Antenna Array Design for Angle of Arrival Accuracy

The patent transitions from using only phase difference information (one-dimensional measurement) to incorporating both phase difference and signal amplitude/energy information (adding another dimension). By evaluating multiple possible angle hypotheses and comparing their likelihoods based on both phase correlation and signal strength, the system resolves the cyclical ambiguity inherent in phase-only measurements.

The patent changes the evaluation parameters from relying solely on phase correlation to using a composite metric that includes both phase difference correlation and signal amplitude/energy. This parameter change allows the system to distinguish between correct and incorrect angle hypotheses, as the correct angle will exhibit both phase consistency and appropriate signal strength characteristics.

The patent converts the harmful effect of multipath signals into a beneficial one by using the iterative hypothesis testing approach. Instead of treating multipath-induced phase errors as pure noise, the system generates multiple angle hypotheses and uses signal amplitude/energy information to evaluate their likelihoods. The correct direct-path angle will consistently show higher likelihood despite multipath interference, allowing the system to extract accurate angle information even in challenging environments.

The patent implements a feedback mechanism through iterative evaluation of angle hypotheses. Each hypothesis is tested by comparing predicted phase differences with actual measurements, and the likelihood assessment provides feedback that guides the selection of the most probable angle. This feedback loop allows the system to converge on the correct angle of arrival even when multipath signals are present.