On Mon, 01 Oct 2007 19:03:31 -0700, pnachtwey wrote:

-- snip --

Unless I'm sadly mistaken a Kalman or H-infinity filter, when used in a control system, is nothing more than a formally constructed time-varying observer. If you don't like (or don't need) the time-varying part, then a steady-state Kalman or H-infinity filter (if done right) pretty much meets the criterion for "well constructed observer".

AFAIK, yes.

Probably not. But the folks working on those models and simulations put a whole lot more effort into them than usually goes into a model for an industrial system. Certainly, if you are

-- snip --

Unless I'm sadly mistaken a Kalman or H-infinity filter, when used in a control system, is nothing more than a formally constructed time-varying observer. If you don't like (or don't need) the time-varying part, then a steady-state Kalman or H-infinity filter (if done right) pretty much meets the criterion for "well constructed observer".

AFAIK, yes.

Probably not. But the folks working on those models and simulations put a whole lot more effort into them than usually goes into a model for an industrial system. Certainly, if you are

___really___careful with your math then you can squeeze some valid intuition out of it -- but it doesn't just happen automatically.
--

Tim Wescott

Control systems and communications consulting

Tim Wescott

Control systems and communications consulting

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