CN103986537B - Examination hall cheating signal Suspected Degree integrated evaluating method - Google Patents
Examination hall cheating signal Suspected Degree integrated evaluating method Download PDFInfo
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Abstract
The invention discloses a kind of examination hall cheating signal Suspected Degree integrated evaluating method, comprise the following steps: background signal learns; Background signal is offset; Simultaneously or timesharing following four category features carried out to the signal after filtering extract: temporal signatures extracts, and frequency domain character extracts, information field feature extraction, and space domain characteristic is extracted; Suspected Degree overall merit: carry out scoring in conjunction with black and white lists to above-mentioned each category feature and obtain quantized values, then be weighted average computation to four class quantization numerical value, obtains comprehensive quantification numerical value, realizes overall merit.The present invention is by carrying out overall merit from time domain, frequency domain, information field and spatial domain four dimensions to cheating signal, take full advantage of the feature of cheating signal on this four dimensions, there is stronger specific aim and the accuracy of Geng Gao, efficiently solve the difficult problem that conventional method is difficult to accurately extract from the background environment of complexity cheating signal, substantially increase the core competence that detecting guides the anti-Ore-controlling Role of cheating blocking system.
Description
Technical field
The present invention relates to a kind of examination hall cheating signal evaluation method, particularly relate to a kind of comprehensive strong, examination hall cheating signal Suspected Degree integrated evaluating method that accuracy is high.
Background technology
Based on detecting guide high-tech practise fraud anti-Ore-controlling Role be current examination hall cheating prevention and control development main flow direction, for this system, how from the examination place radio signal background environment of numerous and complicated, to extract possible cheating signal, and to be blocked be the central factor determining prevention and control validity.
The existing method extracting signal of may practising fraud mainly adopts background signal method of offset, the method learns at the background signal before examination by certain hour, background frequency spectrum data under the environment of acquisition examination hall, in examination process, filter by cancellation algorithms signal of being everlasting, extract the burst of appearance in the test time and be judged as signal of practising fraud.The method only make use of the feature of cheating signal in time-domain upper part, although be simply easy to realize, but shortcoming with only signal burst character in time, not high enough to being extracted in specific aim and accuracy of cheating signal, fail comprehensively to evaluate cheating signal.In addition, also have and adopt black and white lists mode to evaluate cheating signal, but this mode is also only effective to the signal in black and white lists, then lack directive function to signal unknown beyond black and white lists.So acquisition and the evaluation method of existing examination hall cheating signal are all more single, and comprehensive strong not, accuracy is not high enough.
Summary of the invention
Object of the present invention is just to provide to solve the problem a kind of comprehensive strong, examination hall cheating signal Suspected Degree integrated evaluating method that accuracy is high.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of examination hall cheating signal Suspected Degree integrated evaluating method, comprises the following steps:
(1) background signal study: by before examination to the study of examination hall environment, obtain the background signal of examination hall ambient radio environment;
(2) background signal is offset: in examination is carried out, and completes the counteracting based on background signal before examination, the low questionable signal of filtering in time-domain to the wireless signal detected;
(3) simultaneously or timesharing following four category features carried out to the signal after filtering extract:
1. temporal signatures extracts: extract appearance period of signal, frequency of occurrence and signal strength signal intensity;
2. frequency domain character extracts: extract the frequency range of signal, signal madulation mode, signal bandwidth and frequency domain parameter;
3. information field feature extraction: signal receiving is extracted the information source of signal after demodulation and content of text;
4. space domain characteristic is extracted: extract the radiation source information of signal;
(4) Suspected Degree overall merit: in conjunction with black and white lists, scoring is carried out to above-mentioned each category feature and obtain quantized values, quantized values corresponding to four category feature information is again weighted average computation, obtain the comprehensive quantification numerical value of examination hall cheating signal Suspected Degree, this numerical value is larger, cheating signal Suspected Degree is higher, completes the overall merit of examination hall cheating signal Suspected Degree.
Particularly, in above-mentioned steps (3), during temporal signatures extracts, extract following characteristics: in the test period with the signal characteristic that form of bursting occurs, once in a while before examination occur and in examination process frequency of occurrence increase signal characteristic, signal strength signal intensity is better than the signal characteristic of background signal; During frequency domain character extracts, extract following characteristics: the signal characteristic that frequency range or data transmission equipment commonly use frequency range commonly used by intercom, frequency modulation or FSK (frequency shift keying) signal characteristic, the signal characteristic of bandwidth in tens KHz, data transmission equipment commonly uses frequency domain parameter signal characteristic; In information field feature extraction, extract following characteristics: the signal characteristic being different from taxi radio station, there is the signal characteristic with the closely-related content of text of examination; During space domain characteristic is extracted, extract following characteristics: the signal characteristic that radiation source distance examination hall is nearer.
Beneficial effect of the present invention is:
The present invention is by carrying out overall merit from time domain, frequency domain, information field and spatial domain four dimensions to cheating signal, take full advantage of the feature of cheating signal on this four dimensions, there is stronger specific aim and the accuracy of Geng Gao, efficiently solve the difficult problem that conventional method is difficult to accurately extract from the background environment of complexity cheating signal, substantially increase the core competence that detecting guides the anti-Ore-controlling Role of cheating blocking system.
Accompanying drawing explanation
Fig. 1 is the flow chart of examination hall of the present invention cheating signal Suspected Degree integrated evaluating method.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, examination hall cheating signal Suspected Degree integrated evaluating method of the present invention, comprises the following steps:
(1) background signal study: by before examination to the study of examination hall environment, obtain the background signal of examination hall ambient radio environment;
(2) background signal is offset: in examination is carried out, and completes the counteracting based on background signal before examination, the low questionable signal of filtering in time-domain to the wireless signal detected;
(3) simultaneously or timesharing following four category features carried out to the signal after filtering extract:
1. temporal signatures extracts: extract appearance period of signal, frequency of occurrence and signal strength signal intensity; Concrete extraction following characteristics: in the test period with burst form occur signal characteristic, once in a while before examination occur and in examination process frequency of occurrence increase signal characteristic, signal strength signal intensity is better than the signal characteristic of background signal;
2. frequency domain character extracts: extract the frequency range of signal, signal madulation mode, signal bandwidth and frequency domain parameter; Concrete extraction following characteristics: the signal characteristic that frequency range or data transmission equipment commonly use frequency range commonly used by intercom, frequency modulation or fsk signal feature, the signal characteristic of bandwidth in tens KHz, and data transmission equipment commonly uses frequency domain parameter signal characteristic;
3. information field feature extraction: signal receiving is extracted the information source of signal after demodulation and content of text; Concrete extraction following characteristics: the signal characteristic being different from taxi radio station, has the signal characteristic with the closely-related content of text of examination;
4. space domain characteristic is extracted: extract the radiation source information of signal; Concrete extraction following characteristics: the signal characteristic that radiation source distance examination hall is nearer;
(4) Suspected Degree overall merit: in conjunction with black and white lists, scoring is carried out to above-mentioned each category feature and obtain quantized values (numerical value as within 100), quantized values corresponding to four category feature information is again weighted average computation, obtain the comprehensive quantification numerical value of examination hall cheating signal Suspected Degree, this numerical value is larger, cheating signal Suspected Degree is higher, completes the overall merit of examination hall cheating signal Suspected Degree.
Above-described embodiment is preferred embodiment of the present invention; it is not the restriction to technical solution of the present invention; as long as without the technical scheme that creative work can realize on the basis of above-described embodiment, all should be considered as falling within the scope of the rights protection of patent of the present invention.
Claims (1)
1. an examination hall cheating signal Suspected Degree integrated evaluating method, is characterized in that: comprise the following steps:
(1) background signal study: by before examination to the study of examination hall environment, obtain the background signal of examination hall ambient radio environment;
(2) background signal is offset: in examination is carried out, and completes the counteracting based on background signal before examination, the low questionable signal of filtering in time-domain to the wireless signal detected;
(3) simultaneously or timesharing following four category features carried out to the signal after filtering extract:
1. temporal signatures extracts: extract appearance period of signal, frequency of occurrence and signal strength signal intensity;
2. frequency domain character extracts: extract the frequency range of signal, signal madulation mode, signal bandwidth and frequency domain parameter;
3. information field feature extraction: signal receiving is extracted the information source of signal after demodulation and content of text;
4. space domain characteristic is extracted: extract the radiation source information of signal;
(4) Suspected Degree overall merit: in conjunction with black and white lists, scoring is carried out to described four category features and obtain quantized values, quantized values corresponding to four category feature information is again weighted average computation, obtain the comprehensive quantification numerical value of examination hall cheating signal Suspected Degree, this numerical value is larger, cheating signal Suspected Degree is higher, completes the overall merit of examination hall cheating signal Suspected Degree;
In above-mentioned steps (3), during temporal signatures extracts, extract following characteristics: in the test period with burst form occur signal characteristic, once in a while before examination occur and in examination process frequency of occurrence increase signal characteristic, signal strength signal intensity is better than the signal characteristic of background signal; During frequency domain character extracts, extract following characteristics: the signal characteristic that frequency range or data transmission equipment commonly use frequency range commonly used by intercom, frequency modulation or fsk signal feature, the signal characteristic of bandwidth in tens KHz, and data transmission equipment commonly uses frequency domain parameter signal characteristic; In information field feature extraction, extract following characteristics: the signal characteristic being different from taxi radio station, there is the signal characteristic with the closely-related content of text of examination; During space domain characteristic is extracted, extract following characteristics: the signal characteristic that radiation source distance examination hall is nearer.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104437A (en) * | 2011-01-11 | 2011-06-22 | 北京理工大学 | Radio system for preventing cheating on exams |
| CN102710341A (en) * | 2011-04-21 | 2012-10-03 | 北京国瑞维讯科技有限公司 | Ingenious examination room radio cheating counter measure equipment |
| CN203446031U (en) * | 2013-09-05 | 2014-02-19 | 成都和跃科技有限公司 | System capable of detecting and positioning radio exam cheating digital message signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104437A (en) * | 2011-01-11 | 2011-06-22 | 北京理工大学 | Radio system for preventing cheating on exams |
| CN102710341A (en) * | 2011-04-21 | 2012-10-03 | 北京国瑞维讯科技有限公司 | Ingenious examination room radio cheating counter measure equipment |
| CN203446031U (en) * | 2013-09-05 | 2014-02-19 | 成都和跃科技有限公司 | System capable of detecting and positioning radio exam cheating digital message signal |
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Address after: 610041 188 Wuke west two road, Wuhou District, Chengdu, Sichuan (Wuhou new town administrative committee) Patentee after: Chengdu good Antai education Polytron Technologies Inc Address before: 610046 433 Wuxing five road, Wuhou District, Chengdu, Sichuan Patentee before: Chengdu Jiafa Antai Science And Technology Co., Ltd. |