Spam:[extropy-chat] PRIVACY: GPS darts
dgc at cox.net
Thu Apr 22 20:55:23 UTC 2004
Samantha Atkins wrote:
> Hmmm. Are there any technical reasons such a thing could not be built?
Yes. We've had a long discussion on this.
1) GPS uses radio wavelengths that require an antenna that is at least
2) A transmitter that can send locator signal 100' or more must have
both a big (4cm or so) antenna and a battery or other energy source will
These constraints are due to the laws of physics and will remain true
even if the actual electronics are reduced to nano-scale.
Thus, a stealthy injectable system based on GPS location and radio
transmission is not possible.
It is theoretically possible to build a stealthy tracker, but we need to
replace both the location system and the transmission system. to avoid
the antennas. For example, given sophisticated nanotech, we could inject
a nano-factory that would then manufacture locator dust and leave smart
trail. The authorities could then follow the trail, or lay a grid of
more smart dust to intersect the trail. Of course, by the time you have
such a system, you don't need it, because with that level of nanotech,
you can just as easily build a universal survailence system. I describe
it only as an example of a system that does not violate the laws of physics.
Without invoking nanotech, I think a universal surveillance system based
on cheap cameras with human watchers is quite feasible, given an
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