Adaptive-Adaptive Narrowband Subarray Beamforming
NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV NEW LONDON CT NEW LONDON DETACHMENT
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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, Abraham and Owsley have introduced a two-stage beamformer -- conventional first-stage, adaptive second-stage -- which gives near full adaptive resolution. This beamformer, however, can produce spatial aliases, or false alarms, in the presence of dominant interferers. This memorandum introduces an adaptive-adaptive beamformer which does not produce false alarms, while maintaining near full adaptive resolution and low computational cost.
- Radiofrequency Wave Propagation