TELECOM 247

>
> You obviously do not know of the phase difference technology that has
> been in use for some time. Prior to that, it was possible to know
> which cell the phone was in, and perhaps make a guess as to how far
> away the phone is from the base by its signal strength.
>
> What you can do these days is to send a specific locate signal to
> the phone. The phone will then proceed to receive two or three base
> station service signals (provided there is more than one within
> range). Using the difference in time between the synchronised base
> signals, it can determine its relative position to an accuracy of
> about 100m. There is an ambiguity when only 2 base stations are
> within range, which can usually be resolved by using other factors.