Regional electromagnetic signal protection system

Abstract

The invention discloses a regional electromagnetic signal protection system. The system comprises a related processing module; the interference information source module is composed of multiple paths of interference signal generating units, and each path of interference signal generating unit generates interference signals of different frequency bands; wherein the partial interference signal generation unit is used for generating an M-sequence pseudo-random total correlation interference signal according to the clock signal; a broadband power amplifier module; an omnidirectional antenna module; the system control module is used for controlling the interference information source module and the broadband power amplifier module; and the power supply module supplies power to the system control module, the interference information source module, the broadband power amplifier module and the related processing module. The multi-channel interference signal generation unit and multi-channel parallel processing are arranged and are responsible for generating wide-frequency-band interference signals, so that safety protection of confidential information of various screen display systems is achieved, and the protection requirements of electromagnetic signals of different frequency bands are met.

Description

Technical Field

[0001] The present application relates to the field of signal protection technology, and in particular to a regional electromagnetic signal protection system. Background Art

[0002] With the rapid development of information technology, large-screen display systems such as LCD, LED, and projectors have been widely used in confidential places. However, these display systems generate electromagnetic radiation during operation, which may be received remotely by criminals using specific equipment to restore the displayed confidential information, thus causing information security risks.

[0003] For example, a video information electromagnetic leakage interference method, terminal device and storage medium with China Authorization Publication No. CN109495204B discloses an interference method for video information electromagnetic leakage;

[0004] However, most of the existing electromagnetic signal protection measures have limited protection frequency bands, resulting in unsatisfactory protection effects. Therefore, there is an urgent need for a regional electromagnetic signal protection system that can cover a wide frequency band and has good protection effects. Summary of the invention

[0005] To this end, the present application provides a regional electromagnetic signal protection system to solve the problem that most of the protection means in the prior art have limited protection frequency bands, resulting in unsatisfactory protection effects.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A regional electromagnetic signal protection system, comprising:

[0008] The relevant processing module includes a digital video clock extraction unit, which is provided with an HDMI video signal demodulation and clock extraction circuit, and is used to access the digital video signal with the same video content as that played in the confidential place, separate and extract the clock signal in the digital video signal, and send the obtained clock signal to the system control module;

[0009] The interference signal source module is composed of multiple interference signal generating units, each of which generates interference signals of different frequency bands; wherein some interference signal generating units are used to generate M-sequence pseudo-random fully correlated interference signals according to the clock signal;

[0010] The broadband power amplifier module is composed of a multi-channel broadband power amplifier; the multi-channel broadband power amplifier is connected to the multi-channel interference signal generating unit in a one-to-one correspondence, and is used to complete the amplification and power output of the interference signal of the corresponding frequency band, and the output amplified signal is transmitted to the omnidirectional antenna module;

[0011] The omnidirectional antenna module is composed of multiple broadband omnidirectional antennas, which correspond to the multiple interference signal generating units one by one and are responsible for transmitting the interference signal into space to achieve omnidirectional coverage;

[0012] System control module, used to control the interference source module and broadband power amplifier module, monitor the change of power output, and give an alarm when a fault occurs;

[0013] The power supply module supplies power to the system control module, the interference signal source module, the broadband power amplifier module and the related processing modules.

[0014] Optionally, the system control module also has built-in software algorithms, including: PID control algorithm, adaptive control algorithm and monitoring algorithm.

[0015] Optionally, the interference source unit is composed of 9 interference signal generating units, of which 3 generate M-sequence pseudo-random fully correlated interference signals and 1MHz-1200MHz frequency band interference signals;

[0016] The remaining 6 channels generate VCO voltage-controlled oscillator swept frequency interference signals, generating interference signals in the 1200MHz-6000MHz frequency band.

[0017] Optionally, the signal frequency bands of the 9 interference signal generating units are respectively: 1-400MHz, 400-700MHz, 700-1200MHz, 1200-1800MHz, 1800-2500MHz, 2500-3200MHz, 3200-3800MHz, 3800-4800MHz, and 4800-6000MHz.

[0018] Optionally, the emission intensity of the interference signal generating unit is 60-97 dBuv / m, the action direction is omnidirectional, the sweep frequency period is ≥10KHz, and the protection radius is ≥6M.

[0019] Optionally, the broadband power amplifier module workflow includes:

[0020] S1: receiving a signal from an interference signal generating unit;

[0021] S2: The received signal is then fed into a broadband power amplifier for amplification;

[0022] S3: The amplified signal is transmitted to the omnidirectional antenna module through the output port of the broadband power amplifier module.

[0023] Optionally, the broadband power amplifier module also has power control and protection functions.

[0024] Optionally, among the multiple broadband omnidirectional antennas, one is a 315 / 433M antenna, and the rest are 4G broadband antennas with the same performance.

[0025] Optionally, the workflow of the digital clock extraction unit includes:

[0026] S1: Demodulate the input digital video signal, separate the clock signal, and determine the synchronization and refresh rate of the signal;

[0027] S2: The extracted clock signal is amplified, filtered, and shaped;

[0028] S3: Use the processed clock signal to send to the relevant processing unit.

[0029] Optionally, one side of the digital video clock extraction unit is configured with a digital video input interface for directly plugging into the HDMI output port of the computer host where the video source is located, and the other side of the digital video clock extraction unit is respectively configured with a digital video output interface and a clock output socket, wherein the digital video output interface is used to connect to the HDMI input port of the display screen, and the clock output socket is used to output the clock signal, and the clock output socket is connected to the digital video clock input end of the system control module via a clock signal line.

[0030] Compared with the prior art, this application has at least the following beneficial effects:

[0031] 1. By setting up multiple interference signal generating units and multi-channel parallel processing, it is responsible for generating wide-band interference signals to achieve security protection of confidential information of various screen display systems and meet the protection needs of electromagnetic signals in different frequency bands.

[0032] 2. Multiple broadband omnidirectional antennas work together to ensure that interference signals in the entire frequency band can be effectively transmitted and covered. Through reasonable antenna layout and power allocation, a more uniform and stable interference effect can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0034] Figure 1 A module connection diagram of a regional electromagnetic signal protection system provided for one embodiment of the present application.

[0035] Figure 2 A structural schematic diagram of a digital video clock extraction unit of a regional electromagnetic signal protection system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0036] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0037] See also Figure 1 to Figure 2 , a regional electromagnetic signal protection system in one embodiment of the present invention includes a system control module, an interference source module, a broadband power amplifier module, an omnidirectional antenna module, a related processing module and a power supply module;

[0038] The system control module includes a single-chip microcomputer and a control circuit. The single-chip microcomputer is connected to the control circuit to complete the control of multi-channel interference signal sources and power amplification, and monitor the change of power output. The single-chip microcomputer receives and processes signals from other modules, and sends control signals according to preset program instructions. The control circuit is connected to the interference signal source module to control the sending of interference signals, and the control circuit is also connected to the broadband power amplifier module to control the signal power amplification output to the omnidirectional antenna module. The control circuit also monitors the change of signal power output and alarms when a fault occurs;

[0039] The system control module also has a built-in software algorithm, which uses a PID control algorithm to control the intensity, frequency and other parameters of the interference signal to achieve effective interference with electromagnetic radiation, and combines an adaptive control algorithm to monitor changes in the electromagnetic environment in real time and automatically adjust the parameters of the interference signal to cope with different electromagnetic interference scenarios. At the same time, a monitoring algorithm is used to monitor the intensity, frequency and other parameters of electromagnetic radiation to determine whether there is potential electromagnetic interference, as well as the operating status of the monitoring system, to promptly discover and handle potential faults, and to ensure the stability and reliability of the system;

[0040] The system control module can manage multiple interference signal generating units at the same time, ensuring that each interference signal can be output according to the predetermined frequency, strength and modulation method. This multi-channel parallel processing capability enables the equipment to cover a wider frequency band and provide more comprehensive electromagnetic interference protection.

[0041] The interference source module is composed of 9 interference signal generating units. Each interference signal generating unit generates interference signals of different frequency bands and is responsible for generating wide-band interference signals to achieve security protection of confidential information of various screen display systems. For example, some interference signal generating units generate M-sequence pseudo-random fully correlated interference signals. M-sequence pseudo-random signals are generated through a specific algorithm and modulated to generate fully correlated interference signals. This interference signal can be highly correlated with the target signal in the time domain and frequency domain, thereby effectively destroying the reception and restoration of electromagnetic radiation information.

[0042] Other interference signal generating units generate low-frequency interference signals, such as the frequency band from 1MHz to 1200MHz. Low-frequency signals are widely present in the electromagnetic environment and are easy to be received and restored. Therefore, effective interference with low-frequency signals is an important means of protecting confidential information.

[0043] Specifically, 3 interference signal generating units generate M-sequence pseudo-random fully correlated interference signals and 1MHz-1200MHz frequency band interference signals; the remaining 6 interference signal generating units generate VCO voltage-controlled oscillator frequency sweep interference signals, responsible for generating 1200MHz-6000MHz frequency band interference signals. The interference generated by the interference signal generating units covers the following frequency bands: 1-400MHz, 400-700MHz, 700-1200MHz, 1200-1800MHz, 1800-2500MHz, 2500-3200MHz, 3200-3800MHz, 3800-4800MHz, 4800-6000MHz;

[0044]

[0045] The emission intensity of the interference signal generating unit is 60-97 dBuv / m, the action direction is omnidirectional, the sweep frequency period is ≥10KHz, and the protection radius is ≥6M.

[0046] Broadband power amplifier module: The broadband power amplifier unit is composed of multiple broadband power amplifiers, which completes the amplification and power output of the interference signal in the corresponding frequency band. It is responsible for amplifying and outputting the power of the interference signal, and the output amplified signal is transmitted to the omnidirectional antenna module to ensure that the interference signal can effectively cover the target area and achieve the expected protection effect;

[0047] The broadband power amplifier module also has power control and protection functions to prevent equipment damage caused by overcurrent, overvoltage, etc.

[0048] The broadband power amplifier module workflow includes:

[0049] S1: receiving a signal from an interference signal generating unit;

[0050] S2: The received signal is then fed into a broadband power amplifier for amplification; the broadband power amplifier has the ability to process wide-band signals, so it can cover the frequency band from 1MHz to 6000MHz. The amplification process involves adjusting the gain of the signal to ensure that the signal maintains sufficient strength during transmission;

[0051] S3: The amplified signal is output to the omnidirectional antenna module at a certain power level through the output port of the broadband power amplifier module.

[0052] The omnidirectional antenna module is responsible for effectively transmitting interference signals into space to achieve all-round coverage, thereby protecting confidential information from being remotely received and restored. It is composed of multiple broadband omnidirectional antennas. Omnidirectional antennas 1 to 9 correspond to 9 interference signal generating units. Each antenna corresponds to a specific frequency band. The antenna receives the signal from the broadband power amplifier module and converts it into electromagnetic wave form, ready to be transmitted into space.

[0053] The omnidirectional antenna evenly transmits electromagnetic waves to the surrounding space to achieve all-round coverage. The emitted electromagnetic waves interact with the electromagnetic field of the surrounding environment to form an interference barrier, destroying the technical conditions for long-distance reception and restoration of electromagnetic radiation information. At the same time, the system control module monitors the changes in power output in real time to ensure the stability and reliability of the interference signal.

[0054] Furthermore, the omnidirectional antennas include one 315 / 433M antenna, and the remaining eight are 4G broadband antennas with the same performance;

[0055] Specifically, multiple broadband omnidirectional antennas work together to ensure that interference signals within the entire frequency band can be effectively transmitted and covered. Through reasonable antenna layout and power allocation, a more uniform and stable interference effect can be achieved.

[0056] A related processing module, which includes a digital video clock extraction unit, having an HDMI video signal demodulation and clock extraction circuit, wherein the digital clock extraction unit demodulates the input digital video signal through a special circuit, thereby separating the clock signal therein to determine the synchronization and refresh rate of the signal, and the extracted clock signal undergoes steps such as signal amplification, filtering, and shaping to ensure its accuracy and stability. Using the processed clock signal, the related processing unit generates fully correlated and efficient interference signals, which are highly correlated with the clock signal of the original digital video signal in the frequency domain, thereby being able to more effectively destroy the reception and restoration of electromagnetic radiation information during the interference process, and finally, the formed fully correlated and efficient interference signal is output to the interference signal generation unit, amplified together with other interference signals, and transmitted through the omnidirectional antenna module;

[0057] like Figure 2 As shown, one side of the digital video clock extraction unit is configured with a digital video input interface for directly plugging into the HDMI output port of the computer host where the video source is located, and the other side of the digital video clock extraction unit is respectively configured with a digital video output interface and a clock output socket, wherein the digital video output interface is used to connect to the HDMI input port of the display screen, and the clock output socket is used to output a clock signal, and the clock output socket is connected to the digital video clock input end of the system control module through a clock signal line.

[0058] The power module is responsible for completing the conversion from AC to DC and providing 12V / 50W power guarantee.

[0059] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A regional electromagnetic signal protection system, characterized in that: include: The relevant processing module includes a digital video clock extraction unit, which is provided with an HDMI video signal demodulation and clock extraction circuit, and is used to access the digital video signal with the same video content as that played in the confidential place, separate and extract the clock signal in the digital video signal, and send the obtained clock signal to the system control module; The interference signal source module is composed of multiple interference signal generating units, each of which generates interference signals of different frequency bands; wherein some interference signal generating units are used to generate M-sequence pseudo-random fully correlated interference signals according to the clock signal; The broadband power amplifier module is composed of a multi-channel broadband power amplifier; the multi-channel broadband power amplifier is connected to the multi-channel interference signal generating unit in a one-to-one correspondence, and is used to complete the amplification and power output of the interference signal of the corresponding frequency band, and the output amplified signal is transmitted to the omnidirectional antenna module; The omnidirectional antenna module is composed of multiple broadband omnidirectional antennas, which correspond to the multiple interference signal generating units one by one and are responsible for transmitting the interference signal into space to achieve omnidirectional coverage; System control module, used to control the interference source module and broadband power amplifier module, monitor the change of power output, and give an alarm when a fault occurs; The power supply module supplies power to the system control module, the interference signal source module, the broadband power amplifier module and the related processing modules.

2. A regional electromagnetic signal protection system according to claim 1, characterized in that: The system control module also has built-in software algorithms, including: PID control algorithm, adaptive control algorithm and monitoring algorithm.

3. A regional electromagnetic signal protection system according to claim 1, characterized in that: The interference source unit is composed of 9 interference signal generating units, of which 3 generate M-sequence pseudo-random fully correlated interference signals and 1MHz-1200MHz frequency band interference signals; The remaining 6 channels generate VCO voltage-controlled oscillator swept frequency interference signals, generating interference signals in the 1200MHz-6000MHz frequency band.

4. A regional electromagnetic signal protection system according to claim 3, characterized in that: The signal frequency bands of the 9 interference signal generating units are respectively: 1-400MHz, 400-700MHz, 700-1200MHz, 1200-1800MHz, 1800-2500MHz, 2500-3200MHz, 3200-3800MHz, 3800-4800MHz, and 4800-6000MHz.

5. A regional electromagnetic signal protection system according to claim 4, characterized in that: The emission intensity of the interference signal generating unit is 60-97 dBuv / m, the action direction is omnidirectional, the sweep frequency period is ≥10KHz, and the protection radius is ≥6M.

6. A regional electromagnetic signal protection system according to claim 1, characterized in that: The broadband power amplifier module workflow includes: S1: receiving a signal from an interference signal generating unit; S2: The received signal is then fed into a broadband power amplifier for amplification; S3: The amplified signal is transmitted to the omnidirectional antenna module through the output port of the broadband power amplifier module.

7. The regional electromagnetic signal protection system according to claim 1, characterized in that: The broadband power amplifier module also has power control and protection functions.

8. The regional electromagnetic signal protection system according to claim 3, characterized in that: Among the multi-channel broadband omnidirectional antennas, one is a 315 / 433M antenna, and the others are 4G broadband antennas with the same performance.

9. The regional electromagnetic signal protection system according to claim 1, characterized in that: The workflow of the digital clock extraction unit includes: S1: Demodulate the input digital video signal, separate the clock signal, and determine the synchronization and refresh rate of the signal; S2: The extracted clock signal is amplified, filtered, and shaped; S3: Use the processed clock signal to send to the relevant processing unit.

10. The regional electromagnetic signal protection system according to claim 1, characterized in that: One side of the digital video clock extraction unit is configured with a digital video input interface for directly plugging into the HDMI output port of the computer host where the video source is located. The other side of the digital video clock extraction unit is respectively configured with a digital video output interface and a clock output socket, wherein the digital video output interface is used to connect to the HDMI input port of the display screen, and the clock output socket is used to output the clock signal, and the clock output socket is connected to the digital video clock input end of the system control module through a clock signal line.

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