Other than ultrasonic (which is the bulk of the google results), what =20
other technologies exist for relatively short (say <100ft) distance =20
measurement?  It would be nice to use RF (as we'll have some wireless =20
comms on the quad-copter), but my quick math tells me that I'd need to =20
detect nanosecond differences to get ever 1-ft resolution.  Any =20
thoughts on this?

Thanks,
-Neil.


--=20
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