I may not be completely up to date on what they are doing now but I
believe that their sensors consist of a combination of inertial and a
special high-speed vision system which exists off-board from the
vehicles. This is not the same camera that took the video - it is a
special set of calibrated cameras with very high frame rate.

Sean


On Tue, Feb 26, 2013 at 8:29 PM, John Gardner <goflo3@gmail.com> wrote:
> Russell posted this link...
>
> http://robohub.org/video-throwing-and-catching-an-inverted-pendulum-with-=
quadrocopters/
>
> which does'nt mention the nature of the control inputs.
>
> Inertial?
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