Abstract
Uniform circular arrays are the de facto standard in direction finding thanks to their isotropy, i.e. the ability to measure the source direction with a constant accuracy, regardless of the actual source direction. In practice, sensors are directive and isotropy requires a large number of such sensors. Many systems can only accommodate very small-sized arrays, and hence, performance becomes sensitive to the array orientation w.r.t. the source (expected) direction. We characterize the behavior of such arrays and announce a theoretical result about the Cramer-Rao Bound of uniform circular arrays who are anisotropic because of one or two missing sensors.
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