On Sat, 23 Oct 2010 10:27:46 -0700, "PICdude" said:
> 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?

Optical with triangulation works to some extent. This assumes you get
decent reflection. But so do any methods other than using a probe stick
:)

Cheerful regards,

Bob

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