The Unmanned Aircraft System Traffic Management (UTM) is a “traffic management ecosystem” for uncontrolled operations that is separate from, but complementary to, the Air Traffic Management (ATM). In this scope, the operations’ risk management is crucial to keep a safe integration of this manned and unmanned aircraft into a non-segregated airspace domain. Even more, “Detect and Avoid” functions and approaches must be established while dealing with multiple entities on this complex scenario. This paper provides a brief review of concepts and technological solutions to perfom DAA
functions in the context of the project SIMUA - Safe Integration of Manned and Unmaned Aircrafts in non-Segregated Airspace, in regarding the main methods to be in compliance with the established research questions that scope project.