7 ms·

Is interference the same as jamming? I am absolutely no expert in this but I can imagine that even natural occurrences can interfere with the GPS.

imoverclocked 2y ago
There are things that will naturally interfere with GPS and they are fairly well known. The FAA provides an expected outage map [1] (a forecast, if you will) for pilots that may need that info. Jamming is an act by humans to intentionally disrupt the GPS signal. [1] https://sapt.faa.gov/outages.php?outageType=129001450&outageResolution=0.5 https://sapt.faa.gov/outages.php?outageType=129001450&outage...
- kube-system 2y ago
  And I think the above commenter's point is that ADS-B data does not indicate intentionality.
  - imoverclocked 2y ago
    Could be. I was directly answering "what's the difference?" It's hard to know intentionality without also knowing where there is expected+natural interference. Of course, when a region is surrounded by persistent GNSS issues and is a known war-zone with large actors, intentionality is fairly reasonably assumed.
mmwelt 2y ago
The GPS jamming map linked to in the article[1] discusses this somewhat, in the "About the data" box: - ADS-B messages include position information from Global Navigation Satellite Systems (GNSS), like GPS, Galileo, GLONASS, BeiDou, etc. - It is not possible to directly measure GNSS interference, but we do calculate the NIC (Navigation integrity category) for ADS-B messages. - The NIC value encodes the quality and consistency of navigational data received by the aircraft. - 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. [1] https://www.flightradar24.com/data/gps-jamming https://www.flightradar24.com/data/gps-jamming

imoverclocked 2y ago

There are things that will naturally interfere with GPS and they are fairly well known. The FAA provides an expected outage map [1] (a forecast, if you will) for pilots that may need that info. Jamming is an act by humans to intentionally disrupt the GPS signal. [1] https://sapt.faa.gov/outages.php?outageType=129001450&outageResolution=0.5 https://sapt.faa.gov/outages.php?outageType=129001450&outage...

kube-system 2y ago
And I think the above commenter's point is that ADS-B data does not indicate intentionality.
- imoverclocked 2y ago
  Could be. I was directly answering "what's the difference?" It's hard to know intentionality without also knowing where there is expected+natural interference. Of course, when a region is surrounded by persistent GNSS issues and is a known war-zone with large actors, intentionality is fairly reasonably assumed.

mmwelt 2y ago

The GPS jamming map linked to in the article[1] discusses this somewhat, in the "About the data" box: - ADS-B messages include position information from Global Navigation Satellite Systems (GNSS), like GPS, Galileo, GLONASS, BeiDou, etc. - It is not possible to directly measure GNSS interference, but we do calculate the NIC (Navigation integrity category) for ADS-B messages. - The NIC value encodes the quality and consistency of navigational data received by the aircraft. - 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. [1] https://www.flightradar24.com/data/gps-jamming https://www.flightradar24.com/data/gps-jamming