Since nobody’s asked: How does GPS jamming work?
Also - what's the point nowadays when you got at least 3 more constellations + jam-proof (?) GPS2?
GPSJam: Daily Maps of GPS Interference
41–50 of 86 posts
Re: GPSJam: Daily Maps of GPS Interference
#42Earlier quoted context omitted.
Basic jamming: Transmit a strong signal on the main GPS frequency (1575.42 MHz). Receivers get saturated and can't hear the real signal. Medium Jamming: Transmit the signal that a receiver would receive at a specific location loudly. GPS receivers will lock onto that signal, and report they are at the location you choose, rather than the real location they're at. Advanced Jamming: Pick a target, such as a VIP plane.…
Was the drone not using the encrypted variant of GPS?
IIRC there was speculation Russia helped to decrypt it?
Re: GPSJam: Daily Maps of GPS Interference
#43Curious, how do you measure your own gps “accuracy”? Also, is “jamming” a precision reduction (seems improbable given how I think gps works) or a signal strength reduction in this case?
> how do you measure your own gps “accuracy”? Because GPS is way cool. First, there is the official site: https://www.gps.gov/systems/gps/performance/accuracy/ I am far from being an expert, but being a flying nerd, that's what I can tell you: The more satellites in sight you have access to, the cooler stuff you can do with GPS. Minimum to establish 2D (on globe projection 2D) location is 3 sats, minimum for altitude…
Friend of mine is doing ocean bottom surveys. He uses pretty decent GPS receiver, but also gets real-time (or applies it later) "correction" data from ground based stations that calculate error caused by atmosphere, which gets him down to 1cm accuracy.
Re: GPSJam: Daily Maps of GPS Interference
#44There was a spot I stood on in Japan probably 20 years ago that made my (handheld Garmin) GPS think I was traveling at something like 700mph at some angle across the globe. Once I left the area by maybe 10 feet, everything returned to normal. Went back to the spot, same thing. Always wondered what caused that.
Re: GPSJam: Daily Maps of GPS Interference
#45Earlier quoted context omitted.
Would it sound similar like saying hurricane about to hit Cuba, Florida and Dominican Republic. This does not imply that Florida is a country is just more precise location definition than saying USA. Same here with Kaliningrad as part of Russia.
Florida is a state, Kaliningrad isn't even an autonomous oblast.
It kinda is oblast : https://en.wikipedia.org/wiki/Kaliningrad_Oblast
Re: GPSJam: Daily Maps of GPS Interference
#46Earlier quoted context omitted.
I know the stories behind some of the regions, or at least some hypotheses. Interference in the U.S. is almost always the result of military testing or training. If you check against another map (Google maps, or skyvector.com/globe.adsbexchange.com to see sectional charts) you'll see that the interference region is usually centered on or close to a military base or Military Operations Area. There are often FAA notice…
I zoomed in on a red spot in the US and was surprised to see the city name "Uvalde" pop up. Not quite in the center of the spot, but any thoughts on if it might be related to the reason that a European like me knows that name?
From what I've read in the newspapers, Uvalde is the home of a big Customs and Border Peotection headquarters, which is a federal sorta-military operation. That's why so many CBP officers responded to the school shooting.
Speculation on my part, but it coincides with the fact that most jamming in the U.S. is near military facilities.
Re: GPSJam: Daily Maps of GPS Interference
#47Since nobody’s asked: How does GPS jamming work?
Basic jamming: Transmit a strong signal on the main GPS frequency (1575.42 MHz). Receivers get saturated and can't hear the real signal. Medium Jamming: Transmit the signal that a receiver would receive at a specific location loudly. GPS receivers will lock onto that signal, and report they are at the location you choose, rather than the real location they're at. Advanced Jamming: Pick a target, such as a VIP plane.…
Synchronous and Asynchronous GPS Spoofing are the correct terms to use
Re: GPSJam: Daily Maps of GPS Interference
#48Earlier quoted context omitted.
Basic jamming: Transmit a strong signal on the main GPS frequency (1575.42 MHz). Receivers get saturated and can't hear the real signal. Medium Jamming: Transmit the signal that a receiver would receive at a specific location loudly. GPS receivers will lock onto that signal, and report they are at the location you choose, rather than the real location they're at. Advanced Jamming: Pick a target, such as a VIP plane.…
Was the drone not using the encrypted variant of GPS?
It is alleged that the RQ-170 was expressly designed for risky operations (where loosing it eventually is likely, and retrieval/destruction may not be possible) and so was created without sensitive technology.
Re: GPSJam: Daily Maps of GPS Interference
#49Earlier quoted context omitted.
Perhaps they are jamming GPS and Galileo in favor of Glonass. They are certainly concerned about US GPS-powered artillery like the HIMARS given to Ukraine. They’d need fairly precise jammers because the frequencies are only 50MHz apart (GLONASS uses a frequency of 1.602 GHz, whereas GPS uses 1.57542 GHz).
You are underestimating how vast Russia (and Ukraine) are. Moscow is out of reach even for the longest range (300km) HIMARS missiles which are not supplied to the Ukraine. GPS jamming protects Russia's command and control structures from American intermediate range cruise missiles that can be launched from Mk41 launchers in Romania and Poland as well as from American ships.
> GPS jamming protects Russia's command and control structures from American intermediate range cruise missiles that can be launched from Mk41 launchers in Romania and Poland
I don't think Mk41 are operating in these two countries.[0] They do have Aegis Ashore [1] though which is an anti-ballistic defense system. AA uses SM-3 missiles that in theory could reach Moscow though.
[0] https://en.wikipedia.org/wiki/Mark_41_Vertical_Launching_Sys...
[1] https://en.wikipedia.org/wiki/Aegis_Ballistic_Missile_Defens...
Re: GPSJam: Daily Maps of GPS Interference
#50Earlier quoted context omitted.
Was the drone not using the encrypted variant of GPS?
It is alleged that the RQ-170 was expressly designed for risky operations (where loosing it eventually is likely, and retrieval/destruction may not be possible) and so was created without sensitive technology.
The crypto for US military GPS uses the same keys worldwide, and rotated ~ weekly. That means if you capture any device which has the crypto keys, then you can spoof military GPS for the rest of the week, allowing you to do lots more damage.
Therefore, the military often doesn't even use the keys in their own devices.