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Flightradar24 says "The aircraft's transponder reported good GPS signal quality from take-off to landing" 🤔
(via)
Transponder GPS-signal is separate from the instrument pilots use to fly the plane
They have separate receivers, but they're both on the same aircraft. It would be odd for one to be affected, but not the other.
If someone jammed your Bluetooth, you'd still be able to use wifi (to give a crude example). They target specific frequencies to mess with navigation.
OK, but we're talking about two different GPS systems on the same plane, so two systems of the same type.
Are they the same type? I'm not responding to argue, but do technologies like GLONASS, GPS, or Galileo operate over each other or on different wavelengths or frequency, or whatever they use?
Most modern receivers can use all three systems, so I think they're on similar frequencies.
I don't think GLONASS has enough satellites to get a reliable fix by itself.
Even when someone jams your WiFi you can still use WiFi by switching to a different frequency. I don't know what range of frequencies are available to GPS systems but I'd imagine they're broad enough that one can operate while the other is jammed.
If you want to jam anything you need enough power to produce a strong enough signal to overwhelm the target's receiver. I found the formula that lets you calculate how much power you'd need. In the example on the website the guy is trying to jam a radio 300m away. They need 7 watts to make 1db of noise. The power you need increases exponentially with the distance and with how much noise you want to make. That's why I can easily see this going into the millions of watts when you want to jam the GPS of an aircraft 10+km away.
That's possible for one frequency but as I said, GPS most definitely has several frequencies it operates on so jamming all of them at once might not even be possible with current technology.
Both systems are listening for the same signal though, from the same satellites, on the same frequency.
And you can't control what frequency the satellite transmits at.
They probably use a completely different frequency spectrum so no, probably not odd at all. Whether it actually happened is a different question, but technically its totally possible for only one to be jammed.
That's not really how GPS receivers work.
you're suggesting they jammed the pilots' GPS but not the transponder's?
ADS-B is quite far away from GPS frequencies, so yeah.
ADS-B is quite far away from GPS frequencies, so yeah.
ADS-B packets include coordinates from GPS as well as several values related to the estimated accuracy of said coordinates (which is how flightradar24 is reporting that they had good GPS signal throughout the flight).
Which implies they were spoofed rather than jammed.
Seems like they can't make up their minds lol
This blog post has some details about the bad reporting around this story (claiming they used paper maps, and that they were circling for an hour) but it ultimately does agree that the "some issue with the GPS" reported by the pilot (the post includes radio recordings from the air and again from the ground after landing where the pilot says "GPS issues") must in fact be some type of GPS interference.
Meanwhile flightradar24 says "Yes, and we’re also saying there is no evidence of spoofing. There are numerous issues that could have affected the crew’s ability to perform a GPS-based approach that aren’t related to jamming or spoofing."
🤷
They are two different signals, jamming one signal does not jam the other.
Flight24 indicates that there was a strong GPS signal throughout the flight. Is there some other type of signal which you think they jammed instead of GPS?
That is odd indeed.
The aircraft's transponder reported good GPS signal quality from take-off to landing.
Based on the ATC audio, the crew switched from the GPS-based approach to the ILS approach, necessitating a change in the flight path
These two things just dont add up
There isn't much information in this article, but I wouldn't be surprised it was spoofing not jamming.