CN103916207A - Active device and method for interfering multi-frequency-band power line communication - Google Patents
Active device and method for interfering multi-frequency-band power line communication Download PDFInfo
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Abstract
The invention relates to an active device and method for interfering multi-frequency-band power line communication, and belongs to the related technical fields of power line transmission, power line communication, power line interference, information safety, a power network, communication and the like. The active device and method are mainly used for interfering multi-frequency-band power line communication. The active device comprises a power module, a coupling circuit, a power self-adaptation interfering source module, an impedance matching device and a driving module. According to the active device and method, narrow-band power line communication devices in various frequency bands can be interfered, and the frequency band ranges of the frequency bands can be inquired in the international standard for narrow-band power line communication; power line communication is interred through power self-adaptation active noise signals, the power self-adaptation power line communication devices can be interfered, the interfering capacity is improved, and energy is saved.
Description
Technical field
The present invention relates to a kind of active multiband power line communication jamming equipment and method, belong to the correlative technology fields such as power line transmission, power line communication, power line interference, information security, electric power networks and communication, be mainly used in the power line communication of multiband to obstruct.
Background technology
Due to technical development, the cable LAN application threshold based on arrowband power line communication is very low, and starts to popularize.It is very little that arrowband power line transmission equipment can do, and switch on power and just can transmit.Therefore as application such as power line is checked meter, power line call transmissions, for the lives of the people are provided convenience.As the X-10 agreement and the relevant device that originate from the U.S. can carry out Long-distance Control to electronic equipment by power line; Rui Lang group has developed its amplifier apparatus in recent years, has further promoted the use of power line device.
About the intellectual property output of power line communication and jamming equipment aspect thereof, there are following several:
Power line application aspect has: " based on the intelligent electric meter of power line network transmission " (patent No. CN201320030263.8) proposed a kind of with processor, please be able to carry out the intelligent electric meter of power line communication, finally realized automatic data logging." a kind of cloud air-conditioning system based on power line transmission signals " (patent No. CN201210425589.0), unites two into one power line used cloud air-conditioning and network signal line, has reduced laying and the cost of circuit, has facilitated people's life.
Aspect power line antijam communication, having: utility model patent " power line carrier anti-interference communication device " (patent No. CN201020161616.4) has provided a kind of anti-interference method and equipment of power line carrier communication, overcome power line interference and easily damaged communicating terminal and the defect that causes communication error code, realize the efficient communication of low-voltage power line carrier, reduced equipment damage.In addition invention " device that the suppressor pulse in a kind of electric line communication system disturbs " (application number: 03105317.3), proposed interference protection measure for impulse disturbances especially; The method and apparatus that invention " noise suppression circuit of using in power line channel powerful interference signal restraining device " (patent No. CN203301478U) proposes can suppress the interference of noise to power line communication.Patent of invention " inhibition method and the circuit structure thereof of voltage Power Line Carrier Channel powerful interference signal " (patent No. Patent CN103338080A) has proposed to the various forms of very noisies that may exist in the transmission channel of power line communication the method and apparatus suppressing, and has obtained good achievement.
Existing arrowband power line transmits relevant product and equipment, and its transmission band adopts 30-150KHz frequency range mostly.Power line communications apparatus Yi road signal occupies tens to 100Hz; Meeting under electromagnetic compatibility condition, power is often 0.5W-2W; In addition, power line communications apparatus is small and exquisite, reliable, makes the easy configured voice transducer of arrowband power line transmission equipment, and connects electric wire and can realize eavesdropping; Huge threat has been brought in this project implementation place to some important technical conference scene, the on-the-spot need to be keep secret of evaluation.Jamming equipment product or patent and the utility model of aforementioned relating to " transmission of arrowband power line ", mainly for low-voltage power line communication, inhibition very noisy circuit, are all mainly for arrowband power line communications apparatus.Yet there are no report for multiband, the jamming-proof power line product of active and Patents.
Summary of the invention
The object of the invention is in order to propose a kind of active multiband power line communication jamming equipment and method, this equipment can suppress power line communication and solve the problem of power line communication eavesdropping.
The object of the invention is to be achieved through the following technical solutions.
The active multiband power line communication of one of the present invention jamming equipment, this equipment comprises power module, coupling circuit, power adaptive interference source module, impedance matching box and driver module;
Described power module comprises power transformer, bridge rectifier, filter and pressurizer, and the function of power module is that civilian civil power is converted into and is applicable to the alternating current that voltage range that control below and signal link use is 3～12V.
220V alternating voltage is converted to the alternating current compared with low pressure by described power transformer, and be provided with frequency follow circuit, makes the frequency fluctuation of civil power can not affect late-class circuit.
Described bridge rectifier is unidirectional pulsating voltage by the positive and negative sinusoidal voltage rectification replacing;
Described filter carries out the mains ripple part of bridge rectifier output smoothly;
When described pressurizer makes line voltage or load variations, it is stable that the voltage of output keeps.
Described coupling circuit comprises high pass filter and adjustable transformer.The function of coupling circuit is to intercept low frequency 220V voltage signal.
Described high pass filter can be made up of filter joint network, and it filters 50Hz civil power, and high-frequency signal is held back, and through adjustable transformer, is transmitted to follow-up impedance matching module and power adaptive interference source;
Nondestructively amplifying high frequency signal of described adjustable transformer, can be identified by follow-up circuit it.
Described power adaptive interference source module is one or more sets.Every cover power adaptive interference source module comprises circuitry for signal measurement, analog-to-digital conversion module, embedded intelligence CPU module, noise signal generator and modulator.The function of power adaptive interference source module is according to power line channel condition, calculates the noise power of controlling the noise source output adaptive that produces random signal.
Described circuitry for signal measurement receives the signal that coupling circuit provides, and the voltage and current of signal is reasonably amplified, and send into analog-to-digital conversion module.
Described analog-to-digital conversion module, quantizes to send the signal sampling of high-frequency electrical line of force communication into central computation unit.
Described embedded intelligence CPU module is carried out spectrum analysis to high-frequency signal, finds the frequency spectrum at signal of communication place, and estimates the energy of its communication; And according to signal of communication place frequency band and energy information, control noise signal generator, and receive noise signal generator, produce the baseband noise of corresponding power, then control modulator baseband noise is modulated on frequency band.
Can produce with the noise signal generator described in described embedded intelligence CPU module controls the noise of certain power.
Can noise signal be modulated to specific frequency range with the modulator described in described embedded intelligence CPU module controls.Described modulator can be replaced, thereby can disturb at different frequency range, mates different application scenarioss.
Described impedance matching box is one or more sets.Every cover impedance matching box comprises impedance measuring circuit, calculating control circuit and variable capacitance inductance network; The function of impedance matching box is the output impedance of immediately measuring time-variable impedance and coupling interference source.
Described impedance measuring circuit is an active network, regards power line as a broad sense resistance, is sampled and is extracted phase place and amplitude information by circuit hardware.The position of inserting power line due to this jamming equipment is unfixing, the Shi Bianyu that causes impedance do not mated, therefore, the impedance matching box design form difference of different frequency range.
Described calculating control circuit obtains inductance or the capacity cell that amplitude-phase information that impedance measurement network provides calculates and control in rear class impedance ground adaptation and mates.
Described variable capacitance inductance network can be by prime control, and realize inductance capacitance network is carried out to combinations matches in circuit.Described impedance matching box can have a variety of forms, can specifically design the impedance matching box of different adjustable extents according to application circuit.
Described driver module comprises blower fan and blower fan drive circuit; The function of driver module is after present device switches on power, and described blower fan, under draught fan control circuit control, can, according to the watt level of power adaptive interference source, regulate the rotating speed of blower fan, the heat radiation of finishing equipment.
Many covers power adaptive interference source module based on above-mentioned and overlap impedance matching box more, embedded intelligence CPU module provides the signal strength signal intensity of different frequency range in power line channel and the position in frequency band, and control accordingly multiple signal generators and modulator, there is respectively the interference noise of different capacity and frequency range, and by different impedance matching units, noise signal is poured in power line communication channel and gone.
The active multiband power line communication of one of the present invention interference method, step is:
The method that paper " disturbs an arrowband power line communications apparatus ".
1) user learns that first user accesses electric transmission network by this active multiband power line communication jamming equipment by common plug when there being an arrowband power line communications apparatus access electric transmission network in power line.Suppose that this arrowband power line communications apparatus works in f
signal, its operating power p
signal, and user cannot learn this two parameters in advance.Separately establish receiving equipment and can long-rangely receive the band signal X being launched by transmitter
signal, transmission line power frequency is f
50.
2) power by this communication equipment of electric power source pair of module:
2.1 utilize the power transformer of power module, and 220V civil power is converted to low-voltage AC;
2.2 utilize the bridge rectifier of power module, and low-voltage AC is rectified into approximate direct current;
2.3 utilize the filter of power module, for aforementioned 2.2 direct currents that generate carry out smoothly, eliminate HFS;
The effective value of 2.4 civil powers may be in 220V left and right fluctuation, and then affects galvanic stability after rectification.Therefore utilize the pressurizer of (1) power module, direct current carried out to voltage stabilizing.
3) this communication equipment, by the cooperating of coupling circuit and power adaptive interference source module, is realized the analysis to power line communication channel in circuit and signal.
High pass filter in 3.1 coupling circuits is f by frequency
50low frequency civil power filter, by the band signal X of power line communication
signalhold back, the adjustable transformer in overcoupled circuits, is transmitted to follow-up (3) power adaptive interference source and (4) impedance matching box.In fact,, due to the existence of noise and decline, the actual signal of holding back is X '
signal+ N, X '
signalfor the signal after distortion, N is noise.
Circuitry for signal measurement, analog to digital conversion circuit and the embedded intelligence CPU module of 3.2 power adaptive interference source modules will be entered filtering picked up signal to 3.1 places and calculate, analyze.Because high frequency signal amplitude is very little, so need the high-frequency signal that first by circuitry for signal measurement, coupling circuit is sent to amplify and send into analog to digital conversion circuit.Analog to digital conversion circuit is used than the conventional higher sample rate of frequency range of relative arrowband power line communication and signal is sampled and quantize.Through above-mentioned steps, obtain X '
signalthe sampling X ' of+N
signal(n)+N (n).Analog to digital conversion circuit is sent the above-mentioned signal after sample quantization into embedded intelligence CPU module.
3.3 according to aforementioned, primary signal X
signalfrequency domain information there is minor variations, and the high-frequency noise that superposeed, therefore the embedded intelligence CPU module in required power adaptive disturbance source module is to signal X
signalconcrete frequency range and energy estimate.The signal that first embedded intelligence CPU module obtains carries out transform domain operation, obtains its power spectrum characteristic
then adopt according to the fuzzy algorithmic approach of power line channel feature, estimate primary signal X
signalthe lower bound of the frequency range at place
and the upper bound
making the confidence level of signal within the scope of bound is 95%.Calculate subsequently the gross power of the signal obtaining after coupling
in calculating, should consider the amplification of circuitry for signal measurement.
3.4 when utilizing coupling circuit that high-frequency signal is coupled, still has Partial Power to remain in power line channel.Now can utilize the test experience of power line communication coupling, use
estimate the gross power in channel
and be stored in embedded intelligence CPU module.
4) this communication equipment, by the cooperating of power adaptive interference source module and impedance matching box, is realized generation, the modulation of interference signal, and the pouring into of interference signal
4.1 have estimated arrowband to be disturbed power line communication band information by embedded intelligence CPU module
and power information
setting after the signal to noise ratio snr=1/r disturbing, show that required interference power is
can produce power by the embedded intelligence CPU module controls noise signal generator of (3) power adaptive interference source module is subsequently
noise signal.
4.2 utilize the modulator in power adaptive interference source module, and the noise signal in 4.1 is modulated to lower bound
and the upper bound
centre.
4.3 for the noise signal on the frequency band of 4.2 generations is input on power line, need to mate power line impedance and noise source impedance.Utilize the impedance matching box in power adaptive interference source module, and in conjunction with the computing capability of embedded intelligence CPU module, the coupling that can carry out output impedance, and then the power of noise source is exported in power line.Different power line networks can be applied different impedance matching boxs, and then realizes noise power and fully export.
5) this communication equipment is realized the heat radiation of equipment by driver module, and then guarantees stability and the fail safe of its work.
The voltage and current that blower fan drive circuit in 5.1 driver modules is exported by monitoring power supply module, monitors the overall power of this equipment.
5.2 equipment of monitoring in 5.1 reach after the threshold value of setting, and blower fan drive circuit drives the blower fan in (5) driver module to carry out work, starts active heat removal.
Generally, said method has been realized a feedback control system, and utilizing the arrowband electric-power wire communication signal of measuring and estimate is feedback variable, has produced noise signal, and produces interference.
Under briefly introduce the method for " multiple arrowbands power line communications apparatus is disturbed simultaneously ".
The key step of this method is consistent with " an arrowband power line communications apparatus is disturbed ", in a kind of front method, only has the frequency range of an arrowband power line communication.Latter has multiple communications bands; Mutually deserved, in an equipment, need many cover power adaptive interference source modules, comprising: circuitry for signal measurement, analog-to-digital conversion module, embedded intelligence CPU module, noise signal generator, modulator.And many cover impedance matching boxs comprise impedance measuring circuit, calculating control circuit and variable capacitance inductance network.Repeating above-mentioned 1), 2), 3), 4) after step, multiple arrowbands power line communication frequency band is disturbed.
Beneficial effect
1) the present invention can implement to disturb to the arrowband power line communication apparatus of various frequency ranges (adding band limits to look into the international standard of arrowband power line communication).
2) the present invention has adopted the active noise signal of power adaptive to disturb power line communication, can resist the power line communications apparatus of power adaptive, strengthens interference performance, and energy savings.
3) the present invention, by the frequency sweep analysis of setting frequency range, can search out the frequency range at most probable signal of communication place, finally realizes the interference band self adaptation of (specializing frequency range) in KHz magnitude.
4) this power line communication jamming equipment is a kind of novel safety information product, and it,, by producing random noise, drops to the signal to noise ratio of destination channel frequency range extremely low.
5) in the place of need to be keep secret, this equipment is inserted in any one wire and plug, go for disturbing the work of potential power line communication interception facility.
6) power line communications apparatus cannot be sent normal signal of communication by power line.
7) the present invention, on power line communications apparatus basis, conventional arrowband, is modulated to required signal transmission in multiple tens KHz communication channel frequency ranges, can, according to the difference of concrete implementation environment, dynamically adjust number of frequency bands and width.When enforcement, the present invention is accessed to power line local area network (LAN) by supply socket, can realize wide-band to the power line communication in this local area network (LAN) and disturb.
8) the present invention is directed to the demand that needs blocking-up power line communication to prevent power line eavesdropping, a kind of active multiband power line communication interference method and equipment have been proposed, concrete, the present invention adopts embedded intelligence hardware circuit to receive the signal in power line communication channel, carry out after sample quantization, according to different implementation environments, with the each frequency band signals power in intelligent CPU module analysis power line wherein, select different modulating device, initiatively produce noise signal, and be modulated on multiband, realize the signal to noise ratio that reduces wider frequency section communication channel, thereby block adaptively power line eavesdropping.
Accompanying drawing explanation
Fig. 1 a is active fixing one-segment power line communication jamming equipment (comprising power module and the driver module) system block diagram in the embodiment of the present invention 1; Fig. 1 b is the system block diagram of the active self adaptation frequency range power line communication jamming equipment (in order to observe conveniently, having left out power module and driver module) in the embodiment of the present invention 2;
Fig. 2 is the schematic diagram of embodiment 1 and embodiment 2, is an embodiment who arrowband power line communication is disturbed with the active fixing one-segment power line communication jamming equipment of Fig. 1 a or with the active self adaptation frequency range of Fig. 1 b power line communication jamming equipment;
Fig. 3 is the system block diagram of the active multiband power line communication jamming equipment in the embodiment of the present invention 3, in order to observe conveniently, has left out power supply, blower fan and driving thereof.
Fig. 4 is an embodiment who arrowband power line communication is disturbed with the system of jamming equipment shown in Fig. 3.
Embodiment
For distinct principle of the present invention, category and enforcement, to the present invention " a kind of active multiband power line communication interference method and equipment ", with each accompanying drawing, the technical scheme in the embodiment of the present application is known to complete description below in conjunction with the embodiments.
Embodiment 1
The present embodiment is the embodiment of " a kind of active multiband power line communication jamming equipment ", employing be active fixing one-segment power line communication jamming equipment.Fig. 1 a and 1b and Fig. 2 are the schematic diagrames of the present embodiment.Fig. 1 b is active multiband power line communication jamming equipment, and wherein 1.2 is coupling circuit, and 1.4 is impedance matching network, and 1.5 is power adaptive interference source module.In the present embodiment, treat that interference band is fixing known, Fig. 1 b equipment can abbreviation be equipment shown in Fig. 1 a, and wherein 1.1 is power module and driver module.The 1.2nd, coupling circuit, the 1.3rd, power adaptive interference source module, the 1.4th, impedance matching box.Fig. 2 is its system block diagram, wherein 2.21 and 2.22 is respectively arrowband electric line communication system transmitting and receiving device; 2.1 is active arrowband power line communication jamming equipment.
Embodiment 2
The present embodiment is the embodiment of " a kind of active multiband power line communication jamming equipment ", adopts active multiband power line communication jamming equipment equipment.Fig. 1 b and Fig. 2 are the schematic diagrames of the present embodiment.The application scenarios of the present embodiment is power line local area network (LAN), in actual applications, often do not know the concrete frequency range that power line communications apparatus adopts, now need adaptive transformation frequency range, therefore adopt the active electric line of force communication jamming device in embodiment 2, the interference band of this communication jamming device is variable.As shown in Figure 2, the present embodiment has accessed 2.21 in power line local area network (LAN), is certain arrowband power line communication transmitter, and in figure, 2.22 is certain arrowband power line communication receiving equipment.
In the present embodiment, certain arrowband power line communication transmitter is modulated to baseband signal on frequency band.Its centre frequency is f
signal=30KHz, the relative centre frequency of its occupied bandwidth can be ignored; Gross power p
signalunder the normal work of=0.1W, receiving equipment can long-rangely receive the band signal X being launched by transmitter
signal.Separately establishing power frequency component frequency is f
50=50Hz.
In the present embodiment, according to Fig. 2, by equipment access power line shown in Fig. 1 b.1.2 coupling circuits in Fig. 2, are formed by filter joint and low-noise level transformer cascade in the present embodiment, and high-frequency signal is coupled, and this signal is X '
signal+ N, X '
signalfor the signal after distortion, N is noise.Signal is coupled circuit high-frequency signal is transferred to 1.5 power adaptive interference source modules in Fig. 1 subsequently.
Circuitry for signal measurement is by X '
signal+ N amplifies after 100 times and sends into the D/A converting circuit in 1.5, by the sample rate of 100KHz, utilize sampling hold circuit to sample and carry out 8 uniform quantizations.Now obtain digital signal X '
signal(n)+N (n), sends into 1.5 embedded intelligence CPU module and carries out analysis and calculation.
In 1.5 embedded intelligence CPU module, adopt Discrete Short Time Fourier Transform to digital signal X '
signal(n)+N (n) carries out spectrum analysis, obtains its power spectral density information.In power spectral density, find the band limits of power spectral density maximum.Then estimate the lower bound of the frequency range at electric-power wire communication signal place, arrowband with grey algorithm
and the upper bound
and the gross power that goes out primary signal according to the power change calculations of front stage circuits is less than
The power and the frequency information that utilize embedded intelligence CPU module to obtain, controlling described noise signal generator and modulator.
In this example, the adjustable noise signal generator in 1.5 is made up of a M signal generator (mould 32), Digital Controlled Power Amplifier and peripheral circuit.In this example, set the signal to noise ratio snr=1/r=1/50 disturbing; The power of noise signal generator output noise that embedded intelligence CPU module controls is adjustable
Noise signal
In this example, modulator is Digital Modulation circuit, by embedded intelligence CPU module, this noise signal is modulated to lower bound
And the upper bound
Between.
In this example, 1.4 impedance matching boxs are by frequency regulated power supply, variable LC resistor network, and constant-resistance network and sampler composition, the function that completes impedance matching need to be used the computing function of embedded intelligence CPU module.First produce a lower bound with frequency regulated power supply
and the upper bound
between the stabilized power supply of frequency 30KHz.Now 1.2 coupling circuits and power line are regarded to a resistance, connect with the resistor network of itself in circuit, sampler is to sampling the high-frequency signal after frequency regulated power supply signal, coupling, the voltage signal in constant-resistance network.Provided the impedance of coupler and powerline systems by calculating.
The impedance matching box providing in this example comprises data acquisition module, numerical control adjustable transformer inductance network.In this example, the output impedance of signal source and modulator is 100 ohm, the impedance of data collecting module collected current power line is 116-j961 ohm, and this numerical value is transported to embedded intelligence CPU module, afterwards according to the resistance value that calculates current coupler and power line, provide capacitance and inductance value that impedance matching box should be exported, then by embedded intelligence CPU module controls adjustable transformer inductance network reach expection 2uH.The impedance that result can record after coupling is that 99+j18 ohm has finally been realized impedance matching, makes the power maximum of the circuit of noise signal injection.
Now power line communication receiving equipment in arrowband receives signal X
signal, its power is less than 0.2W and X
interrupt, its power is greater than 5W, and the signal to noise ratio in real channel is 0.04=-14dB., because signal to noise ratio is too low, certain arrowband power line communication receiving equipment loses the ability of demodulation.
In the present embodiment, form on the whole a FEEDBACK CONTROL, wherein calculating control and Signal estimation and control is feedback element.
Embodiment 3
The present embodiment system block diagram as shown in Figure 3 and Figure 4.The equipment of equipment shown in Fig. 3 based on shown in Fig. 1 b, has only increased many cover opposing adaptation, noise signal source and modulators, and they carry out independent control by embedded intelligence CPU module.
See and in the present embodiment, in power line local area network (LAN), accessed multiple arrowbands power line communication transmitter (label be 1 to k=3) by Fig. 4.First suppose that it is modulated to baseband signal on frequency band, establish occupied mid-band frequency for being respectively
50KHz and
Under normal work, 3 power line communication receiving equipments can long-rangely receive the band signal of being launched by transmitter
Signal analysis link in the present embodiment and a upper embodiment are similar, after completing the measurement of power spectral density, by embedded intelligence CPU module by calculating and comparing, the number of determining arrowband power line communications apparatus is 3, and under 95% correct probability, judges respectively the lower bound of electric-power wire communication signal place band limits
and the upper bound
be respectively 29.9KHz and 30.1KHz, 39.9KHz and 40.1KHz, and 49.9KHz and 50.1KHz, and with calculating gross power be
be respectively 0.2W, 0.3W, 0.4W, these performance numbers are greater than real performance number.
Complete after corresponding data calculating, according to data group
according to the method for embodiment 2, produce the noise signal on corresponding three frequency bands by embedded intelligence CPU module controls noise signal generator, modulator composite module.Then according to the method for embodiment 2, by the impedance measurement of impedance matching box and the complete paired transmission line of embedded intelligence CPU module.The now impedance of transmitter is 180 ohm.And the impedance of circuit is 179-j1024 ohm, therefore embedded intelligence CPU module controls variable capacitance inductance network produces the inductance value of 2uH, after coupling, circuit overall impedance is 182+j1.15, substantially realizes impedance matching.
Now power line communication receiving equipment in arrowband receives signal X
k, signaland X
k, interrupt, the latter exceeds respectively that the former is many, and power line communication receiver 1 to 3 is because signal to noise ratio is too low, and it will lose the ability of demodulation.
In a word, for arrowband power line communication, the present invention, by multiple frequency ranges are disturbed, has realized reasonable interference effect.
The above is preferred embodiment of the present invention, and the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.Every those skilled in the art does not make all embodiment that obtain under creative work prerequisite, and does not depart from the equivalence completing under spirit disclosed in this invention or revise, and all falls into the scope of protection of the invention.
Claims (8)
1. an active multiband power line communication jamming equipment, is characterized in that: this equipment comprises power module, coupling circuit, power adaptive interference source module, impedance matching box and driver module;
The function of described power module is that civilian civil power is converted into and is applicable to the alternating current that voltage range that control below and signal link use is 3～12V;
The function of described coupling circuit is to intercept low frequency 220V voltage signal;
The function of described power adaptive interference source module is according to power line channel condition, controls and produces the noise source of random signal the noise power of output adaptive;
The function of described impedance matching box is the output impedance of immediately measuring time-variable impedance and coupling interference source;
Described driver module comprises blower fan and blower fan drive circuit; Blower fan is under draught fan control circuit control, and driver module can, according to the watt level of power adaptive interference source, regulate the rotating speed of blower fan, the heat radiation of finishing equipment;
Power module is whole equipment power supply, and driver module is realized the heat radiation of equipment;
In power line, all first signal passes through coupling circuit, coupling circuit is sent the high-frequency signal isolating into power adaptive interference source module, power adaptive interference source module is sent into power line by impedance matching box and coupling circuit and is realized Communication Jamming after producing and can be used in the noise signal of interference.
2. the active multiband power line communication of one according to claim 1 jamming equipment, is characterized in that: power module comprises power transformer, bridge rectifier, filter and pressurizer;
Power transformer is converted to 220V alternating voltage the alternating current of low pressure, and is provided with frequency follow circuit;
Described bridge rectifier is unidirectional pulsating voltage by the positive and negative sinusoidal voltage rectification replacing;
Described filter carries out the mains ripple part of bridge rectifier output smoothly;
When described pressurizer makes line voltage or load variations, it is stable that the voltage of output keeps.
3. the active multiband power line communication of one according to claim 1 jamming equipment, is characterized in that: coupling circuit comprises high pass filter and adjustable transformer;
Described high pass filter is made up of filter joint network, and it filters 50Hz civil power, and high-frequency signal is held back, and through adjustable transformer, is transmitted to follow-up impedance matching module and power adaptive interference source;
Nondestructively amplifying high frequency signal of described adjustable transformer, can be identified by follow-up circuit it.
4. the active multiband power line communication of one according to claim 1 jamming equipment, is characterized in that: described power adaptive interference source module is one or more sets.
5. the active multiband power line communication of one according to claim 4 jamming equipment, is characterized in that: every cover power adaptive interference source module comprises circuitry for signal measurement, analog-to-digital conversion module, embedded intelligence CPU module, noise signal generator and modulator;
Described circuitry for signal measurement receives the signal that coupling circuit provides, and the voltage and current of signal is reasonably amplified, and send into analog-to-digital conversion module;
Analog-to-digital conversion module is that the signal sampling of high-frequency electrical line of force communication is quantized to send into central computation unit;
Described embedded intelligence CPU module is carried out spectrum analysis to high-frequency signal, finds the frequency spectrum at signal of communication place, and estimates the energy of its communication; And according to signal of communication place frequency band and energy information, control noise signal generator, and receive noise signal generator, produce the baseband noise of corresponding power, then control modulator baseband noise is modulated on frequency band.
6. the active multiband power line communication of one according to claim 1 jamming equipment, is characterized in that: described impedance matching box is one or more sets.
7. the active multiband power line communication of one according to claim 6 jamming equipment, is characterized in that: every cover impedance matching box comprises impedance measuring circuit, calculating control circuit and variable capacitance inductance network;
Described impedance measuring circuit is an active network, regards power line as a broad sense resistance, is sampled and is extracted phase place and amplitude information by circuit hardware;
Described calculating control circuit obtains inductance or the capacity cell that amplitude-phase information that impedance measurement network provides calculates and control in rear class impedance ground adaptation and mates;
Described variable capacitance inductance network is by prime control, and realization is carried out combinations matches to inductance capacitance network in circuit.
8. an active multiband power line communication interference method, is characterized in that step is:
1) user learns that first user accesses electric transmission network by this equipment by plug when there being an arrowband power line communications apparatus access electric transmission network in power line;
Suppose that this arrowband power line communications apparatus operating frequency is f
signal, its operating power is p
signal, and user cannot learn this two parameters in advance; Separately establish receiving equipment and can long-rangely receive the band signal X being launched by transmitter
signal, transmission line power frequency is f
50;
2) power by this communication equipment of electric power source pair of module:
2.1 utilize the power transformer of power module, and 220V civil power is converted to low-voltage AC;
2.2 utilize the bridge rectifier of power module, and low-voltage AC is rectified into approximate direct current;
2.3 utilize the filter of power module, for aforementioned 2.2 direct currents that generate carry out smoothly, eliminate HFS;
2.4 utilize the pressurizer of power module, and direct current is carried out to voltage stabilizing;
3) this communication equipment, by the cooperating of coupling circuit and power adaptive interference source module, is realized the analysis to power line communication channel in circuit and signal;
High pass filter in 3.1 coupling circuits is f by frequency
50low frequency civil power filter, by the band signal X of power line communication
signalhold back, the adjustable transformer in overcoupled circuits, is transmitted to follow-up power adaptive interference source and impedance matching box; The actual signal of holding back is X '
signal+ N, X '
signalfor the signal after distortion, N is noise;
Circuitry for signal measurement, analog to digital conversion circuit and the embedded intelligence CPU module of 3.2 power adaptive interference source modules will be entered filtering picked up signal to 3.1 places and calculate, analyze; First the high-frequency signal of by circuitry for signal measurement, coupling circuit being sent amplifies and sends into analog to digital conversion circuit; Analog to digital conversion circuit is used than the conventional higher sample rate of frequency range of relative arrowband power line communication and signal is sampled and quantize; Then with autocorrelation method, the noise signal being produced by this equipment in circuit is removed; Through above-mentioned steps, obtain the sampling X ' of X ' signal+N
signal(n)+N (n).Analog to digital conversion circuit is sent the above-mentioned signal after sample quantization into embedded intelligence CPU module;
Embedded intelligence CPU module in 3.3 use power adaptive interference source modules is to signal X
signalconcrete frequency range and energy estimate; The signal that first embedded intelligence CPU module obtains carries out transform domain operation, obtains its power spectrum characteristic
then adopt according to the fuzzy algorithmic approach of power line channel feature, estimate primary signal X
signalthe lower bound of the frequency range at place
and the upper bound
making the confidence level of signal within the scope of bound is 95%; Calculate subsequently the gross power of the signal obtaining after coupling
3.4 use
estimate the gross power in channel
and be stored in embedded intelligence CPU module;
4) this communication equipment, by the cooperating of power adaptive interference source module and impedance matching box, is realized generation, the modulation of interference signal, and the pouring into of interference signal;
4.1 have estimated arrowband to be disturbed power line communication band information by embedded intelligence CPU module
and power information
setting after the signal to noise ratio snr=1/r disturbing, show that required interference power is
can produce power by the embedded intelligence CPU module controls noise signal generator of power adaptive interference source module is subsequently
noise signal;
4.2 utilize the modulator in power adaptive interference source module, and the noise signal in 4.1 is modulated to lower bound
and the upper bound
centre;
4.3 utilize the impedance matching box in power adaptive interference source module, and in conjunction with the computing capability of embedded intelligence CPU module, the coupling of carrying out output impedance, and then the power of noise source is exported in power line;
5) this communication equipment is realized the heat radiation of equipment by driver module;
The voltage and current that blower fan drive circuit in 5.1 driver modules is exported by monitoring power supply module, monitors the overall power of this communication equipment.
5.2 equipment of monitoring in 5.1 reach after the threshold value of setting, and blower fan drive circuit drives the blower fan in driver module to carry out work, starts active heat removal.
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| CN104242991A (en) * | 2014-08-29 | 2014-12-24 | 戴葵 | Ultra-wide-band power line carrier communication blocker structure |
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| CN106852102A (en) * | 2016-05-26 | 2017-06-13 | 上海拿森汽车电子有限公司 | One kind improves the jamproof pcb board of electric boosting steering system and earthing method |
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| CN106160794A (en) * | 2015-04-02 | 2016-11-23 | 光寿科技有限公司 | Power line communication control system |
| CN106160794B (en) * | 2015-04-02 | 2018-09-04 | 光寿科技有限公司 | power line communication control system |
| CN106849999A (en) * | 2015-12-04 | 2017-06-13 | 广东广联电子科技有限公司 | A kind of carrier telecommunication |
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| CN108345242A (en) * | 2018-01-12 | 2018-07-31 | 杭州海兴电力科技股份有限公司 | Ripple control receiving circuit and remote-control system |
| CN109495136A (en) * | 2018-12-29 | 2019-03-19 | 重庆邮电大学 | A kind of vehicle mounted electric line of force communication Adaptive impedance matching method |
| CN109474240A (en) * | 2018-12-31 | 2019-03-15 | 西安开容电子技术有限责任公司 | A kind of signal source and production method based on broadband noise generating device |
| CN110557172A (en) * | 2019-09-27 | 2019-12-10 | 南京同科科技发展有限公司 | Power line information anti-theft secret equipment |
| CN110808761A (en) * | 2019-10-21 | 2020-02-18 | 中科可来博(固安)航天电器制造有限公司 | Method for tampering stealing information on power line and preventing interference |
| CN111030730A (en) * | 2019-12-05 | 2020-04-17 | 国网天津市电力公司电力科学研究院 | Low-voltage power line noise recording and injecting system |
| CN111934720A (en) * | 2020-08-28 | 2020-11-13 | 杭州华罡智能科技有限公司 | Cross-signal-source carrier transmission circuit |
| CN111934720B (en) * | 2020-08-28 | 2021-05-28 | 杭州华罡智能科技有限公司 | Cross-signal-source carrier transmission circuit |
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