The concern comes as civilian aviation and communications systems have repeatedly been signal jammer in connection with nearby Russian military activities.
The situation was similarly serious in September 2017, when airliners from companies SAS and Widerøe in periods had to navigate with the help of radio signals due to loss of GPS when they entered the East Finnmark airspace. The jamming coincided with the major Russian military exercise «Zapad».
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 cell phone jammer the GPS systems of drones operating in the area, the officials explained.
Jamming, which means blocking or scrambling a drone’s reception of a signal from a GPS satellite, can be uncomplicated, according to Dr. Todd Humphreys, the director of the Radionavigation Laboratory at the University of Texas at Austin.
Jamming is defined as “the emission of radio frequency with enough power and with the features needed to prevent, in a given area, the receivers to track GPS signals”
The low power that GPS signals arrives to the receivers allows the power of the jammer to be effective even at very low power levels, making interference in GPS relatively simple and inexpensive to carry out. Various jamming methods are available in the market, being possible to find very efficient ones for $ 1,000.00, which are capable of delivering at least 100 watts (Rrol 2003).
When evaluating the influence of a jammer on a receiver, one should use the J/S relationship (jamming/signal). When expressed in dB, it is the difference between the power of the interfering signal and power of the received one.
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