Xref: utzoo rec.ham-radio:30761 sci.electronics:17590
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!oakhill!nddsun1!waters
From: waters@nddsun1.sps.mot.com (Mike Waters)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: GPS accuracy in wake of Desert Storm?
Message-ID: <830@nddsun1.sps.mot.com>
Date: 8 Feb 91 18:48:59 GMT
References: <1172.27A97FF9@w8grt.fidonet.org> <826@nddsun1.sps.mot.com> <39009@cup.portal.com>
Followup-To: rec.ham-radio
Organization: Motorola, Inc., Semiconductor Products Sector
Lines: 38

In article <39009@cup.portal.com> ts@cup.portal.com (Tim W Smith) writes:
>Uh, I think what was objected to in the orignal posting was not
>discussing how GPS works and how accurate it is, but the request
>for how to get around limitations the military imposes for
>security purposes.
>
>That hasn't been discussed in IEEE journals and Sailing, has it?

Interestingly enough it HAS been! 

(I pick my examples carefully you know - GOTCHA! :-) )

IEEE Spectrum about 18 months ago
featured a debate about the wisdom of ncrypting parts of the
information. THey drew analogies to WW II navigation aids which were
generally left in place because their removal caused more problems to
our side than aid to the enemy (we used them a LOT more :-) )

THey also described several techniques for defeating the encryption
indirectly. (I.e. not by breaking the code).

THe closing comment was an about a reporter who asked a Soviet Military
Attache about the possibillity of their using GPS to target missiles.
The response was essentially "You must be joking. THats the dumbest
thing we could ever do!".

All with far more circulation than Usenet!

Sailing magazine had a writeup on some methods to use GPS in a harbour
provided you has a reference point. THe "fuzzing" only destroys ABSOLUTE
accuracy, not relative accuracy according to their article.

73  Mike   AA4MW

-- 
       *Mike Waters    AA4MW/7  waters@dover.sps.mot.com *
 
 ** If guns are outlawed, how will conservatives win arguments? **