Looks pretty cool, though kinda "cheating" by pulling from adsb.fi - though I think you'd need something a lot more powerful than an ESP32 to receive and decode ADS-B ;)
Perhaps I didn’t read it thoroughly enough but it seems that lat/long of the “radar” are expected to be entered by user, I think using wifi positioning could be of great assist and could be done from mcu itself without involving web portal, though maybe portal already does it (didn’t get to see it)
(But is is a cool project)
Biggest problem isn’t that it’s not powerful enough, but the USB port bandwidth don’t match most SDR.
Using some clever tricks you can receive parts of the message on a slower USB and be able to decode ADS-B
making esp32-based radar emitter would've been cool, tho