In order to precisely control fixed wing aircraft you need to know the Angle of Attack (AoA) and Angle of Sideslip (AoS).

Unfortunately these sensors are often unreliable (As in the case of Boeing 737-Max) or too bulk for small UAVs. Our synthetic air data system provides estimates of AoA and AoS which can serve as a backup (for large craft) in case the primary sensor fails, or they can be used standalone for small UAVs