It is well known that in practical situations the observed input-output data of an identified plant are usually corrupted by measurement noise. In this case the ordinary least-squares estimator of the system parameters is biased. In order to obtain a consistent estimator, a new type of modified leas
Least-squares estimation of input/output models for distributed linear systems in the presence of noise
โ Scribed by J.S. Gibson; G.H. Lee; C.-F. Wu
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 330 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0005-1098
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โฆ Synopsis
This paper addresses least-squares estimation of parameters in digital input/output models of linear time-invariant distributed systems in the presence of white process and sensor noise. The systems of interest have state-space realizations in Hilbert spaces. Both "nite-dimensional and in"nite-dimensional input/output models are considered. The paper derives a number of new results for recursive least-squares estimation and "ltering. The main results characterize the asymptotic values to which parameter estimates converge with increasing amounts of data. The most important result is an equivalence between least-squares parameter estimation on an in"nite interval (i.e., with in"nitely long data sequences) and linear-quadratic optimal control on a "nite interval. Numerical results are presented for a sampled-data version of a wave equation.
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