RF Jim <jvpoll@DALLAS.NET> wrote:
> 2) the military (and other qualified users) have access to
> a 'chip rate' ten times what civilian users have with approximately
> ten times the accuracy commonly availiable on 'civilian' GPS
> receivers - aren't you?

This is a common misconception.

Actually, the chip rate has very little if anything to do with the overall
accuracy; the quality of the correlators and local clock is the real
limitation. The main reason military receivers do better is because they
get access to two different carrier frequencies, which allows them to
measure and compensate for atmospheric refraction in real-time.

-- Dave Tweed

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads