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Flightradar24's new GPS jamming map

flightradar24.com

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Re: Flightradar24's new GPS jamming map

#101

Post by rllearneratwork »

wongarsu wrote: post #21
tivert wrote: post #9

So how should I interpret this? The map lacks geopolitical boundaries, so it's hard to interpret. There looks like a big hole of no data over Ukraine, where I'd most expect GPS jamming, but I suppose there are no civilian flights either. Maybe they could setup an GPS observation station on the ground at a surveyed point to get data there. There's a big red blob over Turkey, is that maybe the southern edge of the reac…

The hole over Ukraine is definitely the lack of civilian flights. Another notable spot is Kaliningrad, the Russian exclave. It looks relatively normal on some days, like today, but on others like yesterday it's covered by solid red stretching far into Poland, Sweden and even Germany.

[flagged]

Re: Flightradar24's new GPS jamming map

#102

Post by AdamH12113 »

traceroute66 wrote: post #54
AdamH12113 wrote: post #47

The 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…

I corrected my comment. Thanks!

Re: Flightradar24's new GPS jamming map

#103

Post by CrzyLngPwd »

rllearneratwork wrote: post #101
wongarsu wrote: post #21

Earlier quoted context omitted.

The hole over Ukraine is definitely the lack of civilian flights. Another notable spot is Kaliningrad, the Russian exclave. It looks relatively normal on some days, like today, but on others like yesterday it's covered by solid red stretching far into Poland, Sweden and even Germany.

[flagged]

Earth is temporarily occupied by humans, too.

Re: Flightradar24's new GPS jamming map

#104

Post by kube-system »

adolph wrote: post #91
gregmac wrote: post #11

It'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…

Do aircraft systems really only use GPS and not the full constellation of navigational satellite systems? Besides GPS, the GNSS currently includes other satellite navigation systems, such as the Russian GLONASS, and may soon include others such as the European Union’s Galileo and China’s Beidou. https://www.terrisgps.com/gnss-gps-differences-explained/

It doesn't matter too much, aircraft don't rely solely on any GNSS for navigation, because they're all susceptible to similar availability issues. Magnetic, inertial, barometric, and land-based radio systems are also used. One or more of those other systems are used as a fallback when GNSS fails.

Re: Flightradar24's new GPS jamming map

#105

Post by eternauta3k »

rllearneratwork wrote: post #101
wongarsu wrote: post #21

Earlier quoted context omitted.

The hole over Ukraine is definitely the lack of civilian flights. Another notable spot is Kaliningrad, the Russian exclave. It looks relatively normal on some days, like today, but on others like yesterday it's covered by solid red stretching far into Poland, Sweden and even Germany.

[flagged]

Correct me if I'm wrong, but AFAIK Germany is the one country where even far right parties don't want to touch the topic of old territorial claims.

Re: Flightradar24's new GPS jamming map

#106

Post by trollian »

lxgr wrote: post #81
traceroute66 wrote: post #74

Earlier quoted context omitted.

> but western Australia has a couple of red ("high interference") cells. Erm mate, have you tried looking at different days ? Those cells you find so suspicious in Australia are not there on other days ! Seriously, given the largely community-based nature of FR24 data I would not expect too much in term of accuracy.

> Erm mate, have you tried looking at different days ? Those cells you find so suspicious in Australia are not there on other days ! That kind of disproves the "no data" hypothesis though, no? One explanation could be they have a simplistic algorithm like "if uncertainty > (something indicating more than 5 minutes of GNSS-to-INS fallback) on more than 50% of all flights of a day", and there's only one flight per day…

I thought it might have been Square Kilometer Array interference but that's to the north of those spots.

Re: Flightradar24's new GPS jamming map

#107

Post by elzbardico »

rllearneratwork wrote: post #101
wongarsu wrote: post #21

Earlier quoted context omitted.

The hole over Ukraine is definitely the lack of civilian flights. Another notable spot is Kaliningrad, the Russian exclave. It looks relatively normal on some days, like today, but on others like yesterday it's covered by solid red stretching far into Poland, Sweden and even Germany.

[flagged]

[flagged]

Re: Flightradar24's new GPS jamming map

#109

Post by eternauta3k »

jcrawfordor wrote: post #75
barryrandall wrote: post #61

Earlier quoted context omitted.

Rapidly execute a series of maneuvers (flips, rolls) that cause the radios to lose signal.

So I'm a little skeptical on that front because military aircraft are still not that often broadcasting ADSB even during routine flights, at least in my (also close to the border) region. In theory the Air Force was supposed to have completed ADSB installation on their fleet last year but they blew the deadline pretty bad on even installing transponders, and of course they still reserve the right to disable them duri…

How does not having ADSB impact air control?

Re: Flightradar24's new GPS jamming map

#110

Post by toomuchtodo »

mNovak wrote: post #100
toomuchtodo wrote: post #44

Earlier quoted context omitted.

> 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...

With synchronized receivers you could do some rudimentary direction finding. Note that synchronizing SDRs is much more achievable if they're physically nearby (e.g. can run a cable between them for a common clock) vs if they're physically distant observers (can't exactly use GPS time for synchronization if you're measuring GPS interference)

Very helpful (as well as sibling comment by pierat). Thank you both. I will need to do some research with regards to pairing SDRs with local disciplined clock that can tolerate temporary loss of remote (stratum-0,1) time precision.

https://en.wikipedia.org/wiki/GPS_disciplined_oscillator

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