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New Results in Linear Filtering and Prediction Theory

Kalman, R. E., Bucy, R. S.·1961·Journal of Basic Engineering

Abstract

A nonlinear differential equation of the Riccati type is derived for the covariance matrix of the optimal filtering error. The solution of this “variance equation” completely specifies the optimal filter for either finite or infinite smoothing intervals and stationary or nonstationary statistics. The variance equation is closely related to the Hamiltonian (canonical) differential equations of the calculus of variations. Analytic solutions are available in some cases. The significance of the variance equation is illustrated by examples which duplicate, simplify, or extend earlier results in this field. The Duality Principle relating stochastic estimation and deterministic control problems plays an important role in the proof of theoretical results. In several examples, the estimation problem and its dual are discussed side-by-side. Properties of the variance equation are of great interest in the theory of adaptive systems. Some aspects of this are considered briefly.

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Metadata

Authors
Kalman, R. E., & Bucy, R. S.
Venue
Journal of Basic Engineering
Published
1961-03-01
Volume
83
Issue
1
Pages
95-108
ISSN
0021-9223 (ISSN-L)
OpenAlex
W2083402998
Cited by
6,387
References
2
FWCI
11.84
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: New Results in Linear Filtering and Prediction Theory. https://app.cochat.ai/papers/10.1115/1.3658902
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Kalman, R. E., & Bucy, R. S. (1961). New Results in Linear Filtering and Prediction Theory. Journal of Basic Engineering. https://doi.org/10.1115/1.3658902

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