Mobile phone signal shielding device first appeared in the late last century, on the market at the time such products are sold to more oil and petrochemical enterprises, in order to avoid the phone switched on when the danger caused by spark. Later, it gradually turned to theaters, examination halls, libraries and other places that need to prevent cell phone interference and keep quiet.
The US military has declined to confirm whether any of their drones have crashed as a result of the Russian cell phone jammer citing operational security. Despite US drones being equipped with anti-jamming technology, NBC quoted US officials stating that Russian disruption technology was “very sophisticated, proving effective even against some encrypted signals and anti-jamming receivers.” The Russians began jamming some smaller U.S. drones several weeks ago, the officials said, after a series of suspected chemical weapons attacks on civilians in rebel-held eastern Ghouta. The Russian military was concerned the U.S. military would retaliate for the attacks and began jamming the GPS systems of drones operating in the area, the officials explained.
On the working principle of the equipment, there are such professional description: “the operation principle of the mobile phone is in a certain frequency range, mobile phone and base station connected by radio waves, in a certain way of baud rate and modulation complete data and voice transmission. For this communication principle, the cell phone mask is at a certain speed to the low end of the channel to the high-end scan. The speed of the scan can be used to signal interference in the receiver’s message, so the phone can’t detect the normal data from the base station, and it can’t establish a connection with the base station.
At a March 11 soccer game in Wuhan, China, police faced a new kind of threat: drones trespassing near the stadium. Their response was to use a new kind of weapon: an anti-signal jammer that jammed the control signals, forcing the trespassing drones to land automatically. Given China’s role as a global leader in consumer drone and military unmanned aircraft systems (UAS) exports, it only makes sense that China is also developing a range of anti-drone capabilities to stop unauthorized or hostile flying robots from coming over sensitive or vulnerable sites. In the case of Wuhan, the jammer “guns”—known as such not just because they “shoot” but also because they look like an assault rifle—cost approximately $19,000, and can reportedly jam control signals up to a kilometer away (though that figure assumes that the user has exceptional aim). Impressed with its capabilities, Wuhan police intend to buy more.Since the GPS system originated in the United States, the positioning system could pose a threat to other countries’ security. If the problem with GPS signals in the kremlin and around the world is not an accident, it is a sign that Moscow has taken steps to address the security of the system.