You can get rough areas with a GPS and a RTLSDR and a bunch of samples (either over time OR with lots of people with the same device)
But to get fine granular data, you need a timestamping SDR. (each parcel of signal data for a quantum of data needs an exact time down to 6-8 significant figures, basically GPS timebase).
Most your cheaper SDRs cant do that.
Stuff like the BladeRF and higher do provide timestamped data.
But to get fine granular data, you need a timestamping SDR. (each parcel of signal data for a quantum of data needs an exact time down to 6-8 significant figures, basically GPS timebase).
Most your cheaper SDRs cant do that.
Stuff like the BladeRF and higher do provide timestamped data.