How to determine the range of interfering devices
The interference power of the shield is certain, and the shield radius of the non-blocking space is determined by the attenuation of the path and the signal level of the receiving base station. In mobile networks to realize signal jammers for mobile phones, the electric field strength gps blocker is larger than the implementation of the electric field strength mobile signal interference region, and the closer to the base station, the stronger the electric field strength. Must be. Conversely, the effective interference area is small, and the farther away from the base station location, the weaker the electric field strength and the larger the effective interference area.
The Army has pointed out newly developed algorithms (such as Multiple Signal Classification (MUSIC)) that allow missiles to detect and locate mobile phone signal jammer. These algorithms focus on the unique characteristics of the jammer. "For example, traceable interference, also known as Spuffer, can generate an entire constellation like GPS and send it from a common point. Therefore, these signals delay the entire extrinsic constellation. (That is, with bend pipes and RF transmissions in line of sight). Other distinct features of malicious interference include increased energy (ie, jammers), clock drift / offset coloring, and inter-satellite. Interference etc. may be included. "
Why the jammer works
Norwegian military intelligence director Morten Haga Lunde confirmed in an interview about Aftenposten Russia's obstruction at Zapad-2017. «Electronic warfare with GPS disturbances. Perhaps this obstruction was intended to obstruct the use of GPS by Russia's own army. However, the side effects affected Widerøe and intercontinental flights, which Russia was supposed to come to. »In Finnmark, Wideroe, a regional jet, operates daily commercial flights to 11 airports, with SAS serving Alta and Kirkenes.
Why do wireless signal jammers interfere with the normal use of the phone? Mobile phones work by sending and receiving radio waves. The frequency of the phone is about 1.8GHz. To interfere with mobile phone signals, you need a device that emits radio waves of the same frequency. Mobile phone signal jammers are such devices, blocking mobile phone signals within scope, and the degree of light has a serious impact on the quality of calls and the internet. Within a radius of 25 meters, the phone is usually heavily disturbed by a jammer. The effective range of 25 meters is also less affected. The range of jammers also depends on the specific performance and power of each jammer.
In today's excessive media, the influence of the developed telecommunications network is influenced by the bow clan brush weibo's letter, not only in college classrooms such as conferences, but also in the order of reunions of various social daily activities. .. In the classroom, teachers and students must reach an agreement that instruction orders should not be revoked, and it is clear that students playing on mobile phones are illegal.
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