3 ms·

Anyone care to explain in layman's terms what this is about?

by nanna 1y ago

echoangle 1y ago
There's a satellite that's measuring ground moisture by looking for radiation in a specific frequency. Some jammers in Ukraine (devices that send noise on radio to make communications impossible for other people) emit radiation in this frequency which makes it visible when looking at the data from the satellite.
- someothherguyy 1y ago
  https://en.wikipedia.org/wiki/Brightness_temperature https://en.wikipedia.org/wiki/Brightness_temperature https://web.archive.org/web/20230517192717/https://aquarius.oceansciences.org/docs/aq_qa_webinar1_session1.pdf https://web.archive.org/web/20230517192717/https://aquarius....
  - echoangle 1y ago
    I edited my comment, you're right that the measurement isn't really ground temperature.
- egorfine 1y ago
  > make communications impossible for other people for occupying armed forces.
  - echoangle 1y ago
    Well both sides are jamming, but that's one reason to jam, yes.
  - pc86 1y ago
    The jamming doesn't discriminate. Domestic armed forces and civilians are also impacted, so "other people" makes sense.
op00to 1y ago
There is a satellite that listens to solar radiation reflected off the earth to tell different things like ocean salinity. That particular frequency is also used in warfare. This satellite can be used to find areas where electronic countermeasures are in place.
mrweasel 1y ago
They used freely available NASA data to map Russian and Ukrainian electronic warfare systems. The jammers used leak into the 1.4 GHz spectrum, which is suppose to be silent, and does so which sufficient power that you can be pretty sure it's man made. So if you're looking for an intersting target, you could do worse than those lit up areas.
- parsimo2010 1y ago
  Small correction: the jammers used are specifically targeting the L-band, because it is used for navigation and satellite communications. Normally ground transmitters in this band are using just a couple watts or less, so they don’t significantly impact the readings of a satellite looking at a large area on the earth, but a jammer uses a lot more power and can be noticed.
- toomuchtodo 1y ago
  US to Provide Anti-GPS Jammer Sensors for Ukraine’s Precision-Guided Bombs - https://www.kyivpost.com/post/32163 https://www.kyivpost.com/post/32163 - May 6, 2024

Anyone care to explain in layman's terms what this is about?

by nanna 1y ago

Anyone care to explain in layman's terms what this is about?

There's a satellite that's measuring ground moisture by looking for radiation in a specific frequency. Some jammers in Ukraine (devices that send noise on radio to make communications impossible for other people) emit radiation in this frequency which makes it visible when looking at the data from the satellite.

someothherguyy 1y ago
https://en.wikipedia.org/wiki/Brightness_temperature https://en.wikipedia.org/wiki/Brightness_temperature https://web.archive.org/web/20230517192717/https://aquarius.oceansciences.org/docs/aq_qa_webinar1_session1.pdf https://web.archive.org/web/20230517192717/https://aquarius....
- echoangle 1y ago
  I edited my comment, you're right that the measurement isn't really ground temperature.
egorfine 1y ago
> make communications impossible for other people for occupying armed forces.
- echoangle 1y ago
  Well both sides are jamming, but that's one reason to jam, yes.
- pc86 1y ago
  The jamming doesn't discriminate. Domestic armed forces and civilians are also impacted, so "other people" makes sense.

op00to 1y ago

There is a satellite that listens to solar radiation reflected off the earth to tell different things like ocean salinity. That particular frequency is also used in warfare. This satellite can be used to find areas where electronic countermeasures are in place.

mrweasel 1y ago

They used freely available NASA data to map Russian and Ukrainian electronic warfare systems. The jammers used leak into the 1.4 GHz spectrum, which is suppose to be silent, and does so which sufficient power that you can be pretty sure it's man made. So if you're looking for an intersting target, you could do worse than those lit up areas.

parsimo2010 1y ago
Small correction: the jammers used are specifically targeting the L-band, because it is used for navigation and satellite communications. Normally ground transmitters in this band are using just a couple watts or less, so they don’t significantly impact the readings of a satellite looking at a large area on the earth, but a jammer uses a lot more power and can be noticed.
toomuchtodo 1y ago
US to Provide Anti-GPS Jammer Sensors for Ukraine’s Precision-Guided Bombs - https://www.kyivpost.com/post/32163 https://www.kyivpost.com/post/32163 - May 6, 2024