Simultaneous grating lobe and backlobe rejection with a line array of vector sensors

Horizontal line arrays in underwater acoustics have a so-called ¿left / right¿ ambiguity due to the conical shape of the beampattern. When operated above the design frequency at which the inter-element spacing is one-half wavelength, a conical grating lobe further complicates array response. It is shown how vector sensors can be used to simultaneously discriminate against grating lobe and backlobe arrivals by using both the axial and cross-axial dipole components. Results with adaptive algorithms of varying complexity and new deterministic algorithms are compared.