Re: Accelerometer and Kalman Filter

On Tue, 03 Mar 2009 13:57:00 -0500, Rich Webb wrote:

On Tue, 03 Mar 2009 12:00:13 -0600, "arvkr" <krarvind@xxxxxxxxx> wrote:


Normally this is done by backing up the inertial measurements with GPS
or

other radiolocation measurements -- what's holding you back from that?

--
http://www.wescottdesign.com


For the project i am working neither can i use GPS nor i have other
measurements, the challenge is to find out if a Dead Reckoning system
with accelerometer, compass and gyro will be good enough to estimate the
position somewhat accurately ( equal to GPS or slightly less accurate,
if its more accurate even better).

North, east, and down are easy (for an arbitrary definition of "easy");
so is latitude. Find the local compass declination and that should
suggest a longitude. Only a few more measurements would be needed to
resolve any remaining ambiguity. Making a real system that's capable of
doing this would be ... challenging.

This is exactly what I was referring to. Yes, it can be done. With
really accurate gyros, really accurate accelerometers, really accurate
compasses, and some really accurate maps of magnetic declination and
variations in gravity, you can figure out your approximate longitude.

But it ain't easy, and it ain't cheap.

--
http://www.wescottdesign.com
.

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