Google hosted the Google decimeter challenge, which used post processing of data from dual band phones to try and get as good accuracy as possible. The top submissions got an accuracy of just over one meter.
I have a phone with dual band GNSS, and it's by far the best location accuracy I've had in any device. I can see which side of the cycle path I've been on, and it regularly works indoors. I don't live where there are tall buildings though, but even at fairly open space my older devices gave worse results. And I get a fix within seconds thanks to A-GPS.
I have a phone with dual band GNSS, and it's by far the best location accuracy I've had in any device. I can see which side of the cycle path I've been on, and it regularly works indoors. I don't live where there are tall buildings though, but even at fairly open space my older devices gave worse results. And I get a fix within seconds thanks to A-GPS.
https://www.kaggle.com/competitions/smartphone-decimeter-202...