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Arise, you have nothing to lose but your barbed wire fences!

1998-04-22 - Re: Position escrow

Header Data

From: Phil Karn <karn@qualcomm.com>
To: shamrock@netcom.com
Message Hash: 761f846a2c547a10a494f5a4567e9e9e81765e97146cd6319711ca753a08e60d
Message ID: <199804220116.SAA22628@servo.qualcomm.com>
Reply To: <Pine.SUN.3.91.980421153643.2922A-100000@netcom5>
UTC Datetime: 1998-04-22 01:16:55 UTC
Raw Date: Tue, 21 Apr 1998 18:16:55 -0700 (PDT)

Raw message

From: Phil Karn <karn@qualcomm.com>
Date: Tue, 21 Apr 1998 18:16:55 -0700 (PDT)
To: shamrock@netcom.com
Subject: Re: Position escrow
In-Reply-To: <Pine.SUN.3.91.980421153643.2922A-100000@netcom5>
Message-ID: <199804220116.SAA22628@servo.qualcomm.com>
MIME-Version: 1.0
Content-Type: text/plain


Well, given that I work in CDMA, and given that CDMA provides some
inherent positioning capabilities, the possibility of defeating
positioning by hacking the phone software to "dither" the return link
signal timing has occurred to me.  It wouldn't let you appear to be in
a different cell than the one you're in, but it would certainly
decrease the measurement precision. You could disable the dither if
you want when you make an E911 call.

What sweet revenge that would be against the government that inflicted
Selective Availability on all us civilian GPS users. :-)

Phil

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