The jammer is called a “mobile phone jammer” in the United States, and it emits radio waves that prevent the phone from connecting to the network. For the equipment used by the police, children within a radius of 5 meters are hundreds of meters. In France was fined 450 euros. Only prisons and event halls can use radio systems that make cell phones unusable. “(Articles L33-3 and 39-2 of the Postal and Telecommunications Code)
Pierre-Yves Daumas and his company Magnum Telecom, suppliers of about 20 French prisons, have also been delivered to private individuals until they received a warning letter from the National Frequency Agency (ANFR) in December 2007: as the company emailed As the query shows, parents are not the only ones who can easily encrypt. A teacher hopes to “restrict the use of laptops during class (of course it is prudent)”. A university professor said he was tired of having students carry portable pumps during the exam. Other types of customers: clinic operating rooms, doctor’s offices “uncomfortable with customers’ laptops”, pharmacies, construction companies that “want to prevent drivers/operators from being distracted by duty”, sales representatives, he “wanted Keep quiet during the meeting”, a restaurant owner, Bank of Mexico…
The 24 satellites that keep GPS (Global Positioning System) running have a higher reputation than helping you find the nearest gas station. From ground missions to missile systems and more, the military relies on GPS. The military is so addicted to GPS that military personnel and agencies warn that GPS may become a single point of failure risk, and if the system fails, the armed forces will regularly perform exercises without GPS. Civilian life around the world depends more on GPS than we realize.
Although these 24 satellites may fail due to multiple technical reasons, there are concerns that enemy technology may prevent adversaries from accessing GPS. This attack will affect critical applications in civil infrastructure (power and ATM networks rely on GPS) and will severely disrupt military operations. In recent years, a team from the Aerospace Communications Systems Implementation Division has developed BLISS (blind gps jammer signal suppression) technology to intercept jamming signals that may interfere with GPS reception.
Because the power of the GPS signal on the earth is very low, the GPS signal received by the user on the ground is very susceptible to interference. On the battlefield, the enemy can intentionally interfere with GPS to prevent combatants from knowing their location. In China, there are several documented cases in which jammers purchased through the Internet are used to reject location information. In particular, personal protection jammers, although illegal, are still easily available and have been used to bypass GPS tracking technology. “BLISS uses a set of proprietary algorithms to estimate certain properties of high-performance jammers, which can mitigate the effects of various strong jammers,” Dr. Dr. Philip Dafesh (Philip Dafesh), one of the Bliss architects. BLISS can be implemented with existing receivers as an independent device between the GPS receiver and its antenna, or it can be integrated into future receiver chipsets.