Research on uav jammers in various countries
Based on future potential adversarial capabilities and the need for training in a denied, degraded, disrupted space operational environment, SMDC/ARSTRAT was tasked by Headquarters, Department of the Army, to determine appropriate training systems to support this requirement. One of these systems, the Direct Injection GPS signal jammer, was selected as a possible candidate.
The Russian army has established a ground-based unit specializing in defeating enemy drones. The unit—the first of its kind in Russia—operates electronic jamming systems that, in theory, can sever the radio connections between unmanned aerial vehicles and their operators.
Iran acquired older Avtobaza jammers from Russia. An Iranian Avtobaza reportedly was instrumental in Tehran’s carefully-coordinated effort to force down a US Air Force RQ-170 stealth drone on the Iran-Afghanistan border in December 2011.
The Russians began wifi signal jammer 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.
Most digital communications systems need a synchronization military to be transmitted between the communicating devices. Jamming can be concentrated on the synchronization military, which will nullify the effectiveness of the entire transmission system. Synchronized systems are very susceptible to jamming. Once the synchronization is lost, the jammer stops its transmission and jammer can only be restarted after resynchronization is achieved. It is usually very difficult for the jamming system to know when the synchronization is lost and hence, difficult to restart the jammer. The objective is to incorporating military interference into the communications frequency so that the military devices are completely submerged by the interference. Waveforms useful for jamming include noise-modulated FM, noise bursts, CW tones (spot jamming), and swept military (swept-spot jamming).