A method for detecting and identifying a powered-on mobile phone in an examination room
A mobile phone and examination room technology, which is applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of low positioning accuracy, difficult implementation, and huge system, and achieve high accuracy and high positioning accuracy.
Active Publication Date: 2016-02-17
XIAMEN UNIV
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Problems solved by technology
[0004] Existing examination room monitoring systems and wireless signal positioning algorithms often have problems such as large and complex systems, difficult implementation in the examination room environment, and low positioning accuracy.
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Embodiment Construction
[0029] Embodiments of the present invention are given below to further illustrate the present invention.
[0030] A method for detecting and identifying a mobile phone in an examination room described in this embodiment includes the following specific steps:
[0031] 1) Dispersely place M sensors within the scope of the examination room, and record their position coordinates, assuming that the i-th sensor is placed at the coordinates of (x i ,y i ), where i=1,2,3,...M. The number of sensors arranged in this step can be as many as possible to improve the recognition accuracy, and it can also cover the entire examination range;
[0032] 2) Through the previous system training, initialize the detection and identification system monitoring threshold value of the mobile phone in the examination room: the inspection threshold α of the received signal strength monitoring;
[0033] 3) When there is no mobile phone in the current examination room, the arranged M sensors measure the ...
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The invention discloses a method for detecting and recognizing activated mobile phones in an examination room and relates to detection and recognition of mobile phone signals. The method includes the steps that first, sensors are arranged in the examination room; second, the monitoring threshold of the intensity of received signals of a system is initialized; third, the surrounding wireless spectrum intensity measured by the sensors when no mobile phone is activated serves as the reference value of the initial received signal intensity vector; fourth, the surrounding wireless spectrum intensity is monitored by the sensors in real time; fifth, the test statistics L(u) is calculated through the and the ; sixth, if the L(u) is larger the test threshold of monitoring of the intensity of the received signals, an alarm indicating that an activated mobile phone exists is given; seventh, the position of the activated mobile phone is obtained through calculation according to a weight average algorithm by means of the measured and the coordinates of the sensors; eighth, if an alarm indicating that an activated mobile phone exists in the examination room is not given in the sixth step, the reference vector of the intensity of the received signals are updated for the sensors, the current vector of the intensity of the received signals is used as a new reference vector of the intensity of the received signals, = , and the fourth step is executed again.
Description
technical field [0001] The invention belongs to the technical field of radio monitoring and relates to the detection and identification of mobile phone signals, in particular to a method for detecting and identifying a mobile phone that is turned on in an examination room. Background technique [0002] With the rapid development of wireless communication technology, mobile phone communication has become an indispensable part of people's daily life. However, the use of mobile phones to cheat in the examination room is also becoming more and more rampant. At present, the method of dealing with cheating by using mobile phones is usually discovered and processed by the invigilator system consisting of the invigilator and the invigilator camera on the one hand, and on the other hand [Han Fei, Liao Huafen, Tu Jingsheng. A full-band examination room wireless signal shielding Device [P].CN102594483A.2012-07-18] adopts wireless signal shielding and wireless signal interference so th...
Claims
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IPC IPC(8): H04B17/00
Inventor 肖亮李强达陈桂权黄联芬唐余亮
Owner XIAMEN UNIV