CN112564736A - Dynamic blocking device and method for monitoring carrier communication of scrambling code injection type power line - Google Patents
Dynamic blocking device and method for monitoring carrier communication of scrambling code injection type power line Download PDFInfo
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Abstract
The invention discloses a scrambling code injection type power line carrier communication monitoring dynamic blocking device and a method, which comprise a power line signal monitoring unit, a processing unit, a control logic unit, a frequency conversion scrambling code generator, a dynamic initial value resetting scrambling code generator, a natural noise signal generator, a first preposed nonlinear amplification unit, a second mixed preposed nonlinear amplification unit, a first broadband power push-pull amplifier, a second broadband power push-pull amplifier, a first coupler and a second coupler. The invention can start the interference information source to implement the whole interference of the scrambling code injection type with full frequency domain, no leakage and high safety on the carrier communication frequency band of the power line when the suspected carrier signal or other electromagnetic signals are monitored on the power line, and block possible carrier communication; the power line can be effectively protected safely, the influence on the electromagnetic environment of the power line can be reduced to the maximum extent, and the intelligent application of power line carrier communication blocking is well realized.
Description
Technical Field
The invention relates to the technical field of information safety, in particular to a dynamic blocking device and a dynamic blocking method for scrambling code injection type power line carrier communication monitoring.
Background
With the continuous development of power line carrier communication technology, the application field of the power line carrier communication technology is continuously widened, and the power line carrier communication technology is widely applied to the aspects of industrial control, various meter reading systems, sensor networks, combustible gas detection systems, intelligent furniture control, video signal transmission and the like; more importantly, the system can carry out broadband carrier transmission, carry out data communication at high speed, steal the confidential information of important information systems and equipment, and carry out system attack with greater danger. The existing protection device in China at present is supported by an LC low-pass filter basically by using the technology, although the problem of power line carrier communication protection can be solved, the low-pass filter mainly comprises electronic elements such as an inductor and a capacitor, the power of the low-pass filter is determined by the current of the inductor, the larger the power is, the thicker the wire diameter of an inductor lead is required to be, the larger the volume of the capacitor is, and the larger the volume of the low-pass filter consisting of the inductor and the capacitor is; and further, the requirement of the matched connector is high, and the difficulty is high. And the maximum use power of the power line carrier communication blocking device in the current market can only reach 2200W, which seriously restricts the use of a plurality of devices and systems. And the number of the devices applied in general occasions is large, so that the working environment, the equipment layout and the attractiveness are influenced. In addition, the electronic characteristics are limited by some disadvantages, such as the bandwidth of the protection, especially the power, which is difficult to satisfy the requirements of some users.
Patent document No. CN103856242B discloses a power line communication interference device, which includes a power line interface, a dc power supply, a power line coupling filter, a power amplifier, and an interference signal generator; the technology conveniently accesses the power line interference device into the power line through the forms of a power line socket, a slot, a socket and the like to generate an interference signal which interferes power line communication; the interference effect is good by using extremely low interference power, the power consumption is low, and the method is particularly suitable for low-power-consumption interference application.
However, the detection of the technology mainly focuses on scanning detection of a single carrier or multiple carriers (self-called multi-band), which analyzes signal characteristics, cyclic prefixes, pilots and the like, and has a low detection speed. For burst signals and small-batch data transmission, the discovery probability is greatly reduced, and even the discovery cannot be performed. The efficiency of detection is further reduced if hundreds of carrier communications are present at the same time within the entire available carrier bandwidth. And illegal persons do not need to use the common power line carrier communication mode but select other communication modes. Frequency hopping communication techniques, as are commonly used in broadband carrier communications today, are not easily detectable. These factors will affect the blocking of carrier communications and affect the security of the information devices and information systems.
In addition, in terms of interference measures, white noise interference can be theoretically and actually eliminated by a technical decryption method to restore original information; a single-frequency signal with strong regularity generated by a Voltage Controlled Oscillator (VCO) is used as an interference information source, the signal source has larger loopholes, and a carrier signal can pass through a crack due to a certain gap between the signals, so that the interference is avoided for normal communication; the frequency division detection and interference method is not applicable to the time division multiplex communication by using only one frequency; and, handling the transition type and short circuit/bypass type problems or more with the input signal, etc. Therefore, the technology still has large security holes and hidden danger of secret leakage.
Disclosure of Invention
The invention aims to overcome the technical problems in the prior art and provides a dynamic blocking device and a dynamic blocking method for monitoring the carrier communication of a scrambling code injection type power line, which can start an interference information source to implement the whole scrambling code injection type interference with full frequency domain, no leakage and high safety on the carrier communication frequency band of the power line when a suspected carrier signal or other electromagnetic signals are monitored on the power line, and block possible carrier communication; the power line can be effectively protected safely, the influence on the electromagnetic environment of the power line can be reduced to the maximum extent, and the intelligent application of power line carrier communication blocking is well realized.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a dynamic blocking device for monitoring carrier communication of a scrambling code injection type power line is characterized in that: the system comprises a power line signal monitoring unit, a processing unit, a control logic unit, a frequency conversion scrambling code generator, a dynamic initial value resetting scrambling code generator, a natural noise signal generator, a first pre-nonlinear amplifying unit, a second mixed pre-nonlinear amplifying unit, a first broadband power push-pull amplifier, a second broadband power push-pull amplifier, a first coupler and a second coupler, wherein the power line signal monitoring unit and the control logic unit are connected with the processing unit, the control logic unit is respectively connected with the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator, the frequency conversion scrambling code generator, the first pre-nonlinear amplifying unit, the first broadband power push-pull amplifier and the first coupler are sequentially connected, and the dynamic initial value resetting scrambling code generator and the natural noise signal generator are connected with the second mixed pre-nonlinear amplifying unit, the second mixed pre-nonlinear amplification unit, the second broadband power push-pull amplifier and the second coupler are sequentially connected.
The power line signal monitoring unit comprises a radio frequency signal coupling unit, a band-pass filter, a broadband signal processing unit, a signal amplifier and a carrier monitor which are sequentially connected, and is connected with the processing unit through the carrier monitor.
And a threshold adjusting circuit is arranged between the carrier monitor and the processing unit.
The power line signal monitoring unit, the processing unit, the control logic unit, the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator, the natural noise signal generator, the first pre-nonlinear amplifying unit, the second mixed pre-nonlinear amplifying unit, the first broadband power push-pull amplifier, the second broadband power push-pull amplifier, the first coupler and the second coupler are all arranged on the same circuit board.
The monitoring dynamic blocking device also comprises a shell, a power supply module is arranged in the shell, a power socket, a power switch, a power indicator lamp and a blocking indicator lamp which are all connected with the power supply module are arranged on the shell, a power line signal monitoring unit, a processing unit, a control logic unit, a frequency conversion scrambling code generator, a dynamic initial value resetting scrambling code generator, a natural noise signal generator, a first preposed nonlinear amplifying unit, a second mixed preposed nonlinear amplifying unit, a first broadband power push-pull amplifier, a second broadband power amplifier, a first coupler and a second coupler are all arranged in the shell, and the power line signal monitoring unit, the processing unit, the control logic unit, the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator, the natural noise signal generator, the first preposed nonlinear amplifying unit, the second mixed preposed nonlinear amplifying unit, the frequency conversion scrambling code generator, the natural noise signal generator, the first preposed nonlinear amplifying, The first broadband power push-pull amplifier, the second broadband power push-pull amplifier, the first coupler and the second coupler are all powered by the power supply module.
A monitoring dynamic blocking method for power line carrier communication is characterized by comprising the following steps:
the method comprises the following steps: the carrier communication signals of the power line are obtained in real time by using a radio frequency signal coupling unit, filtering processing, cascade amplification, logarithmic detection processing and signal amplification processing are sequentially carried out on the carrier communication signals by respectively adopting a band-pass filter, a broadband signal processing unit and a signal amplifier, then a carrier monitor is used for monitoring whether suspicious carrier signals or other electromagnetic signals exist in the amplified carrier communication signals, and if yes, the step II is carried out;
step two: the processing unit controls the variable frequency scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator through the control logic unit to respectively generate an irregular first scrambling code information flow, a dynamically changed second scrambling code information flow and a disordered true noise information flow, the first scrambling code information flow is used as a first path of scrambling code signal, and the second scrambling code information flow and the true noise information flow are mixed to be used as a second path of scrambling code signal;
step three: controlling a first pre-nonlinear amplification unit to amplify the first path of scrambling code signal, generating a harmonic signal to disturb the first path of scrambling code signal, and expanding the bandwidth of the disturbed first path of scrambling code signal; controlling a second mixed pre-nonlinear amplification unit to amplify the second path of scrambling code signals, generating harmonic signals to disturb the second path of scrambling code signals, and expanding the bandwidth of the disturbed second path of scrambling code signals;
step four: and respectively performing power amplification processing on the first path of scrambling code signal and the second path of scrambling code signal by using a first broadband power push-pull amplifier and a second broadband power push-pull amplifier, and respectively injecting the first path of scrambling code signal and the second path of scrambling code signal after power amplification onto a power line by using a first coupler and a second coupler to block carrier communication by using the power line.
In the monitoring dynamic blocking method, the blocking time is 2-5 minutes each time.
The invention has the advantages that:
1. the invention can start the interference information source to implement the whole interference of the scrambling code injection type with full frequency domain, no leakage and high safety on the carrier communication frequency band of the power line when the suspected carrier signal or other electromagnetic signals are monitored on the power line, and block possible carrier communication; the power line can be effectively protected safely, the influence on the electromagnetic environment of the power line can be reduced to the maximum extent, and the intelligent application of power line carrier communication blocking is well realized.
2. The invention combines the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator into the scrambling code signal, can directly superpose the scrambling code signal and all carrier signals on the power line, thoroughly disturbs the inherent characteristics of the carrier signals, prevents the carrier signals from being received, identified and demodulated by a technical method, blocks the carrier communication of the power line and achieves the aim of protecting the carrier communication safety of the power line. Importantly, the mode of blocking power line carrier communication is irrelevant to the use power of equipment, can adapt to the application of various scenes, and solves the safety protection problems of large-scale equipment, a complex information system, a local safety area and an important power line node. Meanwhile, the protection bandwidth can be doubled in the prior art, and the protection capability of power line carrier communication is improved.
3. The invention mainly generates an effective ultra-wideband scrambling code information source for blocking the power line carrier communication, and the effective ultra-wideband scrambling code information source is coupled and injected onto a power line after being amplified by broadband power. The quality of the interference information source is the key of safety protection, and is the important factor of the safety protection effect. Therefore, in order to increase reliability and anti-reduction capability, a digital technology is adopted to generate two paths of scramblers with different properties, and natural noise formed by circuit devices is fused, processed and superposed to serve as an ultra-wideband interference information source, so that the anti-receiving, demodulation and information reduction capabilities are greatly improved. The scrambling code information source is amplified by adopting a separating element, rich harmonic signals are generated by preposing nonlinear amplification, the signal bandwidth of the scrambling code information source is expanded, broadband power amplification is carried out through a push-pull circuit, the signal is output to a coupler and injected onto a power line, multiple interference on carrier signals is realized, and the effectiveness of blocking carrier communication and other information transmission is ensured.
4. The invention adopts the frequency conversion scrambling code generator, the dynamic initial value reset scrambling code generator, the natural noise signal generator technology and the interference signal nonlinear amplification technology, so that the scrambling code information source is extremely complex, and meanwhile, the technology which can not be used in communication, encryption and decryption is also adopted, and the safety is extremely high. So that no one or organization can obtain useful information from power line carrier communication in the guard band range.
5. The invention adopts multiple high-strength scrambling code generation technology and power line ultra-wideband signal injection technology to block information, can realize seamless and uninterrupted full coverage on the bandwidth larger than 100MHz, and has larger protective frequency bandwidth and wider application range; the method can be applied to various large-scale equipment, systems and areas needing protection without limitation, and the number of protection equipment is greatly reduced besides the application range is enlarged. And based on power line carrier monitoring technologies such as ultra wide band RF signal receiving, analyzing and processing technologies, signal monitoring technologies, process control and the like, dynamic intelligent blocking of power line carrier communication is achieved, and influences on the power line electromagnetic environment are greatly reduced.
6. The invention adopts the radio frequency signal coupling unit to sense abnormal signals on the power line in time, and provides powerful guarantee for subsequent emergency blocking treatment. The nonlinear preamplifier is adopted to well expand the bandwidth of the scrambling code information source, the scrambling code information source is further disturbed, and a solid foundation is laid for the suppression and the anti-reduction of the power line carrier communication full-frequency-domain signal.
7. The invention realizes that the scrambling codes wholly and seamlessly cover the possible area of power line carrier communication, creatively opens up a new path for blocking the power line carrier communication.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic structural diagram of the housing of the present invention.
Detailed Description
The invention provides a scrambling code injection type power line carrier communication monitoring dynamic blocking device which comprises a power line signal monitoring unit, a processing unit, a control logic unit, a frequency conversion scrambling code generator, a dynamic initial value resetting scrambling code generator, a natural noise signal generator, a first front nonlinear amplification unit, a second mixed front nonlinear amplification unit, a first broadband power push-pull amplifier, a second broadband power push-pull amplifier, a first coupler and a second coupler, wherein the power line signal monitoring unit and the control logic unit are connected with the processing unit, the control logic unit is respectively connected with the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator, the frequency conversion scrambling code generator, the first front nonlinear amplification unit, the first broadband power push-pull amplifier and the first coupler are sequentially connected, the dynamic initial value resetting scrambling code generator and the natural noise signal generator are both connected with a second mixed pre-nonlinear amplification unit, and the second mixed pre-nonlinear amplification unit, the second broadband power push-pull amplifier and the second coupler are sequentially connected.
Specifically, the functional effects of each component are as follows:
the power line signal monitoring unit is used for monitoring power line carrier signals and sending instructions to the processing unit when suspicious carrier signals or other electromagnetic signals are monitored.
And after receiving the instruction, the processing unit starts the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator through the control logic unit to output the scrambling code information source.
The frequency conversion scrambling code generator is used for generating an irregular first scrambling code information flow.
The dynamic initial value resetting scrambling code generator is used for generating a second scrambling code information flow which changes dynamically.
The natural noise signal generator is used for generating a cluttered true noise information stream.
The first pre-nonlinear amplifying unit is used for amplifying an information flow signal (a first scrambling information flow signal), generating a harmonic signal to further disturb the information flow signal, and expanding the bandwidth of the information flow signal.
The second mixing pre-nonlinear amplifying unit is used for mixing and amplifying the second scrambling code information flow and the true noise information flow, generating a harmonic signal to further disturb the mixed information flow signal and expand the bandwidth of the mixed information flow signal.
The first broadband power push-pull amplifier and the second broadband power push-pull amplifier are used for performing power amplification processing on scrambling signals.
The first coupler and the second coupler are used for injecting the scrambling code signals after power amplification to a power line.
Preferably, the power line signal monitoring unit comprises a radio frequency signal coupling unit, a band-pass filter, a broadband signal processing unit, a signal amplifier and a carrier monitor which are connected in sequence, and the power line signal monitoring unit is connected with the processing unit through the carrier monitor.
Further, a threshold adjusting circuit is arranged between the carrier monitor and the processing unit.
Preferably, the power line signal monitoring unit, the processing unit, the control logic unit, the variable frequency scrambling code generator, the dynamic initial value resetting scrambling code generator, the natural noise signal generator, the first pre-nonlinear amplifying unit, the second mixed pre-nonlinear amplifying unit, the first broadband power push-pull amplifier, the second broadband power push-pull amplifier, the first coupler and the second coupler are all arranged on the same circuit board.
Preferably, the monitoring dynamic blocking device further comprises a housing, a power supply module is arranged in the housing, a power socket, a power switch, a power indicator and a blocking indicator which are all connected with the power supply module are arranged on the housing, a power line signal monitoring unit, a processing unit, a control logic unit, a frequency conversion scrambling code generator, a dynamic initial value resetting scrambling code generator, a natural noise signal generator, a first pre-nonlinear amplifying unit, a second hybrid pre-nonlinear amplifying unit, a first broadband power push-pull amplifier, a second broadband power push-pull amplifier, a first coupler and a second coupler are all arranged in the housing, and the power line signal monitoring unit, the processing unit, the control logic unit, the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator, the natural noise signal generator, the first pre-nonlinear amplifying unit, the second hybrid pre-nonlinear amplifying unit, the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator, the natural noise, The first broadband power push-pull amplifier, the second broadband power push-pull amplifier, the first coupler and the second coupler are all powered by the power supply module.
The invention also provides a dynamic blocking method for monitoring power line carrier communication, which comprises the following steps:
the method comprises the following steps: the carrier communication signals of the power line are obtained in real time by using a radio frequency signal coupling unit, filtering processing, cascade amplification, logarithmic detection processing and signal amplification processing are sequentially carried out on the carrier communication signals by respectively adopting a band-pass filter, a broadband signal processing unit and a signal amplifier, then a carrier monitor is used for monitoring whether suspicious carrier signals or other electromagnetic signals exist in the amplified carrier communication signals, and if yes, the step II is carried out; if not, the monitoring process is continuously carried out, and the response speed of monitoring is in the US level.
Step two: the processing unit controls the variable frequency scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator through the control logic unit to respectively generate an irregular first scrambling code information flow, a dynamically changed second scrambling code information flow and a disordered true noise information flow, the first scrambling code information flow is used as a first path of scrambling code signal, and the second scrambling code information flow and the true noise information flow are mixed to be used as a second path of scrambling code signal.
Step three: controlling a first pre-nonlinear amplification unit to amplify the first path of scrambling code signal, generating a harmonic signal to disturb the first path of scrambling code signal, and expanding the bandwidth of the disturbed first path of scrambling code signal; and controlling a second mixed pre-nonlinear amplification unit to amplify the second path of scrambling code signals, generating harmonic signals to disturb the second path of scrambling code signals, and expanding the bandwidth of the disturbed second path of scrambling code signals.
Step four: and (3) respectively carrying out power amplification processing on the first path of scrambling code signal and the second path of scrambling code signal obtained in the third step by using a first broadband power push-pull amplifier and a second broadband power push-pull amplifier, and respectively injecting the first path of scrambling code signal and the second path of scrambling code signal after power amplification onto a power supply line by using a first coupler and a second coupler to block carrier communication by using the power supply line.
Furthermore, in the dynamic blocking method for monitoring of the invention, when suspicious carrier signals or other electromagnetic signals are monitored each time, the blocking time is 2-5 minutes, and the monitoring process is rapidly started again (in a monitoring mode at a speed of the US level) after the blocking process is finished, and the process is circulated, so that the purpose of effective protection is achieved.
The respective compositions in the present invention will be specifically described below.
The radio frequency signal coupling unit extracts suspicious carrier signals or other electromagnetic signals on a power line by adopting devices such as a common mode inductor, a bidirectional Transient Voltage Suppressor (TVS), a piezoresistor (RV) and the like, and the suspicious carrier signals or other electromagnetic signals are processed by a band-pass filter and then sent to the broadband signal processing unit for signal receiving, analysis and processing so as to monitor the possible power line carrier signals.
The band-pass filter adopts a passive LC band-pass filter, and filters interference or clutter signals outside a frequency band used by power line carrier communication so as to analyze and process carrier communication signals in the following process.
The broadband signal processing unit adopts an AD8513 signal processor to carry out cascade amplification and logarithmic detection processing on the coupled broadband RF signal, outputs a level signal after processing, and monitors a carrier communication signal possibly existing on a power line and other electromagnetic signals possibly existing. The broadband signal processing unit adopts a progressive compression integration technology and a logarithmic detection algorithm on a cascade amplifier chain, receives and processes the signals integrally in a higher broadband, and has extremely high response time (us level) and monitoring speed. And has high stability, and is particularly suitable for monitoring burst signals.
The carrier monitor compares, analyzes and processes the amplitude of the monitoring signal generated by the broadband signal processing unit and the set emergency processing threshold, when the amplitude of the suspicious carrier signal or other electromagnetic signals is higher than the set limit value, an emergency blocking request is generated and processed by the processing unit, and the blocking of the carrier communication of the power line is realized.
The processing unit has the functions of monitoring processing, function control and time slot allocation, adopts an STM32F407 processor taking an ARM 32-bit Cortex-M4 as an inner core, and comprises application functions of a DSP (signal processor), an A/D, D/A and the like. The main task is to perform corresponding analysis processing according to the power line monitoring result, control and complete monitoring and blocking to be performed repeatedly and to reasonably, effectively and safely distribute monitoring and blocking time slots. The method can monitor suspicious carrier signals or other electromagnetic signals in time, can quickly block the signals, and reduces the influence on the electromagnetic environment under the condition of ensuring the information security.
The control logic unit adopts a digital circuit combination, and under the control of the monitoring processing unit, the function control unit and the time slot allocation processing unit, the control logic unit timely controls and generates three paths of scrambling code information sources and starts an injection type blocking process.
The frequency conversion scrambling code generator adopts a digital circuit technology method, and is realized by using a 74S595 serial-in parallel-out shift register to output an exclusive OR according to a certain algorithm in multiple bits and then serially connecting in a shift register and a related logic device to form an anti-return-to-zero circuit. 256 clock frequency conversion technologies which can be changed out of order are adopted to thoroughly disturb the regularity of scrambling code generation, so that the generated first scrambling code information flow can not be eliminated, and the purpose of safety protection of power line carrier communication is achieved.
The random number dynamic initial value resetting scrambling code generator adopts a plurality of pieces of 74S194 merged into and out of the shift register to output exclusive OR according to a certain algorithm, then the shift register is connected with random numbers which are shifted and dynamic irregular in series to reset the initial value of the shift, and the multi-stage cascade realization is carried out. The random number can reach more than ten thousand, the rule of scrambling code generation is thoroughly disturbed, and the multistage cascade is added, so that the generated second scrambling code information flow can reach the ground step that can not be eliminated, and the safety is very high.
The natural noise signal generator utilizes the physical characteristics of the triode in the digital circuit, and can generate natural true noise information flow under special design conditions, and the true noise information flow is completely disordered noise without any rule, cannot be eliminated from signals, and is an ideal disturbing tool.
The nonlinear amplifier generates rich harmonic waves by utilizing a nonlinear amplification mechanism, further scrambles a scrambling code information source, expands the bandwidth of a scrambling code signal, further improves the safety intensity of the scrambling code information source and strengthens the blocking capability of power line carrier communication.
The broadband power push-pull amplifier is composed of multiple stages of PNP and NPN pair transistors, has lower output impedance and higher output power, and is an ideal broadband power amplifier for driving the coupler.
The coupler adopts main devices such as a common-mode inductor, a bidirectional Transient Voltage Suppressor (TVS), a piezoresistor (RV) and the like to form a coupling assembly similar to a transformer, a scrambling code information source after power amplification is injected onto a power line and is superposed with a possible power line carrier communication signal to completely disturb the carrier communication signal, so that the power line carrier signal cannot be received, demodulated and restored to obtain useful information, the power line carrier communication is blocked, and the information safety of important information equipment, systems and networks is ensured.
The invention can determine whether to start safety protection according to the monitoring result of power line carrier communication, namely when the existence of suspicious carrier signals or other electromagnetic signals on the power line is monitored, signal blocking is started; when the existence of suspicious carrier signals or other electromagnetic signals is not monitored, real-time monitoring is continuously carried out, communication blocking is not started, and unnecessary electromagnetic pollution on a power line is reduced. Simply speaking, the power line carrier monitoring function and the power line carrier communication blocking function are tightly combined together to form a linkage mechanism, and purposeful communication blocking is realized. The working mode is that only the monitoring function is started under normal conditions, and when a carrier signal is monitored to exist on the power line, signal blocking is started. Blocking the communication for 2-5 minutes, then automatically stopping blocking, rapidly entering a monitoring mode again (US level), and starting blocking again if suspicious carrier signals or other electromagnetic signals are monitored again; and if the suspicious carrier signal or other electromagnetic signals are not monitored, continuously carrying out real-time monitoring. The process is repeated repeatedly and continuously, and intelligent protection on power line carrier communication is adaptively implemented.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (7)
1. A dynamic blocking device for monitoring carrier communication of a scrambling code injection type power line is characterized in that: the system comprises a power line signal monitoring unit, a processing unit, a control logic unit, a frequency conversion scrambling code generator, a dynamic initial value resetting scrambling code generator, a natural noise signal generator, a first pre-nonlinear amplifying unit, a second mixed pre-nonlinear amplifying unit, a first broadband power push-pull amplifier, a second broadband power push-pull amplifier, a first coupler and a second coupler, wherein the power line signal monitoring unit and the control logic unit are connected with the processing unit, the control logic unit is respectively connected with the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator, the frequency conversion scrambling code generator, the first pre-nonlinear amplifying unit, the first broadband power push-pull amplifier and the first coupler are sequentially connected, and the dynamic initial value resetting scrambling code generator and the natural noise signal generator are connected with the second mixed pre-nonlinear amplifying unit, the second mixed pre-nonlinear amplification unit, the second broadband power push-pull amplifier and the second coupler are sequentially connected.
2. The dynamic blocking device for monitoring the scrambling code injection type power line carrier communication according to claim 1, wherein: the power line signal monitoring unit comprises a radio frequency signal coupling unit, a band-pass filter, a broadband signal processing unit, a signal amplifier and a carrier monitor which are sequentially connected, and is connected with the processing unit through the carrier monitor.
3. The dynamic blocking device for monitoring the scrambling code injection type power line carrier communication according to claim 2, wherein: and a threshold adjusting circuit is arranged between the carrier monitor and the processing unit.
4. A scrambling code injection power line carrier communication monitoring dynamic blocking device according to any one of claims 1-3, characterized in that: the power line signal monitoring unit, the processing unit, the control logic unit, the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator, the natural noise signal generator, the first pre-nonlinear amplifying unit, the second mixed pre-nonlinear amplifying unit, the first broadband power push-pull amplifier, the second broadband power push-pull amplifier, the first coupler and the second coupler are all arranged on the same circuit board.
5. A scrambling code injection power line carrier communication monitoring dynamic blocking device according to any one of claims 1-3, characterized in that: the monitoring dynamic blocking device also comprises a shell, a power supply module is arranged in the shell, a power socket, a power switch, a power indicator lamp and a blocking indicator lamp which are all connected with the power supply module are arranged on the shell, a power line signal monitoring unit, a processing unit, a control logic unit, a frequency conversion scrambling code generator, a dynamic initial value resetting scrambling code generator, a natural noise signal generator, a first preposed nonlinear amplifying unit, a second mixed preposed nonlinear amplifying unit, a first broadband power push-pull amplifier, a second broadband power amplifier, a first coupler and a second coupler are all arranged in the shell, and the power line signal monitoring unit, the processing unit, the control logic unit, the frequency conversion scrambling code generator, the dynamic initial value resetting scrambling code generator, the natural noise signal generator, the first preposed nonlinear amplifying unit, the second mixed preposed nonlinear amplifying unit, the frequency conversion scrambling code generator, the natural noise signal generator, the first preposed nonlinear amplifying, The first broadband power push-pull amplifier, the second broadband power push-pull amplifier, the first coupler and the second coupler are all powered by the power supply module.
6. A monitoring dynamic blocking method for power line carrier communication is characterized by comprising the following steps:
the method comprises the following steps: the carrier communication signals of the power line are obtained in real time by using a radio frequency signal coupling unit, filtering processing, cascade amplification, logarithmic detection processing and signal amplification processing are sequentially carried out on the carrier communication signals by respectively adopting a band-pass filter, a broadband signal processing unit and a signal amplifier, then a carrier monitor is used for monitoring whether suspicious carrier signals or other electromagnetic signals exist in the amplified carrier communication signals, and if yes, the step II is carried out;
step two: the processing unit controls the variable frequency scrambling code generator, the dynamic initial value resetting scrambling code generator and the natural noise signal generator through the control logic unit to respectively generate an irregular first scrambling code information flow, a dynamically changed second scrambling code information flow and a disordered true noise information flow, the first scrambling code information flow is used as a first path of scrambling code signal, and the second scrambling code information flow and the true noise information flow are mixed to be used as a second path of scrambling code signal;
step three: controlling a first pre-nonlinear amplification unit to amplify the first path of scrambling code signal, generating a harmonic signal to disturb the first path of scrambling code signal, and expanding the bandwidth of the disturbed first path of scrambling code signal; controlling a second mixed pre-nonlinear amplification unit to amplify the second path of scrambling code signals, generating harmonic signals to disturb the second path of scrambling code signals, and expanding the bandwidth of the disturbed second path of scrambling code signals;
step four: and respectively performing power amplification processing on the first path of scrambling code signal and the second path of scrambling code signal by using a first broadband power push-pull amplifier and a second broadband power push-pull amplifier, and respectively injecting the first path of scrambling code signal and the second path of scrambling code signal after power amplification onto a power line by using a first coupler and a second coupler to block carrier communication by using the power line.
7. The method for monitoring dynamic blocking of power line carrier communication according to claim 6, wherein: in the monitoring dynamic blocking method, the blocking time is 2-5 minutes each time.
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