A major issue in the field of penetrating friendly civil airspace with military used unmanned aerial vehicles is the reliability of the situational awareness for the vehicle and its controlling mechanism. After leaving restricted flight areas the unmanned aerial vehicle has to be assimilated to the standards of civil air traffic. Therefore the reliability of the unmanned system with its interfaces towards ground stations, satellites, airborne platforms or internal sensors and back up systems has to be evaluated and assured. In terms of sensor fusing and position determination and in case of degraded primary guidance signals the potential of fuzzy logic based decision and evaluation methods is shown.
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