bluetooth proximity

[john]

Saw this at some mobile event:

http://www.vimeo.com/875097

2008/6/18 Ewan Marshall <ewanm89 at googlemail.com>:
> W. B. Kranendonk wrote:
>> --- On Mon, 6/16/08, Tilman Baumann <tilman at baumann.name> wrote:
>>
>>> AVee wrote:
>>>
>>>>>  (...) There are a lot of reasons
>>>>> why this is not feasible. Sorry.
>>>>>
>>>> I tend to agree, however, things might change if you
>>>>
>>> add gps. You'd might just (...) That leaves only the
>>> 'exact measurement' to be
>>>
>>>> solved.
>>>>
>>>> It might work, but the precision will probably still
>>>>
>>> be far to low to be
>>>
>>>> useable for anything.
>>>>
>>
>>
>>> (absolute position...) But the
>>> relative position should be extremely high. (As high as
>>> DGPS can get)
>>>
>>> At least in theory.
>>>
>>
>> Thanks for thinking along.
>>
>> What I was thinking of, in a game setting, to use the phone as some sort of hack & slash device. Given my opponent and me are withing reasonable proximity, she with -say- a spear-device, me with a sword or so. She could try stabbing me, while I parry. The devices have to calculate the hit ratio.
>>
>> Would a sound-code offer a possible solution? Could we measure some doppler effect with the built in microphone?
>>
> You'll be better off using the accelerometers...
>> And, on a side note... How impact proof will the phone be, might she try throwing her spear? :-P
>
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