On Mon, 2005-08-29 at 16:34 -0500, Matthew Boehm wrote: > Andres wrote: > > > Phones would have an embedded GPS receiver that pinpoints the location > > Yea, but I can block a GPS signal with my finger. Its no good unless > you are outside in the open. 99% of IP phones and ATA's will be inside. > No gps inside.
Because gps is used so readily for so many apps, I was actually thinking about guilding a gps jammer. 100mW should do my vehicle fine or anywhere near me, and because of FCC rules I should be able to get away with that (I need to investigate the 'harmful interferance' clause to 100mW and below signals, although you can exceed that power if you lower the duty cycle (ie pulsed transmissions), that should be fine. Toss some gaussian noise or similar on the L1 control freq (about 1622MHz if memory serves) ... only higher end gps receivers that use S1 control data would get through, or the many many many many other satellite networks that provide location data, but most receivers dont work with those, at least in the consumer retail market in america. The AF did a 'accidental' test with a 5w transmitter a few miles up in the atmosphere and it totally hosed gps for everyone under that plane (pretty wide beam path too). I think it was an intentional test to verify if jammers could be used to disrupt smart weapons, but they insist that it was accidental. :) Who knows I may even be able to get FCC certified (unlikely) for the jammers and sell them as personal security devices to prevent stalkers/lovers (like the boyfriend that did that to his girlfriends car to see if she was cheating) from tracking you. Rental car companies (hertz at least) that do this and issue speeding tickets if the gps data says you went too fast or surcharges for going 'out of area' when you were lost or ... would have fits with these devices. I may have a research project for tomorrow going through part 68 and maybe part 15 on the fccs site :) -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378
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