阅读说明：本技术 一种信号监测干扰方法 (Signal monitoring interference method ) 是由 李声扬 徐殿福 邓志忠 李春 陈智强 赵航云 朱玉梅 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种信号监测干扰方法,包括以下步骤：步骤一：扫描接收监测区域的无线信号,并对无线信号依次进行频谱搬移、AD转换、数字下变频、FIR滤波和抽取处理,变换成I/Q信号；步骤二：对I/Q信号进行基带处理,得到频谱信号,分析得出监测区域中是否存在可疑无线信号；若存在可疑无线信号,则根据可疑无线信号的频率生成对应的干扰信号；步骤三：先对干扰信号进行上变频处理,再对干扰信号进行功率放大,最后将功率放大后的干扰信号发射到监测区域进行干扰。本发明能够有效监测出使用区域的可疑无线信号,并生成相应频率的频谱信号进行干扰,从而达到有效保护隐私的目的。(The invention discloses a signal monitoring interference method, which comprises the following steps: the method comprises the following steps: scanning and receiving wireless signals of a monitoring area, and sequentially carrying out frequency spectrum moving, AD conversion, digital down-conversion, FIR filtering and extraction processing on the wireless signals to convert the wireless signals into I/Q signals; step two: performing baseband processing on the I/Q signal to obtain a frequency spectrum signal, and analyzing to obtain whether a suspicious wireless signal exists in a monitoring area; if the suspicious wireless signals exist, generating corresponding interference signals according to the frequency of the suspicious wireless signals; step three: the method comprises the steps of firstly carrying out up-conversion processing on interference signals, then carrying out power amplification on the interference signals, and finally transmitting the interference signals after power amplification to a monitoring area for interference. The invention can effectively monitor suspicious wireless signals of a using area and generate frequency spectrum signals with corresponding frequencies for interference, thereby achieving the purpose of effectively protecting privacy.)

1. A method for signal monitoring interference, comprising: the method comprises the following steps:

the method comprises the following steps: scanning and receiving wireless signals of a monitoring area, and sequentially carrying out frequency spectrum moving, AD conversion, digital down-conversion, FIR filtering and extraction processing on the received wireless signals to convert the wireless signals into I/Q signals;

step two: performing baseband processing on the I/Q signal to obtain a frequency spectrum signal corresponding to the received wireless signal, and analyzing according to the frequency spectrum signal to obtain whether a suspicious wireless signal exists in a monitoring area; if the suspicious wireless signals exist in the monitoring area, continuing to scan the wireless signals, and if the suspicious wireless signals exist in the monitoring area, generating corresponding interference signals according to the frequency of the suspicious wireless signals;

step three: the method comprises the steps of firstly carrying out up-conversion processing on interference signals, then carrying out power amplification on the interference signals, and finally transmitting the interference signals after power amplification to a monitoring area for interference.

2. A method for signal monitoring interference according to claim 1, wherein: the receiving frequency range of the wireless signals in the first step is 70 MHz-6 GHz, and the receiving sensitivity is-90 dBm; the rate of baseband processing in the second step is 190-210 Mbps; and in the third step, the output power of the amplified interference signal is 1W, and the transmission frequency range of the interference signal is 70 MHz-6 GHz.

3. A signal interference monitoring method according to claim 1 or 2, characterized by: the signal interference monitoring method is realized by an interference monitoring system, wherein the interference monitoring system comprises a baseband processor (3), an integrated broadband RF signal processor (5), a transmitting antenna (6), a receiving antenna (7) and a power amplifier (8), wherein the receiving antenna (7) is used for scanning and receiving wireless signals in a monitoring area; the integrated broadband RF signal processor (5) is used for carrying out frequency spectrum moving, AD conversion, digital down-conversion, FIR filtering and extraction processing on the received wireless signals in sequence and converting the wireless signals into I/Q signals; the baseband processor (3) is used for performing baseband processing on the I/Q signals, analyzing suspicious wireless signals, generating interference signals and sending the interference signals to the integrated broadband RF signal processor (5) for up-conversion processing; the power amplifier (8) is used for carrying out power amplification processing on the interference signal; the transmitting antenna (6) is used for transmitting the interference signal after power amplification to the monitoring area.

4. A signal interference monitoring method according to claim 3, wherein: the interference monitoring system further comprises a main controller (2), a storage module (4), a communication module and a power management module (11) for supplying power, wherein the main controller (2) is connected with the baseband processor (3) and is used for configuring, managing and controlling the baseband processor (3); the storage module (4) is connected with the baseband processor (3) and used for storing the received frequency spectrum data; the communication module is respectively connected with the main controller (2) and the baseband processor (3) and is used for communicating with an external mobile terminal.

5. The method of claim 4, wherein the step of monitoring the interference comprises: the baseband processor (3), the integrated broadband RF signal processor (5), the receiving antenna (7), the power amplifier (8), the main controller (2), the storage module (4), the communication module and the power management module (11) are integrated on the same PCB (1), and the transmitting antenna (6) is connected with the power amplifier (8).

6. A signal interference monitoring method according to claim 3, wherein: the number of the receiving antennas (7) is at least one, and the number of the transmitting antennas (6) is at least one.

7. The method of claim 4, wherein the step of monitoring the interference comprises: the communication module comprises a WLAN controller (9) and a USB controller (10) both connected with the baseband processor (3).

8. The method of claim 4, wherein the step of monitoring the interference comprises: the memory module (4) comprises two memory chips which are connected with the baseband processor (3).

9. The method of claim 5, wherein the step of monitoring the interference comprises: the length of the PCB circuit board (1) is 150 +/-0.2 mm, the width is 70 +/-0.2 mm, and the thickness is 6 +/-0.2 mm.

Technical Field

The invention relates to the technical field of information security, in particular to a signal monitoring and interference method which is mainly used for monitoring and interfering suspicious wireless signals such as wiretap, and the like and is suitable for being used in places such as families, meeting rooms, confidential places and the like.

Background

At present, with the rapid development of information technology, high-tech crime incidents such as stealing of personal privacy, implementation of economic crimes and the like by utilizing a wireless technology also occur occasionally, and the wireless technology is normalized, so that the benefits and safety of social stability, important people and the masses of people are seriously threatened. Therefore, aiming at the threat from wireless secret stealing, the system senses, effectively probes and implements uninterrupted prevention and control in time, and becomes an unbearable demand facing the information security professional field and the public population.

The special detection equipment and the technical means for preventing the wireless signal from stealing the secret in China are relatively lagged behind, no substantial product support is provided for the civil requirements, and no general equipment for protecting the personal privacy safety of important people and even common people exists. The existing suspicious wireless signal detection and discovery method is to detect and discover by means of general detection equipment or imported special equipment, but has the following disadvantages: the general detection equipment is temporary and non-targeted inspection equipment, the performance requirement of monitoring the equipment in long-term work is not considered in the design process, and the detection result is different from person to person and time to time and lacks scientificity, continuity and integrity. And secondly, most foreign special detection analyzers are export-restricted products and are controlled more severely by foreign governments and related departments. Currently, most of the commonly used inspection instruments and equipment are products of western national companies. Such as: the system comprises a full-frequency anti-eavesdropping analyzer OSC-5000, a fixed telephone anti-eavesdropping analyzer E00841, a CMA-100 anti-eavesdropping audio detector, a CPM-700 anti-eavesdropping detector and the like. Although these devices are available in bends, there is always a risk of being shielded from stealing the frequency band used. The domestic equipment can not be replaced by stable and reliable special equipment. And the equipment related to the technology is large in size, expensive, incapable of being deployed in a large amount, and inconvenient to popularize to personal privacy protection and use in a small-area.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a signal monitoring interference method, which can effectively monitor suspicious wireless signals of a use area and generate interference signals of corresponding frequencies for interference, thereby achieving the purpose of effectively protecting privacy.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method for signal monitoring interference, comprising: the method comprises the following steps:

the method comprises the following steps: scanning and receiving wireless signals of a monitoring area, and sequentially carrying out frequency spectrum moving, AD conversion, digital down-conversion, FIR filtering and extraction processing on the received wireless signals to convert the wireless signals into I/Q signals;

step two: performing baseband processing on the I/Q signal to obtain a frequency spectrum signal corresponding to the received wireless signal, and analyzing according to the frequency spectrum signal to obtain whether a suspicious wireless signal exists in a monitoring area; if the suspicious wireless signals exist in the monitoring area, continuing to scan the wireless signals, and if the suspicious wireless signals exist in the monitoring area, generating corresponding interference signals according to the frequency of the suspicious wireless signals;

step three: the method comprises the steps of firstly carrying out up-conversion processing on interference signals, then carrying out power amplification on the interference signals, and finally transmitting the interference signals after power amplification to a monitoring area for interference.

The receiving frequency range of the wireless signals in the first step is 70 MHz-6 GHz, and the receiving sensitivity is-90 dBm; the rate of baseband processing in the second step is 190-210 Mbps; and in the third step, the output power of the amplified interference signal is 1W, and the transmission frequency range of the interference signal is 70 MHz-6 GHz.

The signal monitoring interference method is realized by a monitoring interference system, wherein the monitoring interference system comprises a baseband processor, an integrated broadband RF signal processor, a transmitting antenna, a receiving antenna and a power amplifier, wherein the receiving antenna is used for scanning and receiving wireless signals in a monitoring area; the integrated broadband RF signal processor is used for sequentially carrying out frequency spectrum shifting, AD conversion, digital down-conversion, FIR filtering and extraction processing on the received wireless signals and converting the wireless signals into I/Q signals; the baseband processor is used for performing baseband processing on the I/Q signals, analyzing suspicious wireless signals, generating interference signals and sending the interference signals to the integrated broadband RF signal processor for up-conversion processing; the power amplifier is used for carrying out power amplification processing on the interference signal; the transmitting antenna is used for transmitting the interference signal after power amplification to the monitoring area.

The interference monitoring system also comprises a main controller, a storage module, a communication module and a power management module for supplying power, wherein the main controller is connected with the baseband processor and is used for configuring, managing and controlling the baseband processor; the storage module is connected with the baseband processor and used for storing the received frequency spectrum data; the communication module is respectively connected with the main controller and the baseband processor and is used for communicating with an external mobile terminal.

The baseband processor, the integrated broadband RF signal processor, the receiving antenna, the power amplifier, the main controller, the storage module, the communication module and the power management module are integrated on the same PCB, and the transmitting antenna is connected with the power amplifier.

The number of the receiving antennas is at least one, and the number of the transmitting antennas is at least one.

The communication module comprises a WLAN controller and a USB controller which are both connected with the baseband processor.

The memory module comprises two memory chips which are connected with the baseband processor.

The length of the PCB circuit board is 150 +/-0.2 mm, the width of the PCB circuit board is 70 +/-0.2 mm, and the thickness of the PCB circuit board is 6 +/-0.2 mm.

The invention has the advantages that:

1. the invention is mainly used for monitoring and interfering the suspicious wireless signals such as wiretap, wiretap and the like, and is suitable for being used in places such as families, meeting rooms, confidential places and the like. Specifically, the first step is to sequentially perform frequency spectrum shifting, AD conversion, digital down conversion, FIR filtering and decimation on the received wireless signal, so as to convert the wireless signal into an I/Q signal. The device well solves the direct current offset and quadrature error limitation of the prior zero intermediate frequency framework through the function optimization of the quadrature error calibration and the direct current offset calibration, and therefore, an external filter is not needed. The direct transition from broadband RF to zero intermediate frequency IQ is realized, a series of intermediate links such as frequency conversion, filtering, sampling, digital up-down frequency conversion and the like are omitted, and the pressure of subsequent baseband processing is greatly reduced. And the baseband processing is carried out on the I/Q signals in the second step to obtain corresponding frequency spectrum signals, and the advantages of small volume, high reliability and strong expandability are achieved. On the premise of keeping system function and performance, the traditional baseband signal processing system is simplified, the baseband signal processing speed is increased, the development difficulty is reduced, and the cost is saved. In the third step, by carrying out up-conversion and power amplification on the interference signal, the suspicious wireless signal can be effectively interfered, so that the purpose of effectively protecting privacy is achieved. Through the specific technical scheme formed by the first step, the second step and the third step, suspicious wireless signals of the using area can be effectively monitored, and spectrum signals of corresponding frequencies are generated for interference, so that the purpose of effectively protecting privacy is achieved.

2. In the invention, the receiving frequency range of the wireless signal in the first step is set to be 70 MHz-6 GHz, and the receiving sensitivity is set to be-90 dBm; the frequency range of the wireless eavesdropping and stealing device under the prior art can be well covered by adopting the frequency of 70 MHz-6 GHz, and the monitoring and the discovery of various wireless eavesdropping and stealing devices are realized. The receiving sensitivity of-90 dBm is used for near-field monitoring, so that the interference of a large number of far-field radio signals can be eliminated, the accuracy of monitoring the near-field radio signals is enhanced, and the monitoring and finding capabilities of the wireless eavesdropping and stealing device are improved. And setting the baseband processing rate to be 190-210 Mbps in the second step, wherein the processing rate in the range has the advantages of effectively monitoring and interfering with suspicious wireless signals such as eavesdropping and stealing, reducing design difficulty and saving cost. In the third step, the output power after the interference signal is amplified is set to be 1W, which has the advantages that the suspicious wireless signal can be effectively interfered, unnecessary influence on the electromagnetic environment of other areas is avoided, and the better interference effect is ensured. The transmission frequency range of the interference signal is set to be 70 MHz-6 GHz, and the range has the advantage of full interference coverage on the monitoring frequency band.

3. The interference monitoring function of the invention is mainly realized by a monitoring interference system formed by combining components such as a baseband processor, an integrated broadband RF signal processor, a transmitting antenna, a receiving antenna and a power amplifier, because the baseband processor, the integrated broadband RF signal processor, the transmitting antenna, the receiving antenna, the power amplifier and the like generally contain 52 components, more than 10 power modules and thousands of resistance-capacitance components, the design architecture is very complex, and the components are reasonably integrated on a PCB circuit board with smaller volume, the effective monitoring and interference of suspicious wireless signals can be realized, and the invention has higher innovation. In addition, the integrated PCB is packaged into a shell with electromagnetic compatibility, so that miniaturization of the interference monitoring equipment is realized, and the integrated PCB is particularly suitable for being used in important places such as families, meeting rooms and hotels.

4. When more than one receiving antenna is used, the receiving effect of the wireless signal is better. When more than one transmitting antenna is used, the interference effect of the interference signal is better.

5. The invention adopts the WLAN controller and the USB controller as the communication modules, which is beneficial to the connection with external equipment such as a mobile terminal and the like.

6. The invention mainly adopts two memory chips as memory modules, and can store a large amount of frequency spectrum data.

7. The length of the PCB circuit board is 150 +/-0.2 mm, the width of the PCB circuit board is 70 +/-0.2 mm, the thickness of the PCB circuit board is 6 +/-0.2 mm, the size of the whole PCB circuit board is basically the same as that of the existing mobile phone, the formed product is very convenient to carry, and meanwhile, the use is more convenient.

Drawings

FIG. 1 is a functional block diagram of the present invention;

labeled as: 1. PCB circuit board, 2, main controller, 3, baseband processor, 4, storage module, 5, integrated broadband RF signal processor, 6, transmitting antenna, 7, receiving antenna, 8, power amplifier, 9, WLAN controller, 10, USB controller, 11, power management module.

Detailed Description