Full-band examination place radio signal shielding device

Abstract

The invention provides a full-band examination place radio signal shielding device. The shielding device comprises a fundamental frequency interference unit and a plurality of jump frequency interference units; a modulation signal generator of the fundamental frequency interference unit is sequentially connected with a modulator, a radio frequency unit and an antenna thereof; a fundamental frequency signal generator is connected with the modulator; each jump frequency interference unit comprises a jump frequency signal generator, a digital frequency converter, a radio frequency unit and an antenna thereof which are sequentially connected; and all the digital frequency converters are sequentially connected, and the digital frequency converter of the first path is connected with the modulator in the front. The fundamental frequency source provides a low-end interference signal source, and signals of different bands are acquired by jump difference frequency, so that shielding of all available bands is realized. Aiming at the mode and the technical condition of current radio communication, the shielding device can implement all-directional, full-band and seamless carpet covered interference shielding of bands in a range of 50 to 2,500MHz.

Description

[0001] technical field [0002] The invention relates to a wireless interference device, in particular to a device used in an examination room to interfere with wireless communication equipment in all frequency bands, and is used to prevent cheating by using the wireless communication equipment. Background technique [0003] With the development of science and technology, the means of using wireless devices to cheat in the examination room are gradually increasing. However, the main method is to use wireless signals to cheat. In summary, there are mainly the following methods: [0004] One is to cheat through mobile phone signals, that is, to use several channels such as SMS, voice, and data services to send the answer to the cheater's mobile phone, and then send it to the cheater through an invisible earphone. The method of cheating using mobile phone text messages appeared first, but in recent years, with the development of anti-cheating work in exams, especially the ins...

AI Technical Summary

Problems solved by technology

[0005]The second is to use special frequency band radio technology to directly send the answer to the receiving device on the cheater. This method is more difficult to shield, because the transmission frequency can be any frequency , or even frequency hopping transmission, the current common multi-channel test room jammers cannot effectively shield such cheaters

However, cheating methods are constantly being refurbished, especially the frequency of cheating devices is constantly changing in a wide range, making it difficult for existing shielding devices to adapt, and cheating is still repeated.

The defect of the existing jammer is that the interference frequency is single, the interference method is single, and the function of the existing jammer is greatly reduced due to the lack of equipment.

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