Need to get some more Helium hotspots proving location with proof of coverage and then people wouldn't have to rely on government controlled GPS.
Flightradar24's new GPS jamming map
181–190 of 299 posts
Re: Flightradar24's new GPS jamming map
#182Earlier quoted context omitted.
Who is jamming around Tallinn area? Also is GPSIII just as susceptible to jamming? Hawkeye + SAR data would be pretty interesting for ship tracking. I think I've seen some papers here before, but nothing interactive like your site. I think open SAR data is not quite realtime yet, but hope soon is.
Search and Rescue data? How does that help here? And is there a repository of SAR rescues somewhere?
Think it's Synthetic Aperture RADAR.
Re: Flightradar24's new GPS jamming map
#183If anyone found the above interesting, I wrote a short article mapping plane activity on FlightRadar's 'blocked' list (i.e FlightRadar had agreed to remove the ADBS data from their dataset following probable legal pressure). https://dfworks.xyz/blog/hnwi-osint-private-jet/ Slightly tangential so feel free to remove if irrelevant
That's LADD (Limited Aircraft Data Displayed), which requires that aircraft marked as such in the FAA's database to be removed from the official data feeds used by the commercial flight radar sites.
Crowdsourced data isn't subject to LADD, so adsbexchange and other such sites can and do display such aircraft.
For flights within the US, there's also a private address program that allows an ADS-B equipped plane to broadcast an alternate address.
https://www.faa.gov/air_traffic/technology/equipadsb/privacy
Re: Flightradar24's new GPS jamming map
#184Earlier quoted context omitted.
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/
The linked page already says that it reports on the constellation, not just GPS: "The map uses are color coded overlay to indicate low (green) to high (red) levels of interference with global navigation satellite systems (GNSS). Often just referred to as GPS, there are actually multiple systems beside the US GPS constellation, such as Russia’s GLONASS, Europe’s Galileo, China’s BeiDou, and others."
Just came here to wonder who came up with the beautiful name of CLOWNASS... er, I mean GLONASS.
Re: Flightradar24's new GPS jamming map
#185Earlier quoted context omitted.
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)?
Probably something like this https://youtu.be/Ynvoriv09Ks?t=105
on a pure radar scan, what would return of formation flying like this look like to a radar operator? is it just one large dot, or can they distinguish the number of planes in the formation?
Re: Flightradar24's new GPS jamming map
#186What's the deal with a large chunk of Turkey's northern coast being jammed?
Re: Flightradar24's new GPS jamming map
#187Earlier quoted context omitted.
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)
> can't exactly use GPS time for synchronization if you're measuring GPS interference Can other GNSSes (Galileo/BeiDou/GLONASS/etc) give usable timestamps? Seems like it'd be tricky for a jammer to target all of them simultaneously. (Of course, since they'd be on a different band, unless your SDR is wideband enough you'd need two RX heads which gives you potential issues with phase drift between the tuning VCOs even…
>> Can other GNSS give usable timestamps? Seems like it'd be tricky for a jammer to target all of them
Actually the opposite; GNSS systems are all purposely designed to operate at virtually the same frequency (check out this figure [1]) while cleverly not interfering with each other. There are sub-bands within each constellation too (L1,L2,L5 etc) but it's very easy to pump out wideband noise across all the GNSS bands.
[1] https://www.researchgate.net/figure/The-spectrum-of-current-...
Re: Flightradar24's new GPS jamming map
#188Earlier quoted context omitted.
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.
In addition to Armenia/Azerbaijan, Turkey has had a significant internal conflict with the PKK (Kurds) in the East/South East for... a very long time. Also that whole region is just patchy with flight data - it makes it difficult to really see the true shape of jamming.
> Turkey has had a significant internal conflict with the PKK (Kurds)
PKK the terrorist organization, yes. Kurds the ethnic group, no.
Re: Flightradar24's new GPS jamming map
#189I've been working on mapping GPS jamming using ADS-B data for a couple years, and I'll try to address questions and points brought up here based on what I know. Relevant previous posts on HN: 2022: https://news.ycombinator.com/item?id=32245346 2023: https://news.ycombinator.com/item?id=37868106 (From my comment on that 2023 post: "Why haven't FlightRadar24, FlightAware, or any of the other flight trackers done this?"…
"Do aircraft systems really only use GPS"
I know older long-range planes from the 70s and 80s had excellent inertial navigation systems.
Not quite as good as GPS, but good enough to know the location of the plane within a few nautical miles. The main problem is that inertial navigation systems drifted over time and required constant recalibration from the crew whenever they had a fix from real navigation beacons and errors could be catastrophic (especially when skirting the edge of Soviet airspace).
I've always wondered if modern avionics suites kept the older style inertial navigation systems as a backup to GPS, or if the systems were deleted when everyone switched to GPS.
I think it would be smart for larger planes to have a modern inertial navigation system that constantly recalibrated off GPS, ready to take over in the case of GPS jamming or spoofing.
Re: Flightradar24's new GPS jamming map
#190I've been working on mapping GPS jamming using ADS-B data for a couple years, and I'll try to address questions and points brought up here based on what I know. Relevant previous posts on HN: 2022: https://news.ycombinator.com/item?id=32245346 2023: https://news.ycombinator.com/item?id=37868106 (From my comment on that 2023 post: "Why haven't FlightRadar24, FlightAware, or any of the other flight trackers done this?"…
"Do aircraft systems really only use GPS" I know older long-range planes from the 70s and 80s had excellent inertial navigation systems. Not quite as good as GPS, but good enough to know the location of the plane within a few nautical miles. The main problem is that inertial navigation systems drifted over time and required constant recalibration from the crew whenever they had a fix from real navigation beacons and…
They do that! Unfortunately, they don't always know when they're being spoofed, so oops, your inertial reference system has just been infected by the spoofed location and now both nav systems are hosed.
https://ops.group/blog/gps-spoof-attacks-irs/
https://aerospace.honeywell.com/us/en/about-us/blogs/spoofin...