It is expected that unmanned aerial vehicles will become a driving force in the markets from a technological and economic point of view in different sectors. Applications with increased levels of automation and no line of sight require reliable collision avoidance technologies to ensure safety in flight. Currently, no commercial aviation-enabled collision avoidance systems are available for reliable detection of non-cooperative obstacles. There is therefore a considerable risk of collisions. The focus of this project is the investigation of methods and procedures of electro-optical, thermal-infrared and radar sensors and their data fusion for the reliable detection of potential conflicts, collision avoidance strategies as well as the integration and evaluation of the technology in an aircraft of the EASA CS23 category.