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GPSJam: Daily Maps of GPS Interference

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Re: GPSJam: Daily Maps of GPS Interference

#71

Post by mysterydip »

Rebelgecko wrote: post #69
mysterydip wrote: post #44

There 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.

Was it in a big city? Because parts of Japan are so vertical, they have a lot of trouble with urban canyons and multipath from signals getting reflected off of buildings (which is why they built the high-elevation QZSS mini-constellation to augment GPS)

IIRC it was walking through a park, near some kind of sculpture.

Re: GPSJam: Daily Maps of GPS Interference

#72

Post by gdy »

vincnetas wrote: post #45
gdy wrote: post #30

Earlier quoted context omitted.

Florida is a state, Kaliningrad isn't even an autonomous oblast.

It kinda is oblast : https://en.wikipedia.org/wiki/Kaliningrad_Oblast

Yes, but oblast has the smallest amount of autonomy. It's like a county in the GB or the US.

Re: GPSJam: Daily Maps of GPS Interference

#73

Post by gdy »

dvfjsdhgfv wrote: post #49
gdy wrote: post #33

Earlier quoted context omitted.

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…

Aegis uses Mk-41, which is a unified launcher for SM-3 and Tomahawk missiles. I believe Aegis Ashore uses the same launcher.

https://en.wikipedia.org/wiki/Mark_41_Vertical_Launching_Sys...

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

Re: GPSJam: Daily Maps of GPS Interference

#74

Post by gdy »

_52co wrote: post #51
gdy wrote: post #33

Earlier quoted context omitted.

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.

Albeit ineffectively, because they have an INS backup.

Also terrain contour matching [0] and Digital Scene Matching Area Correlation [1].

[0] https://en.wikipedia.org/wiki/TERCOM

[1] https://en.wikipedia.org/wiki/Tomahawk_(missile)#Navigation

Re: GPSJam: Daily Maps of GPS Interference

#75

Post by jjwiseman »

A quick update on some of the infrastructure behind the map: One day of being on the front page of HN has used up half of the Mapbox free quota of map loads. To sustain this level of traffic would cost me something like $2000/month just for Mapbox. Since this is a non-profit project that I do in my spare time, something is going to have to give.

Re: GPSJam: Daily Maps of GPS Interference

#76

Post by yencabulator »

jjwiseman wrote: post #75

A quick update on some of the infrastructure behind the map: One day of being on the front page of HN has used up half of the Mapbox free quota of map loads. To sustain this level of traffic would cost me something like $2000/month just for Mapbox. Since this is a non-profit project that I do in my spare time, something is going to have to give.

Since you don't actually need very detailed maps -- the hexagons are large, zooming in is pointless -- and your dynamic data is a simple overlay, I think you should be able to use static tiles generated just once. And you should be able to generate the tiles from free OpenStreetMap data, the country outlines & major cities there are plenty good enough for this use, even globally.

Yes, I know it's not as simple to throw together as just using Mapbox.

Re: GPSJam: Daily Maps of GPS Interference

#77

Post by yencabulator »

fmajid wrote: post #24
jjwiseman wrote: post #19

Earlier 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…

In the US there were incidents with truckers using illegal jammers to defeat their employers’ GPS trackers: https://www.cnet.com/culture/truck-driver-has-gps-jammer-acc...

It's not immediately obvious to me that a jammer employed on the surface will affect planes going overhead at 30,000 feet. Such consumer GPS jammer products will probably have better customer satisfaction if their range is less than several miles.

Re: GPSJam: Daily Maps of GPS Interference

#78

Post by thriftwy »

gdy wrote: post #72
vincnetas wrote: post #45

Earlier quoted context omitted.

It kinda is oblast : https://en.wikipedia.org/wiki/Kaliningrad_Oblast

Yes, but oblast has the smallest amount of autonomy. It's like a county in the GB or the US.

Traditionally, raion is a county-level subdivision, though these are now superceded by settlements (communes).

Oblast' is a top-level federation subject, comprised of these. Its's true that they are usually smaller and less authonomous than U. S. states.

Re: GPSJam: Daily Maps of GPS Interference

#79

Post by Maxion »

mysterydip wrote: post #44

There 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.

I have the same experience with a handheld garmin from like 20 years ago. This was in Finland while boating, the gps suddenly decided we were going around 700mph heading north north west. It lasted for around 30min or so before it returned us to where we were. I remember using a Garmin GPS 45.

https://panbo.com/my-garmin-gps-45-was-amazing-in-1994-and-i...

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