Adaptive Multiple Snapshot Beamforming for the Rejection of Non Stationary and Coherent Interferers

Abstract

In beamforming applications, the degrees of freedom or the maximum number of signals allowed in the system, is an important number that will decide the number of sensors and hardware components required to achieve the desired performance. A flexible algorithm that allows us to control this number depenhng on the environment in which it operates is presented. The maximum degrees of freedom for an N element array is N - 1 for the incoherent case and (N-l)/2 for the fully coherent case. The most noticeable feature in this algorithm is that it can be implemented in real time since the updating of the weight equation involves only a rank one update each time a new snapshot arrives.