Let's say I do have access to phase shift information.  Am I only able to
derive speed (directionless magnitude) from these measurements or can I
actually calculate a velocity vector?

Thanks,
Jas.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Russell McMahon
Sent: 21. november 2002 11:29AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT]: While on the subject of GPS...


> OK, so I was asked to put together a GPS speedometer. I thought it would
be
> fairly simple, but now I'm not so sure I can expect accuracy without a
fair
> amount of complexity.
> Is it worth the trouble?

Speed can be deduced from position variation with time BUT you have a speed
signal already available based on phase shift of received signals. It would
be trivial to use this for a speedometer function and you could add code to
make an informed decision about whether something "intetresting" was
happening.

Given that it's so easy to try, why not try it and see how it works out.


        RM

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