Direction-of-arrival estimation for a lens-based array

In this paper, we describe a high-resolution direction-of-arrival (DOA) estimation algorithm for the enhancement of a lens-based array system. In such a system, the antenna array is followed by an electromagnetic lens and a bank of power detectors (crystal video receivers). This system can handle sources over a large bandwidth and is capable of detecting pulsed sources that exist for short periods of time. The proposed algorithm operates directly on the power estimates provided by a bank of crystal video receivers (CVRs), yielding accurate DOA estimates for multiple narrowband sources. This approach is most effective when the sources are uncorrelated, and it potentially is capable of operating in environments where the signals are highly correlated. We present computer simulations to demonstrate the improved performance achieved by the algorithm for different source scenarios