Military Uses of Signal jamming device
Most jammers are designed for military purposes. For example, they can be used to confuse the enemy and prevent them from accurately locating their own position, or to interfere with the accurate landing point of GPS-guided missiles or bombs. Such devices play a vital role in war and can effectively protect their own troops and resources.
Civilian Uses of Signal jamming device
While jamming GPS signals is vital in the military, it also has some important civilian uses. For example, when you are worried about being tracked by a GPS receiver, you can use a jammer to hide your location or the whereabouts of your vehicle. Recently, jammers have been increasingly used in the civilian field, including preventing cheating in exams and maintaining a quiet environment in certain public places.
Anti-cheating in exams
Recently, four famous universities, including Kyoto University, have had cheating incidents in their entrance exams, which has put mobile phone jammers in the spotlight. These schools tried to use 5G signal jammers to prevent students from using their phones during exams so that they can concentrate. However, the legality of this practice has been questioned, and the school has confirmed the relevant matters to the FCC. As Principal John Hook said: "We just want to recognize this."
Other application scenarios
The application of jammers is not limited to exam anti-cheating. Such devices are able to transmit radio signals in the 800MHz frequency band, which is the main carrier frequency band of NTT Docomo and KDDI au mobile phones. In addition, there are jammer products for other frequency bands. At present, the main users of jammers include operators of hospitals, concert halls and cinemas, which need to be quiet at certain times. In addition, some banks have also installed jammers in ATMs to prevent "ore" fraud.
Social impact of jammers
David Last, Emeritus Professor of Bangor University in the UK, pointed out: "GPS is closely related to our transportation, manufacturing and economy, and its interference may bring high risks." He emphasized the potential harm of GPS jammers used in crimes. However, mobile jammer devices are gradually becoming civilian products, not just electronic warfare equipment. This is because, as the number of mobile phone users increases, the need to ban mobile phones in certain places is also growing.
Jammers are becoming more and more common in certain public places, such as places of worship, university lecture halls, libraries, concert halls and conference rooms where quiet environments are required. In these places, mobile phone ringing may disrupt order, so banning mobile phones has become a need. By using jammers, the quiet environment of these places can be effectively maintained to ensure the smooth progress of activities.