At 11:49 AM 10/18/2004, M. Adam Davis wrote:

>Dave VanHorn wrote:
>
>>That's what was bothering me.
>>How do you measure gravity, in a portable instrument, when it's being 
>>bumped and banged around?
>
>Use a slower sampling period.  If you measure (integrate) the instrument 
>over 10 seconds/minutes/hours/days you can pretty much zero out all the 
>effects of movement that have smaller periods (1/2 the sampling rate or 
>integration period, per nyquist).  Of course you're trading off update rate.

That, and some fun tricks to clean up what the sensor sees, is what I 
expected.

I like "fun" sensor problems. They make my head hurt sometimes, but always 
satisfying in the end to come up with an inexpensive and effective solution 
to the problem.


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