The broad-band Wiener solution for Griffiths-Jim beamformers

The authors treat the problem of finding the Wiener filters for a wideband adaptive beamformer. Explicit expressions are given for the filters and error power spectrum in the frequency domain. The expressions are simple to program and give the possibility of investigating superresolution for wideband signals and of determining sufficient lengths of the finite-impulse-response filters in adaptive arrays. The major results are an analytical expression for the broadband array Wiener solution given for an arbitrary spectrum for target, interference, and noise and an approximate analytic expression for the angular 3-dB beamwidth for broadband signals