Re:Homemade polarimetric synthetic aperture radar drone
by namibj on Monday February 17, 2025 @04:49AM
(#43077041)
No need to hold their position that accurately, just need to know, ideally in real-time.
Re:Homemade polarimetric synthetic aperture radar drone
by tecleandor on Monday February 17, 2025 @06:01AM
(#43077544)
At 6Ghz, 5cm wavelength, 1/10 would be 5mm. I think that might be a bit under regular RTK accuracy.
But at lower frequencies, maybe. Or you can do several passes with the same drone and process later :D
Re:Homemade polarimetric synthetic aperture radar drone
by nine_k on Monday February 17, 2025 @12:55PM
(#43081574)
If the drones use e.g. laser rangefinders to measure the distance to 2-3 known reflectors, and maybe to each other, with sub-mm accuracy, that may be enough.
Deploying an antenna that's effectively 50 or 100 m wide by lifting 10-20 drones, after some simple ground preparations, could be invaluable in many scenarios, especially for the military, of course.
Re:Homemade polarimetric synthetic aperture radar drone
by CamperBob2 on Monday February 17, 2025 @01:06PM
(#43081683)
The same technique as he uses here for synchronizing the receivers would work. Common reception and triangulation of a strong local beacon would enable positioning at much better than GNSS precision, both because of the SNR advantage itself and because you'd have more options for dealing with carrier phase ambiguity.
Re:Homemade polarimetric synthetic aperture radar drone
by bloopernova on Monday February 17, 2025 @09:39AM
(#43079451)
Does UWB provide enough accuracy to be useful or would you need something else?
The parabolic distribution is not at all needed in this case, you would just adjust the phase at each unit based on the distribution you have.
It is a thing that's considered, mostly for very low frequencies (1-100MHz) where all the above challenges are vastly simplified, and also large antennas (potentially km) are needed for any kind of directionality.