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From: ken@hertz.njit.edu (ken ng cccc)
Newsgroups: sci.electronics
Subject: Re: GPS system receiver
Message-ID: <1991May21.201152.21551@njitgw.njit.edu>
Date: 21 May 91 20:11:52 GMT
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In article <12780006@hpuplca.nsr.hp.com> jeff@hpuplca.nsr.hp.com (   Jeff Gruszynski  ) writes:
:	In my previous life I worked with military satellites including
:	GPS.  I once considered building my own receiver, so I called up
:	the GPS program office and asked for some unclassified technical
:	data on the system.  Several boxes of stuff later I concluded
:	it would be of the order of building a satellite TV receiver *and*

What government agency did you go to and what did you ask for?  From the
Air Force I got a copy of the SV interface specification and an introduction
to GPS.  Combined its about 2 inches thick.  From the Institute of Navigation
I got the reprints on the design and experiments with GPS, that's 3 half
height books about 3 inches thick.  Assorted magazine article xeroxes comes
to about an inch thick.  But still, unless you've got some pretty small
boxes, I'm curious as to what you have.  I'm also willing to trade where
I got my stuff if anyone is interested.

:	descrambler from scratch.  You need to sync on to a spread spectrum
:	signal and do a fair amount of post-processing.  Without good
:	microwave and digital CAD tools it would be painful.  

Yup, its by no means trivial.

:	On the other hand I've heard a division of Rockwell Int'l is planning
:	to come out with a ~$250 personal GPS receiver.

I'm dying to find out where I can get one of these beasts.  I've heard that
its a 5 chanel unit which makes it REAL NICE :-).

Kenneth Ng
"No problem, this is how you make it" -- R. Barclay, ST: TNG