I'm considering options for knowing how far I am from a starting point (to within say 10cm over max 30m) even if I haven't got line-of-sight on the starting point. One idea I have for doing this is to put an Ultrasonic transmitter at the start point and modulate a timestamp on to its signal, then receive the signal, read the time from the signal and compare it with the actual receipt time. Assuming the clocks on the transmitter and receiver are synchronised, the time difference would then be proportional to the distance.
What I would like input on is how do I modulate the timestamp on to the signal?
Or is there a better way of doing this altogether?
What I would like input on is how do I modulate the timestamp on to the signal?
Or is there a better way of doing this altogether?