Acceleration will be just one of your problems. Consider time acquisition, 5
seconds window for commercial GPS is very narrow, it won't really get
accurate data in a short period of time when the GPS is moving fast. I don't
think a commercial GPS will fit your needs.

2009/1/4 Sean Breheny <shb7@cornell.edu>

> Hi all,
>
> I have a project where I am considering using a small GPS module to
> determine the maximum altitude of a model rocket. Looking at the
> typical limitations of consumer-grade GPS modules, they often are
> limited to 2 or 4G acceleration. I have not been able to find out what
> happens if you exceed that acceleration. I would guess that they lose
> lock on the GPS satellites and will reacquire lock after the
> acceleration goes below the limit. However, how long does it take for
> them to recover from the excessive acceleration?
>
> For example, in the model rocket, there might be 20 or 30G
> acceleration for 2 seconds and then a further 5 seconds before apogee.
> My project will work if the GPS unit reacquires a fix within 5 seconds
> of the rocket motor burn ending.
>
> Any thoughts?
>
> Thanks,
>
> Sean
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-- 
Ariel Rocholl
Madrid, Spain
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