High resolution cross‐sensor beamforming for a billboard array

The cross‐sensor field of an array consists of all products of the narrow‐band quadrature signal measured at one sensor multiplied by the complex conjugate of the quadrature signal measured at a second sensor. Three algorithms which use the cross‐sensor field to determine the level and direction of a set of acoustic waves incident on a billboard array are compared. These are correlation (conventional) beamforming, maximum likelihood estimation, and iterative decomposition.