Salah wrote:

> 1- recently I am interesting in the GPS based sys., I found a link
> explaining it`s princibles and where it can be used ... I am wondering if
> anybody know how it can be controlled what is the Hardware and software
> requirements to develop system based on GPS and how it can be integrated for
> example with specific product .... any links or design companies dealing
> with GPS .... I eagerly want to know how those cars get to their
> destinations .....


This can be a huge question however I'll try to be brief ....

Best bet is to use a GPS engine (this takes care of all the hard work).
You can also buy GPS devices as provided by companies like SiRF (
www.sirf.com) but unless your getting into a mass produced product (and
even then) the engine is the way to go. Examples;

www.u-blox.com
www.fastrax.fi
just to name two (there are many, try a Google search)


Next, depends on your engine manufacture. Generally speaking they all
support or conform to NMEA-0183 (check out www.nmea.org). These are
simple serial commands that can use most UART's on for example a PIC (to
keep the PIC flavour). Most manufacturers also offer faster port access
via propriatary interfaces. For those you'll reference each manufacturer.

Sorry, but am having a busy day so that's about all I can provide for
now. This should give you a start. You really gotta know what you want
to do with GPS first The rest, like most projects, really depends on
this  knowledge. Have a great day.

Cheers,

Kevin

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