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˙x(t) = −Lˆx(t) = u(t), ei(t) = ˆxi(t) − xi(t), <br />

<br />

|ei(t)| ≤ c1e −α(t)t , <br />

α <br />

<br />

ˆα(k) = ˆ λ(k), for k ∈ N, and α(t) = γ ˆα(k), for t ∈ [k, k + 1), <br />

0 < γ < 1 ˆ λ(k) <br />

<br />

ˆα(k) = ˆ λ(k) ≤ λ⋆(L). <br />

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<br />

<br />

<br />

<br />

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<br />

σz = 1 σx = 0.01d<br />

σy = 0.01d σθ = 2.5 <br />

d

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