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Are you filtering out military planes?

by zyang 5y ago

jhugo 5y ago
There's no reason to if they are flying with ADS-B transmitting. They're broadcasting their position and will usually appear on FR24 etc. If they are flying without ADS-B (which is legal for the military when needed) they won't be picked up by this system so no filtering needed.
- btbuilder 5y ago
  According to [1] it’s not just the military, but “U.S. federal, state and local government aircraft performing sensitive operations” https://www.aviationtoday.com/2019/07/23/new-rule-allows-military-aircraft-turn-ads-b-transmissions-off/ https://www.aviationtoday.com/2019/07/23/new-rule-allows-mil...
  - jhugo 5y ago
    Correct, GP asked about military so I mentioned that it's legal for them to turn it off. It's also legal for intelligence, law enforcement, etc -- anything government-related with a good reason pretty much.
- Lammy 5y ago
  Phantom planes are also technically possible. One could even do it themselves using the "Havok" firmware for HackRF One. I won't link to it, but to quote its wiki, "Yes, it works. For real. If you want to try it out, DO NOT transmit on restricted bands and ESPECIALLY NOT on 1090MHz."
  - phire 5y ago
    Yes, 1090MHz is probably the stupidest bad to illegally transmit on. Not just because of the potential safety issue, but because of how easy it is to track you. In many areas, they have Wide Area Multilateration equipment installed that will show the real location of the transmitter, instead of the fake GPS coordinates you transmit. Normally it's there to double-check the ADS-B coordinates are correct, to track older planes without ADS-B, and to give true altitude readings, but it will track illegal transmitters as a side effect. Even in areas where they haven't installed a permanent MLAT system, they usually have some sort of equipment that can track down a 1090MHz transponder. For-example, search and rescue planes often carry one.
- nojs 5y ago
  Alternatively, you could use computer vision and only record the ones not transmitting - that would be an interesting data set!

Are you filtering out military planes?

by zyang 5y ago

Are you filtering out military planes?

There's no reason to if they are flying with ADS-B transmitting. They're broadcasting their position and will usually appear on FR24 etc. If they are flying without ADS-B (which is legal for the military when needed) they won't be picked up by this system so no filtering needed.

btbuilder 5y ago
According to [1] it’s not just the military, but “U.S. federal, state and local government aircraft performing sensitive operations” https://www.aviationtoday.com/2019/07/23/new-rule-allows-military-aircraft-turn-ads-b-transmissions-off/ https://www.aviationtoday.com/2019/07/23/new-rule-allows-mil...
- jhugo 5y ago
  Correct, GP asked about military so I mentioned that it's legal for them to turn it off. It's also legal for intelligence, law enforcement, etc -- anything government-related with a good reason pretty much.
Lammy 5y ago
Phantom planes are also technically possible. One could even do it themselves using the "Havok" firmware for HackRF One. I won't link to it, but to quote its wiki, "Yes, it works. For real. If you want to try it out, DO NOT transmit on restricted bands and ESPECIALLY NOT on 1090MHz."
- phire 5y ago
  Yes, 1090MHz is probably the stupidest bad to illegally transmit on. Not just because of the potential safety issue, but because of how easy it is to track you. In many areas, they have Wide Area Multilateration equipment installed that will show the real location of the transmitter, instead of the fake GPS coordinates you transmit. Normally it's there to double-check the ADS-B coordinates are correct, to track older planes without ADS-B, and to give true altitude readings, but it will track illegal transmitters as a side effect. Even in areas where they haven't installed a permanent MLAT system, they usually have some sort of equipment that can track down a 1090MHz transponder. For-example, search and rescue planes often carry one.
nojs 5y ago
Alternatively, you could use computer vision and only record the ones not transmitting - that would be an interesting data set!