"Curtis L. Olson" <[EMAIL PROTECTED]> wrote: > Martin Spott wrote: >> With other words: Kalman filters enable you exact guessing of the >> picture where mathematical equations don't do the job because you have >> too many unknown parameters compared to the number of input sources. >> I believe the autopilot mailing list archive contains a lot of useful >> explanations to kalman filtering,
> I'm probably wrong, but I got the impression that maybe one person over on > the autopilot list (Aaron?) understood Kalman filters well enough to > actually impliment them in a real world system. :-) I dont't think you're wrong ;-) > I like your explanation better than mine though, except I'm not sure about > "exact guessing." Maybe I would say "good/best guessing" about the future > given noisy and changing inputs, and some knowledge about the error > tolerances of the guess. And like you say, the guess is much better than > you could generally get with a simple mathematical relationship. More than that. I did a lot of 'research' on my own to build a cheap AHRS (Autonomous Heading and Reference System) over the years (for the tilt rotor project). I had the aim to generate a system that gets a "red button" for the pilot. In case the pilot hits this button the aircraft would stop immediately and remain at the current position. You can build a pretty cheap system to determine the direction of gravity using a handful piezo acceleration sensors - as long as you don't neet to take horizontal acceleration into count. You can easily build a system that tells you the horizontal acceleration - as long as your aircrafts z-axis is parallel to the direction of gravity. You definitely can't resolve this with mathematical equations (I believe i know a bit about solving complex mathematical equations) and I have the impression that this is the point where kalman filters come into play, Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -------------------------------------------------------------------------- _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
