Navigation (Nav) refers to the question ”where is currently the vehicle?”. A Navigation System (NS) aims at giving you your position. Nowadays the main sensor associated to navigation is definitely a GPS (Global Positioning System) sensor. More generally the Nav collects all the data from the sensors and processes them to make a precise, smooth and high frequency information about position and speed.
The main control theory tool for navigation is probably the Kalman filter. Typically, embedded on board an aircraft, the navigation will combine GPS data, air data, inertial data and the aircraft dynamical model into a Kalman filter.
Next chapter will be about Stability and Control.
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