Multiple source resolution for true time delay beam-space processing

The authors examine a technique to apply coherent signal subspace processing in the beam-space of a bank of true time delay beamformers. The technique is shown to be capable of resolving closely spaced sources while being inherently wideband in nature, computationally less expensive than many previous wideband coherent integration techniques, and does not rely on a preliminary angle of arrival estimate. The technique is examined for performance with various levels of noise in the system compared to previous methods and the Cramer-Rao theoretical performance bound.