Re: Accelerometer + Tilt compensation

jdhar <jai.dhar@xxxxxxxxx> wrote in news:ef127ec5-bc55-45f7-a332-
590e28fd2743@xxxxxxxxxxxxxxxxxxxxxxxxxxx:


I guess I'm the one that's confused, then. In calm conditions, at a
constant speed, there is no acceleration other than gravity. Are you
just trying to measure pitch and roll? If so, mount your instrument
and
do some inclination tests, which should allow estimating the alignment
errors of the sensors.


No, we are just confusing each-other over time :) In calm conditions,
zero-speed, I am trying to measure pitch and roll. I am trying to do
this so I can know how to de-rotate all my future readings which will
be in calm conditions, but non-zero and non-constant velocity. Knowing
the (X,Y,Z) forces on the boat is of particular interest in my
application (when the boat is moving), so I just want to make sure
that my readings are compensated for errors in mounting the sensor as
much as possible. Things like waves and what not are out of my
control, and are not of concern to this application.

--
Rich Webb     Norfolk, VA



Still sounds to me like high-pass filtering is what you need to do.
Everything you seem to be saying seems to bring this home. This is how
accelerometers are dealt with, unless there's a reason to do otherwise,
but I still haven't seen an "I need low frequency content because...."
statement.


--
Scott
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