A high resolution direction-of-arrival algorithm for narrow-band coherent and incoherent sources

A high-resolution algorithm is presented for solving the general multiple-source location problem. The incident energy sources may be a mixture of incoherent, partially coherent, or coherent narrowband plane waves, and the array´s geometry is unrestricted. A procedure is first developed that tests for the presence of coherent sources. If no coherent sources are detected, this procedure provides the azimuth and elevation angles associated with the incident sources. When a subset of the sources are found to be coherent, however, an iterative method is then given for solving a nonlinear relationship that provides the required source azimuth-elevation angle estimates. Simulation results are presented to illustrate the improved performance achieved by this new approach relative to that obtained with MUSIC for incoherent sources and spatial smoothed MUSIC for coherent sources