State estimation of continuous-time systems with implicit outputs from discrete noisy time-delayed measurements

• Type: Article in International Conference Proceedings Book
• Date: 2006

Authors

Pedro P Aguiar (Author) Other; Joao P Hespanha (Author) Other

Conference proceedings International

Title: PROCEEDINGS OF THE 45TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-14

Pages: 4781-4786

45th IEEE Conference on Decision and Control

San Diego, CA, DEC 13-15, 2006

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

Other information

Authenticus ID: P-004-QKJ

DOI: 10.1109/cdc.2006.377083

Abstract (EN): We address the state estimation of a class of continuous-time systems with implicit outputs, whose measurements arrive at discrete-time instants, are time-delayed, noisy, and may not be complete. The estimation problem is formulated in the deterministic H,,. filtering setting by computing the value of the state that minimizes the induced L-2-gain from disturbances and noise to estimation error, while remaining compatible with the past observations. To avoid weighting the distant past as much as the present, a forgetting factor is also introduced. We show that, under appropriate observability assumptions, the optimal estimate converges globally asymptotically to the true value of the state in the absence of noise and disturbance. In the presence of noise, the estimate converges to a neighborhood of the true value of the state. The estimation of position and attitude of an autonomous vehicle using measurements from an inertial measurement unit (IMU) and a monocular charged-coupled-device (CCD) camera attached to the vehicle illustrates these results. In the context of this application, the estimator can deal directly with the usual problems associated with vision systems such as noise, latency and intermittency of observations.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6