes: a total filter and a plurality of sub-filters; the total filter is arranged on a total power line; the plurality of sub-filters are correspondingly arranged on the power line of the electric equipment;
the total filter includes: the first coupler, the first AD\DA device and the total filter processor; the first coupler is used for collecting signals on the integrated power line; the first AD/DA device is used for converting the signals on the collected total power line into analog and digital signals; the total filter processor is used for carrying out clustering operation according to signals on the total power line and signals on the power line of the electric equipment to obtain a clustering result, and sending the clustering result to the corresponding sub-filter;
the sub-filter includes: the second coupler, the second AD\DA device and the sub-filter processor; the second coupler is used for collecting signals on the power line of the electric equipment; the second AD/DA device is used for converting the acquired signals on the electric power line of the electric equipment between analog and digital signals; the sub-filter processor is used for carrying out filter processing on signals on the power line of the electric equipment according to the clustering result; the signal comprises: a radiated signal or a PLC communication signal. The communication protocol is universal serial bus, serial port or ethernet.
The total filter processor includes: the system comprises a first fast Fourier transform module, a signal discrimination module and a first communication module;
the first fast Fourier transform module is used for performing fast Fourier transform on signals on the main power line and determining frequency components of the signals on the main power line, and phases and amplitudes of the corresponding frequency components; i.e.
，
，/>
Wherein->
And M is the frequency number of the signal obtained by the total filter.
The signal discrimination module is used for discriminating signals on the power line of electric equipment
And signal on the total power line +.>
Clustering operation is carried out, and the number of signals and corresponding electric equipment power lines are obtained;
the signal discriminating module will
And->
The amplitude of the medium signal is smallAt threshold->
Frequency bin removal of (1), if->
Corresponding tof n,i =0，/>
The method comprises the steps of carrying out a first treatment on the surface of the If->
Corresponding tof s,i =0，/>
The purpose of this operation is to eliminate frequency components in the signal that are too small in amplitude and do not cause information leakage, ready for subsequent signal clustering. Threshold->
Is the amplitude of the gaussian white noise in the environment.
The first communication module is used for communication between the total filter and the sub-filter.
The clustering operation is a k-means algorithm.
The clustering process is as follows:
the input sample is
Randomly selecting k samples from D as initial mean vector
repeat
Order the
for
/>
Calculation ofSample and respective mean vector
Distance of (2): />
In the formula->
Is the j-th sample in D; determining +.>
Cluster marking of (c): />
The method comprises the steps of carrying out a first treatment on the surface of the Sample->
Grouping into corresponding clusters: />
end for
for
do
Calculating a new mean vector:
；/>
is a cluster->
Number of samples in (3)
if
Updating the current mean vector to
else
Keeping the current mean vector unchanged
end if
end for
The unitil current mean vectors are all updated
And (3) outputting: cluster partitioning
The signal discrimination modules are sequentially aligned
Is processed.
When the cluster isC i When the samples comprise signal frequencies from at least 2 sub-filters, i.e.
And n has at least 2 values, which can be considered as a clusterC i The signals in (a) exist in a plurality of power lines and can be radiated from electric equipment, and the signals are clustered at the momentC i The signal in (a) adopts an adaptive filtering operation. Clustered designC i The value range of n is
Let->
，/>
Is a clusterC i In (a)n i The amplitude of the x-th signal frequency point of the path signal is +.>
Is a clusterC i In (a)n i The signal intensity of the way signal is selected to be the largest +.>
Corresponding ton i The path signal is subjected to inverse Fourier transform to obtain a reference signal of the adaptive filterS r,i 。
When the cluster isC i If the samples of the signal include only 1 sub-filter, the signal may be a PLC communication signal. Clustered designC i The medium signal is
The center frequency of the signal is +.>
Bandwidth ofB n,i =f n,y -f n,x Maximum amplitude is +.>
. For clustersC i Is required to generate a signal with a bandwidth ofB n,i The center frequency isf n,c Amplitude is->
White gaussian noise of (c)S o,i 。
The total filter clusters the result, reference signalS r,i White gaussian noiseS o,i And transmitted to each sub-filter through the communication module.
The sub-filter processor includes: the device comprises a second fast Fourier transform module, a filtering module and a second communication module;
the second fast Fourier transform module is used for performing fast Fourier transform on signals on the electric power line of the electric equipment and determining frequency components of the signals on the electric power line of the electric equipment, and phases and amplitudes of the corresponding frequency components; i.e.
，/>
，/>
The present invention relates to a method for manufacturing a semiconductor deviceIn the process, ,
the signal obtained by the sub-filter n is represented by M, which is the number of signal frequencies.
The filtering module is used for carrying out filtering treatment on signals on the electric power line of the electric equipment according to the clustering result;
the second communication module is used for communicating between the sub-filter and the total filter.
The filtering process includes: adaptive filtering and scrambling operations.
And the filtering module of the sub-filter performs filtering operation on the signals in the power line according to the clustering result. Let the signal collected by the nth sub-filter be located in q clusters,
obtaining +.>
Reference signalsS r,i B Gaussian white noiseS o,i ，/>
，/>
. The sub-filter n can reduce Gaussian white noiseS o,i Scrambling directly into the nth powered device power line through a coupler, but requires the reference signal to be fedS r,i And the power line is coupled to the power line of the nth electric equipment after being multiplied by the filter coefficient. Set corresponding reference signalS r,i The filter coefficient of (2) is +.>
The filter output is +.>
. After the filter is setC i The signal from the nth sub-filter is +.>
Corresponding amplitude is
。/>
Can solve by iteration +.>
Obtained, even after filteringC i The signal from the nth sub-filter is as small as possible.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. A distributed power filtering system, comprising: a total filter and a plurality of sub-filters; the total filter is arranged on a total power line; the plurality of sub-filters are correspondingly arranged on the power line of the electric equipment;
the total filter includes: the first coupler, the first AD\DA device and the total filter processor; the first coupler is used for collecting signals on the integrated power line; the first AD/DA device is used for converting the signals on the collected total power line into analog and digital signals; the total filter processor is used for carrying out clustering operation according to signals on the total power line and signals on the power line of the electric equipment to obtain a clustering result, and sending the clustering result to the corresponding sub-filter;
the sub-filter includes: the second coupler, the second AD\DA device and the sub-filter processor; the second coupler is used for collecting signals on the power line of the electric equipment; the second AD/DA device is used for converting the acquired signals on the electric power line of the electric equipment between analog and digital signals; the sub-filter processor is used for carrying out filter processing on signals on the power line of the electric equipment according to the clustering result; the signal comprises: a radiated signal or a PLC communication signal.
2. A distributed power filtering system according to claim 1 wherein said overall filtering processor comprises: the system comprises a first fast Fourier transform module, a signal discrimination module and a first communication module;
the first fast Fourier transform module is used for performing fast Fourier transform on signals on the main power line and determining frequency components of the signals on the main power line, and phases and amplitudes of the corresponding frequency components;
the signal discrimination module is used for carrying out clustering operation on signals on the electric equipment power line and signals on the total power line, and acquiring the number of the signals and the corresponding electric equipment power line;
the first communication module is used for communication between the total filter and the sub-filter.
3. A distributed power filtering system according to claim 1 or claim 2, wherein the clustering operation is a k-means algorithm.
4. A distributed power filtering system according to claim 1 wherein said sub-filter processor comprises: the device comprises a second fast Fourier transform module, a filtering module and a second communication module;
the second fast Fourier transform module is used for performing fast Fourier transform on signals on the electric power line of the electric equipment and determining frequency components of the signals on the electric power line of the electric equipment, and phases and amplitudes of the corresponding frequency components;
the filtering module is used for carrying out filtering treatment on signals on the electric power line of the electric equipment according to the clustering result;
the second communication module is used for communicating between the sub-filter and the total filter.
5. A distributed power filtering system according to any one of claims 1 or 4, wherein the filtering process comprises: adaptive filtering and scrambling operations.
6. A distributed power filtering system according to claim 1, wherein the communication protocol is universal serial bus, serial port or ethernet.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2927203A1 (en) * | 2008-02-04 | 2009-08-07 | France Telecom | Analog-digital conversion method for large band multicarrier analog signal in e.g. power line carrier communication system, involves weighting filtered analog signals by applying gains, and adding digital signals into unique signal |
| CN103560843A (en) * | 2013-11-08 | 2014-02-05 | 成都立鑫新技术科技有限公司 | Power line information monitoring method and monitoring device thereof |
| CN110557170A (en) * | 2018-06-04 | 2019-12-10 | 永林电子(上海)有限公司 | Power line carrier communication architecture suitable for indoor environment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2927203A1 (en) * | 2008-02-04 | 2009-08-07 | France Telecom | Analog-digital conversion method for large band multicarrier analog signal in e.g. power line carrier communication system, involves weighting filtered analog signals by applying gains, and adding digital signals into unique signal |
| CN103560843A (en) * | 2013-11-08 | 2014-02-05 | 成都立鑫新技术科技有限公司 | Power line information monitoring method and monitoring device thereof |
| CN110557170A (en) * | 2018-06-04 | 2019-12-10 | 永林电子(上海)有限公司 | Power line carrier communication architecture suitable for indoor environment |
Non-Patent Citations (1)
| Title |
|---|
| 基于全相位滤波技术的FBG降噪解调算法;刘琨;李鑫;江俊峰;黄翔东;张皓杰;王超;刘畅;刘铁根;;光子学报(第05期);全文 * |
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