I need to know how to make real-world use of accelerometer measurements. We have a Summit Instruments 3-axis unit with a 1K rolloff frequency (hardware filtering cuts that back to about 100 Hz).
Just calculating gravity has proved to be more difficult than I had thought, as even with a very long low pass filter, I am still left with wiggles that can't possibly be from a change in gravity.
The integration error getting to velocity is huge, orders of magnitude larger than my known average velocity. Determining displacement remains just a dream.
I have had some success in caging my errors since I do have a known average velocity and can detect points in the data where all motion has stopped, providing me with some known zero velocity points.
Can anyone steer me in the direction of application-level references (theory books are pretty much useless)?
I keep running into Kalman filters. What is special about them and why would they be applied to the accelerometer problem?
2007-08-13
08:49:21
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3 answers
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asked by
dogsafire
7
in
Engineering