the cell can't know when the signal was transmitted without some prior time or location knowledge?
The signal that GPS satellites broadcast includes the current time, so knowing when the signal was transmitted is easy.
Knowing when it was received is harder, you would need a calibrated, synchronized clock. But you need to receive multiple signals to figure out your clock, so keep reading for that.
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The signal that GPS satellites broadcast includes the current time, so knowing when the signal was transmitted is easy.
Knowing when it was received is harder, you would need a calibrated, synchronized clock. But you need to receive multiple signals to figure out your clock, so keep reading for that.