state observer
system that provides an estimate of the internal state of a given real system, from measurements of the input and output of the real system
en-US/ˈsteɪt əbˈzɝvɚ/
en-GB/ˈsteɪt ɒbˈzɜːvə/
system that provides an estimate of the internal state of a given real system, from measurements of the input and output of the real system