Low-frequency detection blocking system

Abstract

The utility model relates to the technical field of communication, in particular to a low-frequency detection blocking system, which comprises a shielding system management and control platform, a low-frequency detection blocking device and a public network shielding device, the low-frequency detection blocking device comprises a plurality of low-frequency detection shielding units, and the public network shielding device comprises a near-end unit and a plurality of light expansion units. The shielding system management and control platform is electrically connected with the near-end unit and the plurality of low-frequency detection shielding units, the near-end unit is electrically connected with the plurality of light expansion units, each light expansion unit is electrically connected with the plurality of integrated optical fiber far-end units, each low-frequency detection shielding unit is electrically connected with a shielding antenna and an interception antenna, and the integrated optical fiber far-end units are electrically connected with the shielding antenna. The purpose of shielding low-frequency wireless communication signals can be achieved, the function of shielding the wireless communication signals in the whole network segment can be achieved, and the shielding device can protect various examination rooms, confidential conference rooms, troops and other confidential places.

Description

Technical Field

[0001] The utility model relates to the technical field of communications, in particular to a low-frequency detection and blocking system. Background Art

[0002] With the rapid development of mobile communication technology, mobile phones have brought convenience to people, but also brought many security risks. Currently, conventional signal shielding systems on the market are mainly aimed at shielding 2G, 3G, 4G, 5G and WIFI frequency bands. However, some radio transmission modules often use low-frequency communication modules that are not part of the public network band. As a result, we only focus on the public network band and ignore the low-frequency network band. Criminals also target this and often use low-frequency communication products to carry out criminal activities, such as detonating bombs, using various wireless data transmission modules to transmit answers for cheating during exams, and using micro walkie-talkies for illegal communication. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a low-frequency detection and blocking system, which can achieve the purpose of shielding low-frequency wireless communication signals, and further can realize the shielding function of wireless communication signals in the entire network segment.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A low-frequency detection and blocking system includes a shielding system management and control platform, a low-frequency detection and blocking device, and a public network shielding device. The low-frequency detection and blocking device includes a plurality of low-frequency detection and shielding units, and the public network shielding device includes a proximal unit and a plurality of optical extension units.

[0006] The shielding system control platform is electrically connected to the proximal unit and several low-frequency detection and shielding units respectively, the proximal unit is electrically connected to several optical extension units respectively, each of the optical extension units is electrically connected to several integrated optical fiber remote units, and each of the low-frequency detection and shielding units is electrically connected to a shielding antenna and a listening antenna.

[0007] Furthermore, the low-frequency detection shielding unit includes an FPGA chip and an AD / DA converter. The FPGA chip is electrically connected to the shielding system management and control platform and the AD / DA converter respectively. The analog-to-digital conversion end of the AD / DA converter is electrically connected to the listening antenna, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the shielding antenna.

[0008] Furthermore, the low-frequency detection shielding unit also includes a low-noise amplifier and a power amplifier. The analog-to-digital conversion end of the AD / DA converter is electrically connected to the listening antenna through the low-noise amplifier, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the shielding antenna through the power amplifier.

[0009] Furthermore, the low-frequency detection shielding unit also includes a first RF module and a second RF module, the analog-to-digital conversion end of the AD / DA converter is electrically connected to the low-noise amplifier through the first RF module, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the power amplifier through the second RF module.

[0010] Furthermore, a coupler is electrically connected between the proximal unit and the optical extension unit.

[0011] Furthermore, the number of the optical extension units is five, the number of the couplers is four, the four couplers are connected to each other in series, three of the five optical extension units are electrically connected to the proximal unit through a coupler respectively, and the remaining two of the five optical extension units are electrically connected to the proximal unit through the same coupler.

[0012] Furthermore, the proximal unit and the optical extension unit are connected via a feeder, the optical extension unit and the integrated optical fiber remote unit are connected via an optical fiber, the proximal unit and the shielding system management and control platform are connected via a network cable, the proximal unit and the low-frequency detection shielding unit are connected via a network cable, the low-frequency detection shielding unit and the shielding antenna are connected via a feeder, and the low-frequency detection shielding unit and the listening antenna are connected via a feeder.

[0013] Furthermore, the bandwidth range of the shielding antenna is 40M-700M, and the bandwidth range of the listening antenna is 40M-700M.

[0014] Furthermore, one optical extension unit is electrically connected to sixteen integrated optical fiber remote end units.

[0015] Furthermore, the shielding system control platform includes a management platform, a server and a switch. The server is electrically connected to the management platform and the switch respectively. The switch is electrically connected to the proximal unit and several low-frequency detection and shielding units respectively.

[0016] The beneficial effects of the present invention are:

[0017] This solution sets up a shielding system control platform, a low-frequency detection and blocking device and a public network shielding device. The low-frequency detection and blocking device includes several low-frequency detection and shielding units. The public network shielding device includes a proximal unit and several optical extension units. The low-frequency detection and shielding unit is used to collect the low-frequency signal of the air interface, analyze the characteristic value of the low-frequency signal of the air interface, output the frequency point of the low-frequency communication, and then automatically filter and process each frequency point in combination with the black and white list. For the low-frequency frequency point that needs to be blocked, an interference code is transmitted to block the mutual communication of the low-frequency modules; the listening antenna is used to receive the low-frequency signal of the air interface and transmit this low-frequency signal to the The signal is input to the low-frequency detection and shielding unit for signal reception and processing; the near-end unit is used to collect and analyze public network signals and generate interference codes; the optical extension unit is used to distribute the scrambling codes generated by the near-end unit to each integrated optical fiber remote unit; the integrated optical fiber remote unit is used to amplify and output the interference codes distributed by the optical extension unit to achieve the shielding function of public network mobile phone signals, thereby achieving the purpose of shielding low-frequency wireless communication signals, and then achieving the shielding function of wireless communication signals in the entire network segment, providing protection for various examination rooms, confidential meeting rooms, military units and other confidential places. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a connection block diagram of the low-frequency detection and blocking system of the utility model;

[0019] Figure 2 This is a block diagram of the connection between the low-frequency detection shielding unit and other components of the low-frequency detection and blocking system of the present invention;

[0020] Description of labels:

[0021] 1. Shielding system control platform; 11. Management platform; 12. Server; 13. Switch;

[0022] 2. Low-frequency detection and blocking device; 21. Low-frequency detection shielding unit; 211. FPGA chip; 212. AD / DA converter; 22. Shielding antenna; 23. Listening antenna;

[0023] 3. Public network shielding device; 31. Proximal unit; 32. Optical extension unit; 33. Integrated optical fiber remote unit; 34. Coupler. DETAILED DESCRIPTION

[0024] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0025] Please refer to Figure 1 , the technical solution adopted by this utility model is:

[0026] A low-frequency detection and blocking system includes a shielding system management and control platform, a low-frequency detection and blocking device, and a public network shielding device. The low-frequency detection and blocking device includes a plurality of low-frequency detection and shielding units, and the public network shielding device includes a proximal unit and a plurality of optical extension units.

[0027] The shielding system control platform is electrically connected to the proximal unit and several low-frequency detection and shielding units respectively, the proximal unit is electrically connected to several optical extension units respectively, each of the optical extension units is electrically connected to several integrated optical fiber remote units, and each of the low-frequency detection and shielding units is electrically connected to a shielding antenna and a listening antenna.

[0028] From the above description, it can be seen that the beneficial effects of the present invention are:

[0029] This solution sets up a shielding system control platform, a low-frequency detection and blocking device and a public network shielding device. The low-frequency detection and blocking device includes several low-frequency detection and shielding units. The public network shielding device includes a proximal unit and several optical extension units. The low-frequency detection and shielding unit is used to collect the low-frequency signal of the air interface, analyze the characteristic value of the low-frequency signal of the air interface, output the frequency point of the low-frequency communication, and then automatically filter and process each frequency point in combination with the black and white list. For the low-frequency frequency point that needs to be blocked, an interference code is transmitted to block the mutual communication of the low-frequency modules; the listening antenna is used to receive the low-frequency signal of the air interface and transmit this low-frequency signal to the The signal is input to the low-frequency detection and shielding unit for signal reception and processing; the near-end unit is used to collect and analyze public network signals and generate interference codes; the optical extension unit is used to distribute the scrambling codes generated by the near-end unit to each integrated optical fiber remote unit; the integrated optical fiber remote unit is used to amplify and output the interference codes distributed by the optical extension unit to achieve the shielding function of public network mobile phone signals, thereby achieving the purpose of shielding low-frequency wireless communication signals, and then achieving the shielding function of wireless communication signals in the entire network segment, providing protection for various examination rooms, confidential meeting rooms, military units and other confidential places.

[0030] Furthermore, the low-frequency detection shielding unit includes an FPGA chip and an AD / DA converter. The FPGA chip is electrically connected to the shielding system management and control platform and the AD / DA converter respectively. The analog-to-digital conversion end of the AD / DA converter is electrically connected to the listening antenna, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the shielding antenna.

[0031] Furthermore, the low-frequency detection shielding unit also includes a low-noise amplifier and a power amplifier. The analog-to-digital conversion end of the AD / DA converter is electrically connected to the listening antenna through the low-noise amplifier, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the shielding antenna through the power amplifier.

[0032] As can be seen from the above description, the low-noise amplifier performs low-noise amplification on the received low-frequency signal of the air interface to increase the dynamic range of the AD / DA converter to detect small signals; the power amplifier can amplify and output the interference source to achieve the purpose of blocking the low-frequency signal of the air interface.

[0033] Furthermore, the low-frequency detection shielding unit also includes a first RF module and a second RF module, the analog-to-digital conversion end of the AD / DA converter is electrically connected to the low-noise amplifier through the first RF module, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the power amplifier through the second RF module.

[0034] From the above description, it can be seen that through the listening antenna reception, the first RF module inputs, the AD / DA converter converts the analog signal to 0 frequency and converts it into a digital signal. The analog-to-digital conversion end of the AD / DA converter inputs the converted digital signal into the FPGA chip. The FPGA chip performs channel analysis and detects the frequency point. Finally, it generates a corresponding interference code based on the characteristics of the signal, and then modulates the interference code and outputs it to the digital-to-analog conversion end of the AD / DA converter. The digital-to-analog conversion end of the AD / DA converter converts it into an analog signal and outputs it to the second RF module. The second RF module is amplified through the power amplifier output and shielded, thereby achieving the purpose of shielding low-frequency wireless signals.

[0035] Furthermore, a coupler is electrically connected between the proximal unit and the optical extension unit.

[0036] Furthermore, the number of the optical extension units is five, the number of the couplers is four, the four couplers are connected to each other in series, three of the five optical extension units are electrically connected to the proximal unit through a coupler respectively, and the remaining two of the five optical extension units are electrically connected to the proximal unit through the same coupler.

[0037] Furthermore, the proximal unit and the optical extension unit are connected via a feeder, the optical extension unit and the integrated optical fiber remote unit are connected via an optical fiber, the proximal unit and the shielding system management and control platform are connected via a network cable, the proximal unit and the low-frequency detection shielding unit are connected via a network cable, the low-frequency detection shielding unit and the shielding antenna are connected via a feeder, and the low-frequency detection shielding unit and the listening antenna are connected via a feeder.

[0038] Furthermore, the bandwidth range of the shielding antenna is 40M-700M, and the bandwidth range of the listening antenna is 40M-700M.

[0039] Furthermore, one optical extension unit is electrically connected to sixteen integrated optical fiber remote end units.

[0040] Furthermore, the shielding system control platform includes a management platform, a server and a switch. The server is electrically connected to the management platform and the switch respectively. The switch is electrically connected to the proximal unit and several low-frequency detection and shielding units respectively.

[0041] From the above description, it can be seen that the management platform is responsible for managing, controlling, and detecting the functions of the entire shielding system. It can perform time strategy switching functions, local disconnection functions, real-time alarm display functions, and display the operating status of each device; the server and switch are used to connect the external public network and serve as a bridge with the devices on the local network, so that the external network can control and operate each device on the internal network.

[0042] Please refer to Figure 1 and Figure 2 As shown, the first embodiment of the present utility model is:

[0043] Please refer to Figure 1 A low-frequency detection and blocking system includes a shielding system control platform 1, a low-frequency detection and blocking device 2, and a public network shielding device 3. The low-frequency detection and blocking device 2 includes a plurality of low-frequency detection and shielding units 21. The public network shielding device 3 includes a proximal unit 31 (a signal acquisition and scrambling code generation unit) and a plurality of optical extension units 32 (a unit that converts electrical signals transmitted from the proximal unit into multiple optical signal outputs).

[0044] The shielding system control platform 1 is electrically connected to the proximal unit 31 and several low-frequency detection and shielding units 21 respectively. The proximal unit 31 is electrically connected to several optical extension units 32 respectively. Each of the optical extension units 32 is electrically connected to several integrated optical fiber remote units 33 (which converts the optical signal transmitted by the optical extension into an electrical signal and amplifies the output unit). Each of the low-frequency detection and shielding units 21 is electrically connected to a shielding antenna 22 and a listening antenna 23.

[0045] The proximal unit 31 , the optical extension unit 32 and the integrated optical fiber distal unit 33 are all commercially available components.

[0046] Please refer to Figure 2 The low-frequency detection shielding unit 21 includes an FPGA chip 211 and an AD / DA converter 212 (an integrated chip, model ECR8668, which integrates RF up and down conversion functions, as well as A / D analog-to-digital and D / A digital-to-analog conversion functions). The FPGA chip 211 is electrically connected to the shielding system control platform 1 and the AD / DA converter 212 respectively. The analog-to-digital conversion end of the AD / DA converter 212 is electrically connected to the listening antenna 23, and the digital-to-analog conversion end of the AD / DA converter 212 is electrically connected to the shielding antenna 22.

[0047] In this embodiment, the FPGA chip 211 adopts the chip model A7-75T of XILINX. This chip is a core chip for digital signal processing, which is mainly responsible for detecting and analyzing the low-frequency signal of the air interface. It traverses the entire bandwidth of the low-frequency signal of the air interface from 40M to 700M, records the detected frequency points, and compares them with the black and white list library to send out the scrambling code of the digital signal for shielding. The development principle starts from the baseband interference method and adopts different interference schemes to deal with the characteristics of different low-frequency communication standards to achieve the purpose of blocking mobile phone communication. Specifically, software radio technology and digital signal processing methods are used to analyze the special channels of each standard to obtain their coding and related information. The output blocking mechanism is highly efficient, which can make the shielding signal equivalent to the original field strength power, or greater than 3db to block the normal communication of the low-frequency wireless signal, thereby achieving the effect of signal blocking and shielding.

[0048] The low-frequency detection shielding unit 21 also includes a low-noise amplifier and a power amplifier. The analog-to-digital conversion end of the AD / DA converter 212 is electrically connected to the listening antenna 23 through the low-noise amplifier, and the digital-to-analog conversion end of the AD / DA converter 212 is electrically connected to the shielding antenna 22 through the power amplifier.

[0049] The low-frequency detection shielding unit 21 also includes a first RF module and a second RF module. The analog-to-digital conversion end of the AD / DA converter 212 is electrically connected to the low-noise amplifier through the first RF module, and the digital-to-analog conversion end of the AD / DA converter 212 is electrically connected to the power amplifier through the second RF module.

[0050] The low-frequency detection shielding unit 21 also includes a clock chip, which is electrically connected to the FPGA chip 211. The clock chip uses a TI chip model 7005. This model of clock chip can output multiple clocks with the same phase to meet the purpose of synchronization of different data streams.

[0051] The low-frequency detection shielding unit 21 also includes an RJ45 network port, which is electrically connected to the FPGA chip 211. The RJ45 network port is mainly used to connect to the platform, or for customers to query device-related parameters and set the switch of device channels, etc., and can also perform remote program upgrades, etc.

[0052] Please refer to Figure 1 A coupler 34 is electrically connected between the proximal unit 31 and the optical extension unit 32 , and the coupler 34 is an existing device on the market.

[0053] Please refer to Figure 1The number of the optical extension units 32 is five, the number of the couplers 34 is four, the four couplers 34 are connected in series with each other, three of the five optical extension units 32 are electrically connected to the proximal unit 31 through a coupler 34 respectively, and the remaining two of the five optical extension units 32 are electrically connected to the proximal unit 31 through the same coupler 34.

[0054] Please refer to Figure 1 The proximal unit 31 is connected to the optical extension unit 32 via a feeder, the optical extension unit 32 is connected to the integrated optical fiber remote unit 33 via an optical fiber, the proximal unit 31 is connected to the shielding system control platform 1 via a network cable, the proximal unit 31 is connected to the low-frequency detection shielding unit 21 via a network cable, the low-frequency detection shielding unit 21 is connected to the shielding antenna 22 via a feeder, and the low-frequency detection shielding unit 21 is connected to the listening antenna 23 via a feeder.

[0055] The bandwidth range of the shielding antenna 22 is 40M-700M, and the bandwidth range of the listening antenna 23 is 40M-700M.

[0056] Please refer to Figure 1 One optical extension unit 32 is electrically connected to sixteen integrated optical fiber remote end units 33 .

[0057] Please refer to Figure 1 The shielding system control platform 1 includes a management platform 11, a server 12 and a switch 13. The management platform 11, the server 12 and the switch 13 are all existing devices on the market. The server 12 is electrically connected to the management platform 11 and the switch 13 respectively, and the switch 13 is electrically connected to the proximal unit 31 and several low-frequency detection shielding units 21 respectively.

[0058] The low-frequency detection and blocking system designed in this solution can effectively supplement the weakness of the equipment on the market that only blocks the public network signals of mobile phones, and make the radio signal shielding system more perfect; the equipment that only blocks the public network signals of mobile phones only needs to add a low-frequency detection and blocking system designed in this solution to solve the problem that the full-band radio will not be exploited by criminals to conduct illegal communications, and patch our examination rooms, confidential meeting rooms, military units and other confidential places to achieve full-band shielding and foolproofness; the low-frequency detection and blocking system designed in this solution can automatically discover the target and automatically and quickly strike it accurately, so that it can hit wherever there is a point, and there will be no low-frequency communication frequency points that slip through the net to carry out illegal communications. At the same time, blacklists and whitelists can be set, and the blacklist frequencies will be blocked at all times, while the whitelist frequencies will not be affected at all times.

[0059] In summary, the utility model provides a low-frequency detection and blocking system, which sets a shielding system control platform, a low-frequency detection and blocking device and a public network shielding device. The low-frequency detection and blocking device includes a plurality of low-frequency detection and shielding units. The public network shielding device includes a proximal unit and a plurality of optical extension units. The low-frequency detection and shielding unit is used to collect the low-frequency signal of the air interface, analyze the characteristic value of the low-frequency signal of the air interface, output the frequency point of the low-frequency communication, and then automatically filter and process each frequency point in combination with the black and white list. For the low-frequency frequency point that needs to be blocked, an interference code is transmitted to block the mutual communication of the low-frequency modules; the listening antenna is used to receive the low-frequency signal of the air interface. The optical fiber remote unit is used to amplify and output the interference code distributed by the optical extension unit, thereby realizing the shielding function of public network mobile phone signals, thereby achieving the purpose of shielding low-frequency wireless communication signals, and further realizing the shielding function of wireless communication signals in the entire network segment, thus protecting various examination rooms, confidential meeting rooms, military units and other confidential places.

[0060] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A low-frequency detection and blocking system, characterized in that: It includes a shielding system management and control platform, a low-frequency detection and blocking device, and a public network shielding device. The low-frequency detection and blocking device includes several low-frequency detection and shielding units, and the public network shielding device includes a proximal unit and several optical extension units. The shielding system control platform is electrically connected to the proximal unit and several low-frequency detection and shielding units respectively, the proximal unit is electrically connected to several optical extension units respectively, each of the optical extension units is electrically connected to several integrated optical fiber remote units, and each of the low-frequency detection and shielding units is electrically connected to a shielding antenna and a listening antenna.

2. The low-frequency detection and blocking system according to claim 1, characterized in that: The low-frequency detection shielding unit includes an FPGA chip and an AD / DA converter. The FPGA chip is electrically connected to the shielding system management and control platform and the AD / DA converter respectively. The analog-to-digital conversion end of the AD / DA converter is electrically connected to the listening antenna, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the shielding antenna.

3. The low-frequency detection and blocking system according to claim 2, characterized in that: The low-frequency detection shielding unit also includes a low-noise amplifier and a power amplifier. The analog-to-digital conversion end of the AD / DA converter is electrically connected to the listening antenna through the low-noise amplifier, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the shielding antenna through the power amplifier.

4. The low-frequency detection and blocking system according to claim 3, characterized in that: The low-frequency detection shielding unit also includes a first radio frequency module and a second radio frequency module. The analog-to-digital conversion end of the AD / DA converter is electrically connected to the low-noise amplifier through the first radio frequency module, and the digital-to-analog conversion end of the AD / DA converter is electrically connected to the power amplifier through the second radio frequency module.

5. The low-frequency detection and blocking system according to claim 1, characterized in that: A coupler is electrically connected between the proximal unit and the optical extension unit.

6. The low-frequency detection and blocking system according to claim 5, characterized in that: The number of the optical extension units is five, the number of the couplers is four, the four couplers are connected to each other in series, three of the five optical extension units are electrically connected to the proximal unit through a coupler respectively, and the remaining two of the five optical extension units are electrically connected to the proximal unit through the same coupler.

7. The low-frequency detection and blocking system according to claim 1, characterized in that: The proximal unit is connected to the optical extension unit via a feeder, the optical extension unit is connected to the integrated optical fiber remote unit via an optical fiber, the proximal unit is connected to the shielding system management and control platform via a network cable, the proximal unit is connected to the low-frequency detection shielding unit via a network cable, the low-frequency detection shielding unit is connected to the shielding antenna via a feeder, and the low-frequency detection shielding unit is connected to the listening antenna via a feeder.

8. The low-frequency detection and blocking system according to claim 1, characterized in that: The bandwidth range of the shielding antenna is 40M-700M, and the bandwidth range of the listening antenna is 40M-700M.

9. The low-frequency detection and blocking system according to claim 1, characterized in that: One optical extension unit is electrically connected to sixteen integrated optical fiber remote end units.

10. The low-frequency detection and blocking system according to claim 1, characterized in that: The shielding system control platform includes a management platform, a server and a switch. The server is electrically connected to the management platform and the switch respectively. The switch is electrically connected to the proximal unit and a plurality of low-frequency detection and shielding units respectively.

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