Conflict detection and resolution model for low altitude flights

General aviation has been promoted by Small Aircraft Transportation System (SATS) to broaden air transportation services. Under such development, the National Airspace System (NAS) will change dramatically in congested airspace. In this decade, the unmanned aerial vehicle (UAV) has rapidly growing into civilian applications. Low altitude airspace becomes more crowded. As a result, collision avoidance for low altitude flights will become a serious concern to aviation safety. Varieties of conflict detection and resolution (CD&R) were required under multiple maneuvering dimensions for GA and UAV. This paper focuses on efficient collision avoidance logic for GA and UAV based on ADS-R for NextGen. Heading change of horizontal resolution is more suitable for small GA or UAV flying in low altitude in the proposed CD&R model. Simulations using real ultralight flight data are tested to verify the performance of the proposed CD&R.