Adaptive-adaptive subarray narrowband beamforming

A two-stage adaptive narrowband beamformer is introduced. Adaptive beamformers give high-resolution angle-of-arrival estimates, but at considerable computational cost. To reduce the computational cost, N. Owsley and D. Abraham (1989) have introduced a two-stage beamformer-conventional first-stage, adaptive second-stage-which gives near full adaptive resolution. This beamformer, however, can produce false alarms in the presence of dominant interferers. The authors present an adaptive-adaptive beamformer, which does not produce false alarms, while maintaining near full adaptive resolution and low computational cost. A comparison of computational cost for the adaptive-adaptive and conventional-adaptive beamformers is also given.<>