Study On Cheating On The Use Of Radio And Counter Measures

This paper has made an exploration and summary about cheat in examination using radio,through studying several major examination frauds in recent years. In this paper, using the radio tocheat has been analysed theoretically, and the actual cheating process has been studied. Theadvantages and disadvantages of cheating by radio voice and digital data have been givenrespectively. This paper puts forward two counter-measures, radio targeted suppressingcounter-measure and radio locating counter-measures. After discussion about study of radiocheating and countrer-measure methods, the counter-measures method can solve the problem ofusing radio to cheat at the present, and provides a new train of thought for later.The main content of this paper is as follows:(1) The radio electromagnetic wave propagation theory has been summarized. According tothe characteristics of electromagnetic wave propagation in the air, the receiving equipment has beenused to monitor radio electromagnetic environment around the examination room. The signalfrequency, phase and duration characteristics have been analyzed, and then determine the radiosignals cheating is expounded.(2) The principle of electronic countermeasures has been given in detail. As a template ofCSCC suppression system, the counter-measures has been presented after finding the radio cheatingsignals. The means have also been given to ensure the valid of the counter-measures in practice.(3) The counter-measure of radio direction-finding location technology is the most effectivetechnical means of fighting against cheating gangs using radio. In this paper, the current directionfinding technologies have been studie, such as amplitude, phase direction finding technology, thedifference of time delay of direction finding technology, doppler direction finding technology. Then,this paper introduces several kinds of positioning methods. Finally, Huari car of radio monitoringand direction finding, PR100portable spectrometer, IC100portable receiver equipment have beenas reference devices. This paper introduces how to effectively counter radio cheating using locatingmethod of direction finding and hit cheating gangs and arrest them.