High power jammers are widely used
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Simply pushing lots of CW power into the ether is the most inefficient method of jamming and rarely used because of this. More efficient is a tailored jamming system that is modulated in a way that causes problems in the demodulator of the receiver being jammed, usually by using a high peek pulse power at a critical frequency to the receiver demodulation. Even more efficient is to mess with the stages beyond the receiver such as sending valid modulation that mucks up the computer data processing.
Weapons capable of GPS signal jammer or destroying U.S. military and commercial satellites will reach initial operational capability in the next few years, according to a new intelligence report.
The makers of precision-guided munitions no longer take for granted that simple GPS-guidance systems will always work on their own. Jammers and spoofing equipment threaten to populate future battlefields; manufacturers have taken notice and answered the threat.
For example, trackable interference, aka spoofers, likely generate the entire GPS-like constellation and transmit from a common point; thus, these signals generate exogenous constellation-wide delay (i.e., in a bend-pipe versus line-of-sight RF transmission). Other defining characteristics of a malicious interference may include increased energy (i.e., drone jammer), clock drift/offset coloring, inter-satellite interference, etc.
All four satellite navigation systems, the signals of which the Pole-21 must combat, use closely spaced frequencies, which end up in the interval from 1176.45 to 1575.42 MHz. The fact that even a transmitter with an output of a total of 20 watts in order to jam the radio signals in this range in a radius of 80 kilometers attests to the latest Russian system’s capabilities to create an impenetrable jamming dome
South Korean government officials report that the jamming operation, which began in late March, has been targeting aircraft navigation equipment. North Korea has reportedly broadcast a jamming signal on 100 occasions. A total of 962 planes have been affected by the jamming, as well as nearly 700 fishing vessels. The jamming has also affected cell phone base stations.
That’s why the US needs “penetrating” jammers, Bacon said: stealth aircraft that are harder – though hardly impossible – to target and which can slip into enemy airspace to conduct electronic warfare at shorter ranges. GPS denial is a becoming a huge issue for American military planners. Peer states, especially Russia, are already putting GPS spoofing and jamming tactics to work during various training events near their own borders. We have discussed this situation in great depth before, and I would suggest you read this article to understand just how deeply the loss of reliable global positioning system data can mean for the U.S. and its allies during a time of war, as well as what is being done to overcome such a monumental hurdle.