It seems that the advance here is not that WiFi can be used as an alternative to GPS, but that sweeping multiple frequencies allows for high precision timing me

It seems that the advance here is not that WiFi can be used as an alternative to GPS, but that sweeping multiple frequencies allows for high precision timing measurements (hence the name "Chronos"). I suspect the same could be done with cellular frequencies on a much larger scale with similar improvements in accuracy. I am curious how the precision scales with more channels and lower frequencies. Edit: Apparently exploiting the phase change of a signal has been used to improve the accuracy of GPS in a similar ways [0]. The dual radio angle calculation seems to be a more novel advancement. [0] https://en.m.wikipedia.org/wiki/Real_Time_Kinematic https://en.m.wikipedia.org/wiki/Real_Time_Kinematic