Retrospective Cost Adaptive Control: Pole Placement, Frequency Response, and Connections with LQG Control

A vast range of technological systems-from aerospace vehicles to chemical processes to Segways-depend on feedback control. These applications typically rely on a combination of classical and modern control techniques, logic for mode switching, and diagnostics for fault detection to ensure safety and reliability, all of which are validated and verified through simulation and testing. A feedback control system is the quintessential cyberphysical system, in which real-time digital computing elements interact bidirectionally with the full complexity of the real world through noisy transducers and limited communication channels [1]. In many applications, the control system is crucial to safe operation, and the potential benefits of new ideas and techniques for feedback control must be weighed against the risk of unanticipated response and/or failure.