According to the upstream and downstream channels of the mobile phone system, the shielding frequency of 4G jammer is analyzed by using the techniques of frequency doubling, frequency division and frequency hopping filtering.According to the power size of the shielding device, a spherical shielding space is customized to automatically form a shielding magnetic field within the specified range, making mobile phones fail in this space.
As it stands now the Navy’s principal airborne electronic attack systems relies on technology developed in the 1970’s: While the service has switched from the old EA-6B Prowler to the new EA-18G Growler as its electronic attack aircraft, the actual radar-jamming systems on the aircraft are largely the same. Service leaders are worried that with rapid advances by China and Russia in electromagnetic warfare will put their pilots at a major disadvantage, sooner rather than later.
None of this is particularly noteworthy. Electronic-warfare aircraft, such as the EA-18G, have become a fixture of aerial warfare since World War II. signal jammer radars, missile-guidance systems and communications networks has become par for the course. For that matter, the Pentagon worries about Russian and Chinese capabilities to jam or spoof GPS links that are key to accurate navigation and targeting.
U.S. analysts first caught the Russian military drone jammer drones in eastern Ukraine four years ago, after the invasion of Crimea, according to Humphreys. He said the jammers were initially detected as faint signals from space, bouncing off the earth’s surface. The jammers “had a pretty significant impact” on the United Nations surveillance drones that were attempting to monitor the area, grounding the fleet for days and halting intelligence gathering from the air.