Anti-wireless secret-stealing detection system based on antenna resonance-frequency spectrum identification

Abstract

The invention belongs to the technical field of information security, and particularly relates to an anti-wireless secret-stealing detection system based on antenna resonance-spectrum identification, which comprises a signal transceiving unit, a broadband antenna and an upper computer, and is characterized in that the signal transceiving unit is electrically connected with the broadband antenna, and the signal transceiving unit is connected with the upper computer. According to the method, the wireless secret stealing device embedded in high-level camouflage objects such as electronic equipment and cables can be identified more effectively, and effective detection can be performed no matter whether the secret stealing device is started or not. Based on an antenna resonance spectrum identification mode, the reflection echo signal of the wireless secret stealing device can be captured, noise interference in a complex electromagnetic environment is effectively suppressed through a pulse coherent integration technology, and the detection precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of information security, and in particular relates to an anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition. Background Art

[0002] With the rapid development of wireless communication technology, the speed and range of information transmission have been greatly improved. However, while modern communication technology brings convenience, the problem of information security has also become increasingly prominent. Traditional espionage methods are gradually changing to information theft based on wireless espionage with stronger concealment. The miniaturization of the size and concealment of the espionage device have brought great challenges to anti-espionage reconnaissance and posed a serious threat to personal privacy, corporate secrets and national security. Wireless espionage is represented by wireless eavesdroppers / wireless cameras, which modulate the received sound, video and other information to achieve long-distance theft of information. In recent years, with the improvement of chip design and semiconductor manufacturing technology, espionage technology has developed into active electromagnetic attacks implanted in information processing equipment by micro-devices. These devices use wireless signal transmission technology to steal sensitive information without being easily detected, including voice, data, video and other information forms. Because wireless espionage devices have the characteristics of strong concealment, convenient operation and low cost, they have brought great challenges to traditional security protection measures.

[0003] At present, there are related products for detecting wireless stealing devices. Common detection equipment can be divided into two types: active detection and passive detection. Active detection equipment detects whether the target contains metal junctions and PN junctions, and can effectively identify simple stealing devices hidden in buildings and decorations; passive detection equipment searches for wireless stealing devices by detecting whether there are illegal electromagnetic signals in the environment. However, due to the high camouflage and micro-integration implantability of current wireless stealing devices, traditional anti-stealing devices have a high false alarm rate and low search efficiency. With the continuous evolution of new wireless stealing devices, new challenges have been brought to anti-wireless stealing.

[0004] Therefore, how to effectively and quickly identify and locate wireless stealing devices has become a technical problem that needs to be solved in the current information security field. Developing a new and efficient anti-wireless stealing detection system is of great significance for ensuring information security and preventing potential stealing threats. Summary of the invention

[0005] In view of the technical problems of high false alarm rate and low search efficiency in the above-mentioned traditional anti-espionage devices, the present invention provides an anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition, which irradiates electromagnetic pulse signals to the target and uses the pulse coherent integration method to analyze the echo signal spectrum of the target. Moreover, no matter whether the target is turned on or off, the concealed wireless eavesdropping device can be searched.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition comprises a signal transceiver unit, a broadband antenna and a host computer, wherein the signal transceiver unit is electrically connected to the broadband antenna, and the signal transceiver unit is connected to the host computer.

[0008] The signal transceiver unit includes a signal synthesis module, a power amplification module, an antenna switch, a signal receiving module, a data processing module and a display control module. The signal synthesis module is connected to the power amplification module, the power amplification module is connected to the antenna switch, the antenna switch is connected to the signal receiving module, the signal receiving module is connected to the data processing module, the data processing module is connected to the display control module, and the broadband antenna is electrically connected to the antenna switch.

[0009] The signal frequency range generated by the signal synthesis module covers 30MHz to 3000MHz, and the frequency resolution of the signal synthesis module is not greater than 0.1%; the frequency range of the amplification module is 30MHz to 3000MHz, and the output power of the amplification module is not less than 33dBm.

[0010] The maximum input power of the antenna switch is not less than 36dBm, the loss of the antenna switch is less than 2dB, and the switching speed of the antenna switch is not more than 15ns; the dynamic range of the signal receiving module is not less than 80dB, and the noise coefficient of the signal receiving module is not more than 3dB.

[0011] The data processing module adopts FPGA, contains 10,000 logic units, built-in 41kbit RAM, 23 multipliers, configured with 66 LVDS high-speed channels, and uses an ADC with a sampling rate of 500MSa / s to pre-process the received signal; the display control module adopts a 32-bit ARM Cortex-M4F core microprocessor, and interacts with the host computer through USB and Ethernet ports; the broadband antenna adopts a logarithmic periodic antenna, and the frequency band covers 30MHz to 3000MHz.

[0012] A detection method for an anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition includes the following steps: S1, setting up a network connection; S2, detecting through a broadband search mode; S3, detecting through a fixed frequency search mode.

[0013] The method for setting up the network connection in S1 is:

[0014] S1.1. Connect the broadband antenna to the signal transceiver unit through the SMA interface, and the signal transceiver unit is connected to the host computer;

[0015] S1.2. Call the settings window and select Settings and Connections from the main menu of the program to display the program communication settings window;

[0016] S1.3. Open the program communication settings window of the COM port settings tab;

[0017] S1.4. Select in turn the baud rate, data bits, stop bits, parity, flow control, character interval timeout, and packet interval timeout; the COM port field contains all currently available PC COM ports; select the COM port that can exchange data and click the Save button; in this case, the communication settings window will be closed and the program will try to communicate with the detection system using the selected port.

[0018] The method for detecting by broadband search mode in S2 is:

[0019] S2.1. Power on the system, open the host computer software, set the scanning frequency range and power value, and perform system calibration test;

[0020] S2.2. Set the detection pulse parameters, including: pulse duration, scanning period within the frequency range, and number of frequency points in the scanning mode;

[0021] S2.3, use the antenna to perform broadband search detection, and the host computer displays the spectrum of the received signal;

[0022] S2.4. When a wireless stealing device is detected, a sound signal will be heard in the speaker or stereo headphones. When the antenna is close to the wireless stealing device, the pitch of the audio signal increases.

[0023] The method for detecting by fixed frequency search mode in S3 is:

[0024] S3.1. Select the frequency setting menu, set the search frequency value, and start fixed frequency search;

[0025] S3.2. After completing a fixed frequency search, switch the search frequency point and start searching other frequencies.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention can more effectively identify wireless stealing devices embedded in highly disguised objects such as electronic devices and cables, and can effectively detect whether the stealing devices are turned on or not. The present invention is based on the antenna resonance spectrum recognition method, which can capture the reflected echo signal of the wireless stealing device. Through the pulse coherent integration technology, it can effectively suppress the noise interference in the complex electromagnetic environment and improve the detection accuracy. In addition, the hardware architecture of the present invention can realize a fast scanning search of the frequency band range of 30MHz to 3000MHz, with a dynamic range of more than 80dB, which can ensure high sensitivity of reception. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0029] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0030] Figure 1 It is a structural block diagram of the present invention;

[0031] Figure 2 It is a structural block diagram of the signal transceiver unit of the present invention;

[0032] Figure 3 This is a schematic diagram of the detection spectrum of the present invention.

[0033] Among them: 1 is a signal transceiver unit, 2 is a broadband antenna, 3 is a host computer, 101 is a signal synthesis module, 102 is a power amplification module, 103 is an antenna switch, 104 is a signal receiving module, 105 is a data processing module, and 106 is a display control module. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. These descriptions are only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] An anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition, such as Figure 1 As shown, it includes a signal transceiver unit 1, a broadband antenna 2 and a host computer 3. The signal transceiver unit 1 is electrically connected to the broadband antenna 2, and the signal transceiver unit 1 is connected to the host computer 3.

[0038] Further, if Figure 2 As shown, the signal transceiver unit 1 includes a signal synthesis module 101, a power amplifier module 102, an antenna switch 103, a signal receiving module 104, a data processing module 105 and a display control module 106. The signal synthesis module 101 realizes the pulse modulated transmission signal waveform, and the generated signal frequency range covers 30MHz to 3000MHz, and the frequency resolution is not greater than 0.1%. The power amplifier module 102 realizes the amplification of the transmission signal, the frequency range is 30MHz to 3000MHz, and the output power is not less than 33dBm. The antenna switch 103 realizes the fast switching between the transmission mode and the receiving mode, the maximum input power is not less than 36dBm, the loss is less than 2dB, and the switching speed is not more than 15ns.

[0039] Furthermore, the signal receiving module 104 realizes receiving the reflected signal, with a dynamic range of not less than 80dB and a noise figure of not more than 3dB. The received signal enters the antenna, and is amplified by a broadband preselection amplifier with an amplification gain of 16dB and a gain flatness of not more than 1dB. The RF signal is down-converted by a mixer, and the intermediate frequency is 133MHz, with an intermediate frequency bandwidth of 40MHz. The intermediate frequency signal is filtered out of interference by a filter, and is amplified by an intermediate frequency with an intermediate frequency gain of 22dB. Finally, the signal is detected and output by a logarithmic detector with a dynamic range of 100dB.

[0040] Furthermore, the data processing module 105 uses FPGA, contains 10,000 logic units, built-in 41kbit RAM, 23 multipliers, 66 LVDS high-speed channels, and uses an ADC with a sampling rate of 500MSa / s to pre-process the received signal. The display control module 106 uses a 32-bit ARM Cortex-M4F core microprocessor and interacts with the host computer through USB and Ethernet ports. The broadband antenna 2 uses a logarithmic periodic antenna with a frequency band covering 30MHz to 3000MHz.

[0041] Furthermore, the software portion of this embodiment uses an algorithm based on pulse coherent integration to analyze and identify the system's received signals. In order to suppress interference from the complex electromagnetic environment around it, the interference signals in the background environment are collected and recorded before the system is tested. Pulse modulation waves of different frequencies are generated according to the set scanning frequency range. By transmitting pulse signals multiple times and superimposing them, the response amplitude of the reflected signal of the target under test is enhanced, and the interference of other incoherent signals such as background noise is effectively reduced. By analyzing the relative level changes of the received signal and deeply analyzing and comparing the spectrum characteristics of the antenna resonance response signal, the identification and positioning of the wireless eavesdropping device can be achieved. Figure 3 As shown, Figure 3 In order to use the broadband antenna 2 to perform wideband search detection, the host computer 3 displays the spectrum of the received signal.

[0042] A detection method of an anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition comprises the following steps:

[0043] Step 1: Set up the network connection:

[0044] Step 1.1: Connect the broadband antenna to the signal transceiver unit through the SMA interface, and connect the signal transceiver unit to the host computer.

[0045] Step 1.2, call the settings window, select the Settings and Connections item from the program's main menu to display the program communication settings window.

[0046] Step 1.3. Open the program communication settings window of the COM port settings tab.

[0047] Step 1.4. Select the baud rate, data bits, stop bits, parity, flow control, character interval timeout, and packet interval timeout in sequence. The COM port field contains all currently available PC COM ports. Select the COM port with which data can be exchanged and click the Save button. In this case, the communication settings window will be closed and the program will try to communicate with the detection system using the selected port.

[0048] Step 2: Detection via broadband search mode:

[0049] Step 2.1: Power on the system, open the host computer software, set the scanning frequency range and power value, and perform system calibration test.

[0050] Step 2.2: Set the detection pulse parameters, including pulse duration, scanning period within the frequency range, and number of frequency points in the scanning mode.

[0051] Step 2.3: Use the antenna to perform wideband search detection, and the host computer displays the spectrum of the received signal.

[0052] Step 2.4: When a wireless stealing device is detected, a sound signal will be heard in the speaker or stereo headphones. When the antenna is close to the wireless stealing device, the tone of the audio signal increases.

[0053] Step 3: Detection through fixed frequency search mode:

[0054] Step 3.1. Select the frequency setting menu, set the search frequency value, and start fixed frequency search.

[0055] Step 3.2: After completing a fixed frequency search, switch the search frequency point and start searching other frequencies.

[0056] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. An anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition, characterized in that: The invention comprises a signal transceiver unit (1), a broadband antenna (2) and a host computer (3); the signal transceiver unit (1) is electrically connected to the broadband antenna (2), and the signal transceiver unit (2) is connected to the host computer (3).

2. The anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to claim 1 is characterized in that: The signal transceiver unit (1) comprises a signal synthesis module (101), a power amplification module (102), an antenna switch (103), a signal receiving module (104), a data processing module (105) and a display control module (106); the signal synthesis module (101) is connected to the power amplification module (102); the power amplification module (102) is connected to the antenna switch (103); the antenna switch (103) is connected to the signal receiving module (104); the signal receiving module (104) is connected to the data processing module (105); the data processing module (105) is connected to the display control module (106); and the broadband antenna (2) is electrically connected to the antenna switch (103).

3. The anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to claim 2 is characterized in that: The signal frequency range generated by the signal synthesis module (101) covers 30MHz to 3000MHz, and the frequency resolution of the signal synthesis module (101) is not greater than 0.1%; the frequency range of the amplification module (102) is 30MHz to 3000MHz, and the output power of the amplification module (102) is not less than 33dBm.

4. The anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to claim 2, characterized in that: The maximum input power of the antenna switch (103) is not less than 36 dBm, the loss of the antenna switch (103) is less than 2 dB, and the switching speed of the antenna switch (103) is not more than 15 ns; the dynamic range of the signal receiving module (104) is not less than 80 dB, and the noise coefficient of the signal receiving module (104) is not more than 3 dB.

5. The anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to claim 2, characterized in that: The data processing module (105) adopts FPGA, contains 10,000 logic units, has a built-in 41 kbit RAM, 23 multipliers, is configured with 66 LVDS high-speed channels, and uses an ADC with a sampling rate of 500 MSa / s to pre-process the received signal; the display control module (106) adopts a 32-bit ARM Cortex-M4F core microprocessor, and interacts with a host computer through a USB and Ethernet port; the broadband antenna (2) adopts a logarithmic periodic antenna, and the frequency band covers 30 MHz to 3000 MHz.

6. A detection method for an anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1, setting up a network connection; S2, detecting through a broadband search mode; and S3, detecting through a fixed frequency search mode.

7. The detection method of the anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to claim 6 is characterized in that: The method for setting up the network connection in S1 is: S1.

1. Connect the broadband antenna to the signal transceiver unit through the SMA interface, and the signal transceiver unit is connected to the host computer; S1.

2. Call the settings window and select Settings and Connections from the main menu of the program to display the program communication settings window; S1.

3. Open the program communication settings window of the COM port settings tab; S1.

4. Select in turn the baud rate, data bits, stop bits, parity, flow control, character interval timeout, and packet interval timeout; the COM port field contains all currently available PC COM ports; select the COM port that can exchange data and click the Save button; in this case, the communication settings window will be closed and the program will try to communicate with the detection system using the selected port.

8. The detection method of the anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to claim 6, characterized in that: The method for detecting by broadband search mode in S2 is: S2.

1. Power on the system, open the host computer software, set the scanning frequency range and power value, and perform system calibration test; S2.

2. Set the detection pulse parameters, including: pulse duration, scanning period within the frequency range, and number of frequency points in the scanning mode; S2.3, use the antenna to perform broadband search detection, and the host computer displays the spectrum of the received signal; S2.

4. When a wireless stealing device is detected, a sound signal will be heard in the speaker or stereo headphones. When the antenna is close to the wireless stealing device, the pitch of the audio signal increases.

9. The detection method of the anti-wireless eavesdropping detection system based on antenna resonance-spectrum recognition according to claim 6, characterized in that: The method for detecting by the fixed frequency search mode in S3 is: S3.

1. Select the frequency setting menu, set the search frequency value, and start fixed frequency search; S3.

2. After completing a fixed frequency search, switch the search frequency point and start searching other frequencies.

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