Re: For Liars and Loafers, Cellphones Offer an Alibi
At 12:25 AM 6/27/04 -0500, Riad S. Wahby wrote:
Triangluating on a non-isotropic antenna should be quite a bit harder...
Bingo. Watch your sidelobes, baby.
On Sat, Jun 26, 2004 at 10:46:53PM -0700, Major Variola (ret) wrote:
At 12:25 AM 6/27/04 -0500, Riad S. Wahby wrote:
Triangluating on a non-isotropic antenna should be quite a bit harder...
Bingo. Watch your sidelobes, baby.
Triangulation by signal strength is one thing, triangulation by relativistic ToF (time of flight) -- while still not present in consumer gadgets -- is far more difficult to fool. Especially if it's tied into the protocol, that you're getting position fixes along with your sent packets. UWB has such large power and spectrum usage advantages is that I expect most mobile wireless, especialy short-range, would be UWB within a decade, or less. -- Eugen* Leitl <a href="http://leitl.org">leitl</a> ______________________________________________________________ ICBM: 48.07078, 11.61144 http://www.leitl.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE http://moleculardevices.org http://nanomachines.net [demime 1.01d removed an attachment of type application/pgp-signature]
On Sun, 27 Jun 2004, Eugen Leitl wrote:
Triangulation by signal strength is one thing, triangulation by relativistic ToF (time of flight) -- while still not present in consumer gadgets -- is far more difficult to fool. Especially if it's tied into the protocol, that you're getting position fixes along with your sent packets.
You may cheat and use the geography, if suitable, to your advantage. Use a high-gain antenna and bounce the signal off a suitable cliff or building. Multipaths don't have to be enemies; pick a suitable one and use it as a cover. The added advantage is fooling both the direction and the distance.
participants (3)
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Eugen Leitl -
Major Variola (ret) -
Thomas Shaddack