bluetooth proximity

[W. B. Kranendonk]

Hi List,

I wondered, can two bluetooth devices ping each other and find out their distance or relative speeds?

Not in the first place as some security tag to unlock my PC or house, but to use in a game-like setting. Imagine some live role playing game, where weapons not only are simulated using acceleration, but also their speed/distance relative to each other.

Any ideas on this?

Boudewijn