abstract:Detect and avoid (DAA) is a set of technologies designed to avoid interference between a given emitter and the wireless environment. Its need was generated by the Ultra-wideband (UWB) standard that uses a fairly large spectrum to emit its pulses.
Most civil aviation authorities will only allow larger, longer-range UAVs into civilian "non-segregated" airspace once they have demonstrated "detect andavoid" capabilities that make collisions almost impossible.