Research on Technology for Separating ADS-B Overlapped Signals

Automatic Dependent Surveillance-Broadcast (ADS-B) is an International Civil Aviation Organization (ICAO) formally identified and promoted mainstream surveillance methods of the future. However, the increasing airspace traffic density makes overlapping a serious problem. In order to separate the overlapped ADS-B signals in time domain, orthogonal projection algorithms are carried out for different antenna situations. Firstly, Singular Value Decomposition (SVD) is used to determine the position of overlapped signals. Then, for antenna arrays, Projection Algorithm (PA) is used to separate the overlapped signals. For single antenna, Projection Algorithm Single Antenna (PASA) is used. Last, the separated signals are compared and verified.