Online model

An online model is a mathematical model which tracks and mirrors a plant or process in real-time, and which is implemented with some form of automatic adaptivity to compensate for model degradation over time. An online model is a mathematical model which tracks and mirrors a plant or process in real-time, and which is implemented with some form of automatic adaptivity to compensate for model degradation over time. An online model is also sometimes referred to as an 'online simulator' or 'online system'. An online model is related to the concept of real-time simulation, as an online model runs in real-time by definition. Conversely, a real-time simulation is not necessarily an online model as it by definition does not require adaptivity in either states or parameters.