Abstract
The frequency band in which a uniformly spaced linear array can operate is limited by the temporal and spatial
sampling rates. The spatial equivalent of the temporal Nyquist frequency is the spatial design frequency, which
is determined by the array element spacing. Processing above the spatial design frequency incurs the penalty
of grating lobes in the array beampattern due to spatial aliasing, in which signal energy at one angle appears
incorrectly at another angle, possibly obscuring other signals.