Saulius Rudys, Paulius Ragulis, Rimvydas Aleksiejunas
Recently, Unmanned Aerial Vehicles (UAVs) have been used to interrupt the operations of airports and other critical infrastructure using GNSS signals. To neutralise these hostile UAVs, jamming radiation on the GNSS frequency band is used, but this neutralisation method is potentially dangerous for manned aircraft and also interrupts nearby GNSS users. This new concept proposes a method of very selective GNSS jamming. The idea exploits non-linear effects in the semiconductor elements of electronic circuits. Combined frequencies (including GNSS) are generated when semiconductors in a UAV‘s electronic equipment are affected by a strong narrowbeam microwave signal comprising at least two frequencies. With no jamming radiation on GNSS frequency, this concept is safe for manned aircrafts and can be used in airports. There is spatial selective GNSS jamming, which means that the energy of higher frequency radiation can be focused into a much narrower beam. Moreover, the additional hostile UAV‘s communication jamming is in different frequency bands.