Discussion
Which aperture error produces a beam steered away from boresight?
Answer: A
A linear phase gradient is exactly what a phased array applies deliberately to steer its beam, so an accidental one produces the same result. Quadratic error broadens, random error raises the side lobe floor, and a symmetric amplitude taper widens the beam and lowers the side lobes without moving it. Classifying aperture errors by their order in position, and knowing the pattern signature of each, turns pattern measurement into a diagnostic tool.
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