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Start detecting signal reflections from airplanes. With multiple synchronized receivers you can build a passive radar. Single reflections can easily be spotte

Start detecting signal reflections from airplanes. With multiple synchronized receivers you can build a passive radar. Single reflections can easily be spotted by just staring at the spectrum (Doppler).

Enginerrrd 2y ago
I'm super into this idea as a project, can you point me to any design or signal processing info?
- kortilla 2y ago
  A lot of passive radar stuff is ends up export controlled so open source is sparse here
  - schnitzelbot 2y ago
    There are a lot of open source projects. And technology (algorithms and receivers) wise it isn't too complicated nor a secret. That stuff is almost 100 years old. An easy start is always looking at VHF reflection of strong transmitters that are not creating a lot of noise (like FM stations). ILS or VORs stations are classics. There are also a lot of meteor and space radars ( https://en.wikipedia.org/wiki/GRAVES_(system) https://en.wikipedia.org/wiki/GRAVES_(system) ). Universities are super happy in publishing very very detailed (https://www.iap-kborn.de/en/research/department-radar-remote-sensing/instruments/meteor-radars/juliusruh-meteor-radar/ https://www.iap-kborn.de/en/research/department-radar-remote...) specs of their sky radars. And frequencies are well known for ages.
- scottapotamas 2y ago
  Have a look at this (and other repos/website) https://github.com/30hours/blah2 https://github.com/30hours/blah2
- transpute 2y ago
  For room-scale passive radar, search HN for IEEE 802.11bf and WiFi 7 Sensing. https://github.com/Marsrocky/Awesome-WiFi-CSI-Sensing https://github.com/Marsrocky/Awesome-WiFi-CSI-Sensing