Why in the world is there so much jamming in Turkey? What's going on?
Turkey has been jamming GPS for years. I can't find a good explanation.
Flightradar24's new GPS jamming map
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Re: Flightradar24's new GPS jamming map
#52I wonder why there's some jamming near a small section of the Texas/Mexico border?
You're not the only person: https://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Liu_... TL;DR: It's weak signal, not jamming. The weak signal reports come from military training aircraft carrying out maneuvers that cause temporary signal loss.
really? unless they're jamming it, how would that happen?
Re: Flightradar24's new GPS jamming map
#53I wonder why there's some jamming near a small section of the Texas/Mexico border?
You're not the only person: https://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Liu_... TL;DR: It's weak signal, not jamming. The weak signal reports come from military training aircraft carrying out maneuvers that cause temporary signal loss.
Yep, this map doesn't show jamming. It shows weak signals, of which jamming is one potential cause. An airplane pointing their GPS receiver at the ground will also cause a weak signal.
Re: Flightradar24's new GPS jamming map
#54The data is taken from aircraft [EDIT: not airlines; see traceroute66's comment], so it doesn't give full coverage of the world, but it does include other satellite navigation systems aside from just GPS. Looks like the jammed/interfered areas are: * A large part of Eastern Europe around Ukraine is missing data, and there are many jammed/interfered areas around it, including the southern coast of the Black Sea and pa…
> The data is taken from airlines
No. It is not.
The data is ADS-B data which is broadcast by aircraft.
FR24 (and other similar services) obtain the data via a community[1], you can take part too[2].
For certain parts of the world, they may have the option to augment the data via commercial services, but that is highly unlikely to be on a global basis.
Conclusion: Missing coverage means no community coverage in that area and no commercial augmentation.
[1] https://www.flightradar24.com/blog/how-we-track-flights-with... [2] https://www.flightradar24.com/apply-for-receiver/
Re: Flightradar24's new GPS jamming map
#55Why in the world is there so much jamming in Turkey? What's going on?
To the north is the Black Sea, and the Russia-Ukraine war. To the east is Armenia and Azerbaijan (as well as Iran). To the south is the middle east. Also Cyprus with the frozen conflict, there.
Re: Flightradar24's new GPS jamming map
#56Re: Flightradar24's new GPS jamming map
#57Earlier quoted context omitted.
You're not the only person: https://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Liu_... TL;DR: It's weak signal, not jamming. The weak signal reports come from military training aircraft carrying out maneuvers that cause temporary signal loss.
Yep, this map doesn't show jamming. It shows weak signals, of which jamming is one potential cause. An airplane pointing their GPS receiver at the ground will also cause a weak signal.
How does an airplane "point their GPS receiver at the ground" (for an extended period of time since a combined GNSS/INS positioning solution, which is what all airliners use at this point as far as I know, will need an extended signal loss to report decreased accuracy)?
Re: Flightradar24's new GPS jamming map
#58Earlier quoted context omitted.
I don't live in that country though
> I don't live in that country though Exactly. You don't live there. Not many people live in the Australian desert. Conclusion: No data or very limited data
"No data" cells are grey on that map, but western Australia has a couple of red ("high interference") cells.
Re: Flightradar24's new GPS jamming map
#59Earlier quoted context omitted.
You're not the only person: https://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Liu_... TL;DR: It's weak signal, not jamming. The weak signal reports come from military training aircraft carrying out maneuvers that cause temporary signal loss.
really? unless they're jamming it, how would that happen?
[deleted]
Re: Flightradar24's new GPS jamming map
#60It's kind of neat how this works: > As part of the ADS-B messages we receive from each aircraft, the Navigation integrity category (NIC) encodes the quality and consistency of navigational data received by the aircraft. The NIC value informs how certain the aircraft is of its position by providing a radius of uncertainty. > Poor NIC values alone might indicate a problem with an aircraft’s equipment or unfavorable pos…
> A single observer can't really say for certain that jamming is happening; you need a distributed sample from multiple different sensors over a period of time to have reasonably high confidence. Could you use RTLSDR triangulation to hone in on granular lat long of jamming sources? https://www.rtl-sdr.com/detecting-gps-jammers-in-augmented-r... https://www.rtl-sdr.com/kiwisdr-tdoa-direction-finding-now-f...
You can get rough areas with a GPS and a RTLSDR and a bunch of samples (either over time OR with lots of people with the same device)
But to get fine granular data, you need a timestamping SDR. (each parcel of signal data for a quantum of data needs an exact time down to 6-8 significant figures, basically GPS timebase).
Most your cheaper SDRs cant do that.
Stuff like the BladeRF and higher do provide timestamped data.