CN109525356B - Management and control method for cheating radio signals in strong-immunity examination - Google Patents
Management and control method for cheating radio signals in strong-immunity examination Download PDFInfo
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- CN109525356B CN109525356B CN201811140031.1A CN201811140031A CN109525356B CN 109525356 B CN109525356 B CN 109525356B CN 201811140031 A CN201811140031 A CN 201811140031A CN 109525356 B CN109525356 B CN 109525356B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000036039 immunity Effects 0.000 claims abstract description 10
- 238000001228 spectrum Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000011217 control strategy Methods 0.000 claims description 2
- 230000008034 disappearance Effects 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 7
- 230000001629 suppression Effects 0.000 abstract description 4
- 230000010485 coping Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/43—Jamming having variable characteristics characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/22—Countermeasures against jamming including jamming detection and monitoring
- H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/46—Jamming having variable characteristics characterized in that the jamming signal is produced by retransmitting a received signal, after delay or processing
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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- Remote Sensing (AREA)
- Pinball Game Machines (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a method for controlling cheating radio signals in an examination with strong immunity, which comprises the steps of intercepting the cheating signals by using receiving equipment, completely recording the cheating signals, wherein the recorded cheating signals comprise means for resisting the disturbance, such as a communication mode, a coding mode, an encryption mode and the like used by a cheating party, and the recorded cheating signals are transmitted as the recorded cheating signals so as to be capable of well coping with the characteristics of strong immunity of the cheating equipment. The effective suppression of the cheating signal can be achieved by continuously and cyclically transmitting the recorded cheating signal or transmitting the cheating signal for a period of time when the cheating signal reappears.
Description
Technical Field
The invention relates to the technical field of radio control in a wireless communication system, in particular to a method for controlling cheating radio signals in an examination with strong immunity.
Background
With the progress and development of science and technology, more and more illegal persons use radio communication to conduct examination cheating, so that fairness and fairness of various examinations in China are seriously influenced, and poor social influence is caused. From the perspective of overhead electromagnetic wave order supervision, the frequency range used by the general examination cheating will be wider, the transmitting station equipment is a 'three nothing' product, the transmitting power is larger, and the interference to various normal radio communication services is easy to cause. So the radio examination cheating has great social hazard.
At present, a conventional way of suppressing the cheating radio signal in an examination room is to arrange a suppressing device in the range of the examination room, and after the occurrence of the cheating signal at a certain frequency point is found, the suppressing device is used to emit a suppressing signal with higher power than the cheating signal (the suppressing signal is generally a signal with nonsensical relative to the cheating information such as a single-tone carrier wave, white noise and the like) at the frequency point of the cheating signal, so that the receiving device cannot correctly receive the cheating signal, and the aim of suppressing the cheating signal in the examination is fulfilled. However, with the development of radio communication technology, many examination cheating devices use communication methods (spread spectrum technology, coding technology, etc.) with strong immunity. When the conventional suppressing method is used for coping with such cheating signals, if a better suppressing effect is expected, the transmitting power is required to be 10-100 times (hundreds of watts-kilowatts level) or more than the transmitting power of the cheating signal transmitting device. But in the practical use pressing equipment in a relatively close range, workers or students can exist, the use of high emission power can cause adverse effects on human health, meanwhile, the volume of the high-power emission equipment is relatively larger, portability is reduced, and the practical application effect is poor in comprehensive view. Therefore, a method capable of coping with such strong tamper-resistant cheating radio signals is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a control method for the cheating radio signal for the strong anti-interference test, which can overcome the inefficiency and the deficiency of the conventional suppressing method when the cheating radio signal for the high anti-interference test is handled.
The technical scheme of the invention is as follows:
a method for controlling cheating radio signals in an examination with strong immunity is characterized by comprising the following steps:
(1) Collecting cheating signals: monitoring a frequency band of a target cheating signal, when the cheating signal appears, acquiring the cheating signal by using monitoring and receiving, wherein the sampling rate is 51.2MHz, the data bit width is 16 bits, and storing the data as a data file;
(2) Analysis of cheating signals: recording basic characteristic parameters of the collected cheating signals, and corresponding to the collected data one by one;
(3) Controlling cheating signals: when the cheating signal appears again or is expected to continuously suppress a certain frequency, the collected cheating signal is transmitted through the control equipment according to the control strategy, so that the control of the cheating signal is realized.
According to the invention of the scheme, in the step (1), the triggering mode is that the template of the pre-storage mechanism triggers the acquisition.
Compared with a general template triggering acquisition mode that acquisition is started after signal power is higher than that of a template (a part of information when a cheating signal just starts to appear is missed due to response time of a system), the pre-storage mechanism used by the method can always buffer acquired data for a period of time. After the acquisition is triggered by the cheating signal, the cached data is also stored together, so that the cheating signal can be completely stored.
According to the invention of the above scheme, in the step (2), the basic characteristic parameters of the collected cheating signals comprise center frequency, bandwidth, power, duration and discovery time.
According to the invention of the scheme, in the step (3), the collected cheating signals are used for pressing when the control pressing is carried out.
Therefore, the suppression effect of the control suppression signal can be effectively prevented from being suppressed by the strong immunity cheating communication system, and the system can also well control and suppress the strong immunity cheating radio signal.
The invention relates to a method for controlling an examination cheating radio signal aiming at strong interference immunity, which is a method for controlling the examination cheating radio signal, which is developed and designed by utilizing a software radio signal processing technology, has wide adaptability and is convenient to realize on common radio monitoring and controlling equipment. The method comprises the steps of utilizing high-sampling-rate receiving equipment to completely collect cheating signals, transmitting recorded cheating signals when the reappeared suppressing signals are required to be controlled or a certain frequency point is required to be continuously interfered, and utilizing the strong correlation between the recorded cheating signals and the cheating receiving device, enabling the cheating receiving device to always receive repeated interference information transmitted by the controlling equipment, further failing to correctly and normally receive the cheating information, realizing continuous suppression, and completing effective control of high-noise-immunity examination cheating radio signals.
Drawings
FIG. 1 is a block diagram of an overall implementation of an embodiment of the present invention;
FIG. 2 is a flow chart of a template acquisition and cheating signal triggering implementation in an embodiment of the present invention;
FIG. 3 is a flow chart of an implementation of a data pre-caching mechanism according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and technical advantages of the present invention more apparent, the present invention will be further described and illustrated in detail with reference to the accompanying drawings and embodiments. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
The invention discloses a method for controlling cheating radio signals in an examination with strong immunity, which comprises the following steps:
as shown in figure 1 of the drawings,
step 101: and (3) spectrum template acquisition: the receiving equipment is used for collecting the frequency spectrum in the normal state of the frequency band which is easy to generate the cheating signal, and the frequency band spectrogram in the normal state is used as a reference template in the subsequent steps.
Step 102: waiting for a cheating signal: the real-time frequency band spectrogram is continuously compared with the collected normal frequency band template, and when the frequency band spectrogram is used as a cheating signal, the frequency spectrum is obviously different from the normal frequency band template. The frequency point of the cheating signal can be locked through the difference in frequency spectrum, then whether the cheating signal is acquired within 2 hours is searched in the database, if so, the process is continued in the step 104, and if not, the process is continued in the step 103.
Step 103: triggering and collecting cheating signals: if it is determined in step 102 that the acquisition of the cheating signal is required, the buffered radio signal data and the radio signal data currently being generated are recorded together, so that the stored data can better cover the whole cheating signal process. And after detecting that the cheating signal disappears, ending the collection of the radio signal and completing the collection of the current cheating signal. And then returns to step 102 to continue waiting for the occurrence of the cheating signal.
Step 104: selecting cheating signal data: the frequency point of the detected cheating signal is taken as a main screening condition to select the cheating signal collected before in the database, and the collected data of the cheating signal with the latest discovery time is generally selected as a data source to be transmitted.
Step 105: the data of the cheating signal is transmitted to the transmitting module, and the transmitting module transmits the recorded cheating signal with higher power than the cheating signal, so that the aim of suppressing the cheating signal is fulfilled.
As shown in the figure 2 of the drawings,
step 201: the frequency band of the cheating signal which is easy to generate the examination and needs to be monitored is divided into a plurality of cells according to the maximum intermediate frequency bandwidth value supported by the receiving equipment, for example: the maximum intermediate frequency bandwidth value of the equipment is 40MHz, the frequency band to be monitored is 100MHz-200MHz, and the divided cells are: 100MHz-140MHz, 140MHz-180MHz, 180MHz-200MHz.
Step 202: when no examination is active, the receiving equipment is used for storing the spectrum maximum curves among the cells, and then the spectrum maximum curves are spliced into a trigger template of the whole monitored frequency band. The triggering template is actually the spectrum maximum value of the target frequency band when no examination cheating signal exists.
Step 203: when the test is carried out, the frequency spectrum of the target frequency band is monitored in real time, when the cheating signal appears, the maximum value of the real time frequency spectrum is higher than the maximum value curve of the template, and the signal strength is generally considered to be 3dB higher than or equal to the maximum value curve of the template, namely the cheating signal appears at the frequency point, and then the cheating signal can be collected at the frequency point.
As shown in the figure 3 of the drawings,
in a general trigger acquisition process, after the spectrum data (after FFT conversion, i.e. output of the module 304) triggers the template, the signal sampling data output by the module 302 is stored again, so that a part of the obtained signal information is lost. The pre-buffering mechanism is to add 303 a buffering module to continuously buffer the data outputted by 302. The size of the buffer interval is not required to be large, but the buffer interval is required to be larger than the data volume covered by the time delay from the system triggering to the acquisition, in this state, when the triggering occurs, the buffered data and the real-time sampling data are spliced together through the 305 module, so that the complete cheating signal sampling data can be output.
The module or device provided by the embodiment of the invention is only divided into functional partitions, and can be physically combined or divided. The names of the modules or devices may vary with the technical evolution or application scenario, but are still considered to be within the scope of the present invention. It will be appreciated by those of ordinary skill in the art that implementing all or part of the steps of the methods of the embodiments described above may be accomplished by a program that is stored on a computer readable storage medium and that, when executed, includes instructions for performing the methods of the various embodiments of the invention. A storage medium as described herein, such as: ROM/RAM, magnetic disks, optical disks, etc.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (2)
1. A method for controlling cheating radio signals in an examination with strong immunity is characterized by comprising the following steps:
(1) Collecting cheating signals: monitoring a frequency band of a target cheating signal, when the cheating signal appears, acquiring the cheating signal by using monitoring and receiving, wherein the sampling rate is 51.2MHz, the data bit width is 16 bits, and storing the data as a data file;
triggering and collecting a template of a pre-storage mechanism in a triggering mode, caching collected data for a period of time, and splicing the cached data and the real-time sampled data through a data splicing module;
dividing a frequency band to be monitored into a plurality of cells according to a maximum intermediate frequency bandwidth value supported by receiving equipment, storing a spectrum maximum value curve among the cells by using the receiving equipment when examination activities are not performed, and then splicing the spectrum maximum value curve into a trigger template of the whole monitored frequency band;
(101) Collecting a frequency spectrum in a normal state of a frequency band which is easy to generate cheating signals by using receiving equipment, wherein a frequency band spectrogram in the normal state is used as a reference template in a subsequent step;
(102) The real-time frequency band spectrogram is continuously compared with the collected normal frequency band template, and when the frequency band spectrogram is used as a cheating signal, the frequency spectrum is obviously different from the normal frequency band template; firstly locking the frequency point of the cheating signal through the difference of the frequency spectrum, then searching whether the cheating signal is acquired within 2 hours in the frequency point in the database, if so, continuing the process in the step (3), and if not, continuing the process in the step (103);
(103) The cached radio signal data and the radio signal data which are currently generated are recorded together, so that the stored data can better cover the whole cheating signal process, and when the disappearance of the cheating signal is detected, the collection of the radio signal is finished, and the collection of the current cheating signal is completed;
(2) Analysis of cheating signals: recording basic characteristic parameters of the collected cheating signals, and corresponding to the collected data one by one;
(3) Controlling cheating signals: when the cheating signals reappear or the continuous pressing of a certain frequency is expected, the collected cheating signals are transmitted through the control equipment according to the control strategy, so that the control of the cheating signals is realized, the collected cheating signals are used for pressing when the control pressing is carried out, data of the cheating signals are transmitted to the transmitting module, and the transmitting module transmits recorded cheating signals with higher power than the cheating signals.
2. The method of claim 1, wherein in step (2), the basic characteristic parameters of the collected cheating signals include center frequency, bandwidth, power, duration, and discovery time.
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| CN201811140031.1A CN109525356B (en) | 2018-09-28 | 2018-09-28 | Management and control method for cheating radio signals in strong-immunity examination |
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| CN201811140031.1A CN109525356B (en) | 2018-09-28 | 2018-09-28 | Management and control method for cheating radio signals in strong-immunity examination |
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