“How Have Ukrainian Drones Defeated Russian Jammers?”
“The commercial drones which make up the bulk of Ukraine’s force operate on known radio frequencies, making them highly vulnerable to jamming. A report by UK thinktank RUSI suggested that Russian electronic warfare took out 90% of Ukraine’s drones in the early stages of the war. Now, however, things seem to have changed, and Russia’s ability to jam drones has been neutralized by smart, but currently mysterious, technology — but this may not be permanent.”
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“However, in the last few weeks things seem to have been changing. We have seen a marked uptick of new drone videos during the counteroffensive, showing small drones directing artillery fire and bombing Russian trenches and vehicles, while small FPV kamikazes appear to be taking out significant numbers of Russian tanks. This is surprising because the counter-offensive means Ukrainian drones have to push ever further into Russian-controlled to carry out their missions.”
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“Jamming is harder to counter, but there are plenty of known techniques from the military world such as the use several antennas to create a highly directional receiver which can screen out jamming. A notch filter blocks out signals which are not precisely those of the controller, reducing the noise produced by jamming. And smart receivers can switch frequency to find one which is not jammed. But we do not know which of these approaches Ukraine uses - if any.”