A brief introduction stating what Kalman/Bayesian filters are and what they can be used for in the real world would be good for the start of the book. In your

A brief introduction stating what Kalman/Bayesian filters are and what they can be used for in the real world would be good for the start of the book. In your Preface/Motivation section, you currently mention Kalman filters (4 times in the 1st 4 sentences) without explaining what it is and that seems to be the only intro to the topic.