As soon as we (AS and PS) completed writing the book on H Optimal Con- 2 trol, another task of equal magnitude was laid to our charge. This task was to work on ?ltering and related topics. This book releases us from this charge. In this endeavor, we are fortunate to have found a capable person in our friend and colleague (AAS) who helped us release our burden. The subject of ?ltering is indeed vast and immense, much more so than the subject of H Optimal Control. In this work, we have tried to present what we 2 believe to be the fundamental issues of ?ltering. The book is not intended to give a chronological development of ?ltering from a historical point of view. A vast number of books already do so. Our intent here is to develop from our perspective the complete theory of ?ltering and various design methodologies associated with it along with their practical implementations. In this respect, we present here a state-of-the-art view of exact and almost input-decoupled ?ltering, H ,and H 2 1 ?ltering and inverse ?ltering issues, and include an application of ?ltering and inverse ?ltering to fault detection, isolation, and estimation. Most of the work reported here arose out of the research conducted by one or more of us and so- times in collaboration with our students and colleagues. Supposedly, young F.

From the reviews:

The book can be recommended to graduate students and researchers in filtering, signal processing and control. –Zentralblatt Math

"This book is about filtering of white noise and finite energy type signals for finite-dimensional linear time-invariant system models. … This book is written for a mathematically mature reader with background in state space, geometric theory and filtering at least at the first year graduate level in engineering or applied mathematics." (Edwin Engin Yaz, Mathematical Reviews, Issue 2007 j)

"This book presents a comprehensive study of filtering theory from an essentially structural perspective. … this book appears particularly suited to scholars, scientists, and researchers. … the authors also address graduate students and practicing engineers." (Elena Zattoni, International Journal of Robust and Nonlinear Control, Vol. 19, 2009)