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Flightradar24's new GPS jamming map

flightradar24.com

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Re: Flightradar24's new GPS jamming map

#11

Post by gregmac »

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 positioning. However, when observed in multiple aircraft in close proximity during the same time frame, it suggests the presence of a radio signal interfering with normal GNSS operation.

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.

Re: Flightradar24's new GPS jamming map

#14

Post by hammock »

wyldfire wrote: post #6

I wonder why there's some jamming near a small section of the Texas/Mexico border?

That is Eagle Pass, TX. The infamous, massive border crossing area where suspected criminal border crossers are corraled under the bridge, where Elon visited, etc.

The jamming is done to make crossing the border without going through the checkpoint more difficult

Re: Flightradar24's new GPS jamming map

#17

Post by seatac76 »

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…

I was curious too. Did some sleuthing, it looks more like Punjab. I think that’s to block drone infiltration from Pakistan [1]. It does change going back to 14th March there is no jamming in the region, US and Europe blobs also reduced, so I think this stuff is event driven, wonder what goes on, fascinating stuff.

[1]https://www.thehindu.com/news/national/other-states/over-100...

Re: Flightradar24's new GPS jamming map

#20

Post by muglug »

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…

Their data comes from commercial flights. If there are no flights, there's no data. There aren't many commercial flights over Ukraine or Belarus right now, so that whole area's empty.
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