Torsten Söderström's home page


Background

I have a M Sc in engineering physics (Civilingenjör teknisk fysik), 1969, and a PhD in automatic control (Tekn Dr i reglerteknik), both from Lund Institute of Technology. I moved to Uppsala University in 1974, where I am a professor of automatic control. I was the head of the Department of Systems and Control 1975-1999. I am an IEEE Fellow.

Research interests

My main research interests are in the fields of system identification, statistical signal processing, and adaptive systems. More recent interests include also identification of continuous-time models, parameter estimation in infinite-dimensional systems, numerical algorithms in control and signal processing, and modelling and control of mechanical systems.

Teaching

Undergraduate teaching

Fall 2003:
Control design (F4, IT4) 
Computer-controlled systems (W4, STS4)
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Fall 2002:
Control design (F4, IT4)
Computer-controlled systems (W4)
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Spring 2002:
Adaptive systems (F4)
Fall 2001:
Control design (F4, IT4)
Computer-controlled systems (W4)
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Spring 2001: 
Adaptive systems (F4)
Fall 2000: 
Sampled-data control systems (F4)
Computer-controlled systems (W4)
More information
 

Teaching in the PhD programs

Spring 2003:
Stochastic dynamic systems, 10 units
Fall 2001:
Stochastic dynamic systems, 10 units
Spring 2001:
Recursive identification, 7 units
Fall 1999:
Stochastic dynamic systems, 10 units
 

Research projects

* Identification of continuous-time systems
(part of the multiproject Statistical signal processing)

* Errors-in-variables modelling

* Identification of nonlinear systems
(part of the multiproject Statistical signal processing)

* Identification of viscoelastic materials
(a previous progress report for this project)

* Parameter estimation in heat conduction and diffusion
(a previous progress report for this project)

* Control of waves, vibrations and stability in mechanical structures

* Numerical algorithms in systems and control

PhD students currently working in these projects:  
Emad Abd-ElRady, Mei Hong,Peter Karlsson, Hans Norlander, Agnes Runqvist.

Recently graduated PhD's  engaged in these projects:
Bharath Bhikkaji, Erik K. Larsson, Kaushik Mahata.
 

Some other professional activities

Editor of Automatica, subject area System Parameter Estimation, 1992-present.

Within IFAC, International Federation of Automatic Control,
I was a Council member 1996-2002, 
Executive Board member 1999-2002,
and Chair of the Awards Committee 1999-2002.

Within EUCA, European Union Control Association,
I am a council member, 2001-present.

Selected recent publications

Books
 
 
T. Söderström: Discrete-Time Stochastic Systems - Estimation and Control. 
Second edition, Springer-Verlag, London, UK, 2002. (375 pp)

A new printing of the textbook
T. Söderström and P. Stoica: System Identification,
originally published by Prentice Hall International, has been arranged. 
Details on how to order copies from us.
If you have other questions, contact Ingegerd Wass.

Papers
 
 

(For a more complete list, visit the total publication list of the group):

E. Abd-Elrady, T. Söderström and T. Wigren: Periodic signal modeling.l IEEE Transactions on Automatic Control, to appear.

E. Abd-Elrady, T. Söderström and T. Wigren: Periodic signal analysis using orbits of nonlinear ODEs based on Markov estimate. IFAC Workshop on Control Systems (PSWYCO 04), Yokohama, Japan, August 31-September 01, 2004.

K. Mahata and T. Söderström: Improved estimation performance using known linear constraints. Automatica, vol 40, no 8, pp 1307-1318, August 2004.

K. Mahata and T. Söderström: Large sample properties of separable nonlinear least squares estimators. IEEE Transactions on Signal Processing, vol 52, no 6, pp 1650-1658, June 2004.

K. Mahata and T. Söderström: ESPRIT like estimation of real-valued sinusoidal frequencies. IEEE Transactions on Signal Processing, vol 52, no 5, pp 1161-1170, May 2004.

T. Söderström and M. Hong: Identification of dynamic errors-in-variables systems with periodic data. Reglermöte 2004, (National Conference on Control), Gothenburg, Sweden, May 26-27, 2004.

P. Karlsson, H. Norlander, A. Jansson and T. Söderström: Modeling and control of a viscoelastic piezolaminated beam. Reglermöte 2004, (National Conference on Control), Gothenburg, Sweden, May 26-27, 2004.

K. Mahata, T. Söderström and L. Hillström: Computationally efficient estimation of wave propagation functions from 1-D wave experiments on viscoelastic materials. Automatica, vol 40, no 5, pp 713-727, May 2004.

T. Söderström: Identification of linear systems in time domain. Encyclopedia of Life Support Systems (EOLSS), developed under the auspices of Unesco, EOLSS publishers, Oxford, UK, 2003. [http://www.eolss.net]

T. Söderström: Prediction error methods. Encyclopedia of Life Support Systems (EOLSS), developed under the auspices of Unesco, EOLSS publishers, Oxford, UK, 2003. [http://www.eolss.net]

K. Mahata, S. Mousavi, T. Söderström, M. Mossberg, U. Valdek and L. Hillström: On the use of flexural wave propagation experiments for identification of complex modulus. IEEE Transactions on Control Systems Technology, vol 11, no 6, pp 863-874, November 2003.

T. Söderström: Why are errors-in-varibles problems often tricky? European Control Conference, ECC 2003, September 01-04, 2003, Cambridge, UK.

K. Mahata, T. Söderström and L. Hillström: Computationally efficient estimation of wave propagation functions of viscoelastic materials. 13th IFAC Sympoisum on System Identification, SYSID 2003, August 27-29, 2003,  Rotterdam, The Netherlands

T. Wigren, E. Abd-Elrady and T. Söderström: Least squares harmonic signal analysis using periodic orbits of ODEs. 13th IFAC Sympoisum on System Identification, SYSID 2003, August 27-29, 2003, Rotterdam, The Netherlands.

B. Bhikkaji, T. Söderström and K. Mahata: A recursive algorithm for estimating parameters in a one dimensional diffusion system. 13th IFAC Sympoisum on System Identification, SYSID 2003, August 27-29, 2003, Rotterdam, The Netherlands.

K. Kumamaru, K. Inoue, Y. Hosoyamada and  T. Söderström: Fault detection of nonlinear systems based on multi-form quasi-ARMAX modeling and its application to the ship benchmark. 13th IFAC Sympoisum on System Identification, SYSID 2003, August 27-29, 2003, Rotterdam, The Netherlands.

T. Wigren, E. Abd-Elrady and T. Söderström: Harmonic signal analysis with Kalman filters using periodic orbits of nonlinear ODEs. ICASSP 2003, IEEE International Conference on Acoustics, Speech and Signal Processing, April 6-10, 2003, Hongkong.

T. Söderström, K. Mahata and U. Soverini: Identification of dynamic errors-in-variables model: Approaches based on two-dimensional ARMA modelling of the data. Automatica, vol 39, no 5, 929-935, May 2003.

T. Söderström: System identification techniques for estimating material functions from wave propagation experiments. Inverse Problems in Engineering, vol 10, no 5, 413-439. October 2002.

T. Söderström, U.Soverini and K. Mahata: Perspectives on errors-in-variables estimation for dynamic systems. Signal Processing, vol 82, no 8, 1139-1154, August 2002.

T. Söderström, M. Sebek, J. Jezek, V. Kucera and D. Henrion: An evaluation of algorithms for computing the covariance function of a multivariable ARMA process. European Journal of Control, vol 8, no 4, 315-325, 2002.

T. Söderström, K. Mahata and U. Soverini: Identification of dynamic errors-in-variables model using a frequency domain Frisch scheme. Proc. 15th IFAC World Congress, Barcelona, Spain, July 21-26, 2002.

K. Mahata and T. Söderström: Identification of dynamic  errors-in-variables model using prefiltered data. Proc. 15th IFAC World Congress, Barcelona, Spain, July 21-26, 2002.

B. Bhikkaji and T. Söderström: Bias and variance of the parameter estimates for a one dimensional diffusion system. Proc. 15th IFAC World Congress, Barcelona, Spain, July 21-26, 2002.

E. K. Larsson and T. Söderström: Continuous-time AR parameter estimation by using properties of sampled systems. Proc. 15th IFAC World Congress, Barcelona, Spain, July 21-26, 2002.

M. Simandl, J. Kralovec and T. Söderström: Aspects of point-mass approach to nonlinear state estimation and anticipative grid design. IEEE Transactions on Automatic Control, vol 47, no 4, pp 699-702, April 2002.

T. Söderström: Using system identification for estimating material functions from wave propagation experiments. Invited keynote address, Proc. of 3rd International Conference on Identification in Engineering Systems, Swansea, Wales, April 15-17, 2002.

K. Mahata, T. Söderström,  M. Mossberg, L. Hillström and  S. Mousavi: Identification of complex elastic modulus from flexural wave experiments, Proc. 3rd International Conference on Identification in Engineering Systems, Swansea, Wales, April 15-17, 2002.

T. Söderström and K. Mahata: On instrumental variable and total least squares approaches for identification of noisy systems. International Journal of Control, vol 75, no 6, pp 381-389, April 2002.

E. K. Larsson and T. Söderström: Identification of continuous-time AR processes from unevenly sampled data. Automatica, vol 38, pp 709-718, no 4, April 2002.

T. Söderström: Model validation and model structure determination. Circuits, Systems and Signal Processing (special tutorial issue on System Identification), vol 21, no 1, pp 83-90, 2002.

T. Söderström and P. Stoica: Instrumental variable methods for system identification. Circuits, Systems and Signal Processing (special tutorial issue on System Identification), vol 21, no 1, pp 1-9, 2002.

B. Bhikkaji and T. Söderström: Reduced order models for diffusion systems. International Journal of Control, vol 74, no 15, 1543-1557, 2001.

T. Söderström, M. Sebek, J. Jezek, V. Kucera and D. Henrion: An evaluation of algorithm for computing the covariance function of a multivariable ARMA process. In invited session, European Control Conference, ECC 01,  Porto, Portugal, September 04-07, 2001.

T. Söderström, U. Soverini and K. Mahata: Perspectives on errors-in-variables estimation for dynamic systems. Invited paper for 3rd International Workshop on TLS and Errors-in-Variables Modelling, Leuven, Belgium, August 27-29, 2001.

B. Bhikkaji and T. Söderström: Reduced order models for diffusion systems using singular perturbations. Energy and Buildings, vol 33, pp 769-781, 2001.

M. Mossberg, L. Hillström and T. Söderström: Non-parametric identification of viscoelastic materials from wave propagation experiments. Automatica, vol 37, no 4, pp 511-521, April 2001.

E. Karlsson, T. Söderström and P. Stoica: Computing the Cramer-Rao lower bound for noisy input output systems. Signal Processing, vol 80, no 11, pp 2421-2447, November 2000.

M. Mossberg, L. Hillström  and T. Söderström: Identification of viscoelastic materials. Proc. SYSID 2000, IFAC 12th Symposium on System Identification, Santa Barbara, California, June 21-23, 2000.

U. Soverini and T. Söderström: Identification methods of dynamic systems in presence of input noise Proc. SYSID 2000, IFAC 12th Symposium on System Identification, Santa Barbara, California, June 21-23, 2000.

T. Söderström and S. Remle: Parameter estimation and model approximation for diffusion models. Proc. SYSID 2000, IFAC 12th Symposium on System Identification, Santa Barbara, California, June 21-23, 2000.

E. K. Larsson and T. Söderström: Approaches for identifying continuous-time AR processes from unevenly sampled data.Proc. SYSID 2000, IFAC 12th Symposium on System Identification, Santa Barbara, California, June 21-23, 2000.

T. Söderström and B. Bhikkaji: Reduced order models for diffusion systems via collocation methods. Proc. SYSID 2000, IFAC 12th Symposium on System Identification,Santa Barbara, California, June 21-23, 2000.

T. Söderström: Comments on adaptive IIR filtering with monic normalization. IEEE Transactions on Signal Processing, vol 48, no 3, pp 892--894, March 2000.

T. Söderström and M . Mossberg: Performance evaluation of methods for identifying continuous-time autoregressive processes. Automatica, pp 53--59, vol 36, no 1, January 2000.

H. Fan, T. Söderström, M. Mossberg, B. Carlsson and Y. Zou: Estimation of continuous-time AR process parameters from discrete-time data. IEEE Transactions on Signal Processing, pp 1232-1244, vol 47, no 5, May 1999.

T. Söderström: Comments on 'Identification of closed-loop systems via least-squares method'. International Journal of Adaptive Control and Signal Processing, pp 37-41, vol 13, no 1, February 1999.

T. Söderström, W. X. Zheng and P. Stoica: Comments on 'On a least-squares-based algorithm for identification of stochastic linear systems'. IEEE Transactions on Signal Processing,  pp 1395-1396, vol 47, no 5, May 1999.

T. Söderström: Feedforward, correlated disturbances and identification. Automatica, vol 35,  no 9, pp 1565-1571, September 1999.

M. Mossberg and T. Söderström: System identification by approximating the differentiation operator - accuracy analysis and results. European Control Conference, ECC '99, Karlsruhe, Germany, August 31 - September 3, 1999.

T. Söderström: On the Cramer-Rao lower bound for estimating continuous-time autoregressive parameters. Proc. 14th IFAC World Congress, Beijing, PRC, July 5-9, 1999.

Last updated: 16 June 2004 by Torsten Söderström