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Timeline for Why does tracking different plant states result in totally different observer estimates?

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S Jan 3, 2019 at 20:54 history bounty ended rrz0
S Jan 3, 2019 at 20:54 history notice removed rrz0
Jan 2, 2019 at 9:54 vote accept rrz0
Dec 29, 2018 at 19:21 answer added TimWescott timeline score: 1
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Dec 28, 2018 at 21:54 answer added TimWescott timeline score: 2
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Dec 28, 2018 at 21:47 comment added rrz0 As I just noted in the edited question, the only observer state which is following the actual plant state, is the state compared directly in the summing block. Thus the observer is actually working for a single state out of the four, which is pretty useless. I want to be able to determine all states from one single plant state.
Dec 28, 2018 at 21:45 comment added TimWescott You can construct an observer with as many fewer states as there are linearly independent rows in the output gain matrix (C in your notation). So a 4-state SISO system could have a 3-state observer (and a 4-state system with four outputs could conceivably have a zero-state observer). It's been a while since I've gone around dotting academic 'i's and 't's, so I forgot the nomenclature.
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Dec 28, 2018 at 12:00 history tweeted twitter.com/StackElectronix/status/1078621743894405120
Dec 28, 2018 at 12:00 comment added rrz0 @TimWescott, using a Luenberger observer I should be able to estimate all states from a single state. The Luenberger observer is a minimum order observer such that it is designed to reconstruct all state variables.
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S Dec 27, 2018 at 19:30 history bounty started rrz0
S Dec 27, 2018 at 19:30 history notice added rrz0 Draw attention
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Dec 24, 2018 at 9:18 comment added rrz0 @TimWescott, yes resulting eigenvalues and matrices for eig(A-B*K) and eig(A-L*C), were checked and all seemed to be reasonable.
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Dec 23, 2018 at 20:43 comment added TimWescott Third -- you may want to put together the augmented system (plant model + observer), check it visually to see if it looks reasonable, and then to simulate it (I assume you use step, but I'm a Scilab guy not a Matlab guy).
Dec 23, 2018 at 20:42 comment added TimWescott Second -- did you look at the resulting system matrices and vectors, to make sure the values looked reasonable?
Dec 23, 2018 at 20:41 comment added TimWescott First -- I thought a Luenberger observer is reduced-state. Doesn't that mean a 3-state observer?
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Dec 23, 2018 at 15:52 history asked rrz0 CC BY-SA 4.0
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