FINITE-TIME PERFORMANCE OF A QUADRATICALLY CONSTRAINED MVDR BEAMFORMER

The finite-time behavior of a quadratically constrained version of the minimum-variance, distortionless-response line-array beamformer is ex amined. An entity known as the weight ratio is defined and it is demon strated that there are simple expressions that relate the weight ratio to the field scenario which explicitly take into account the finite-t ime misadjustment phenomenon. It is further demonstrated that holding the weight ratio to a value of about 0.5 produces an adaptive beamform er with a beneficial combination of robustness to nonideal situations (e.g., sensor misalignment, pointing errors, correlated interferers, m isadjustment effects, etc.) while retaining the ability to adapt-quick ly in highly dynamic fields.