Journal
IEEE SENSORS JOURNAL
Volume 21, Issue 2, Pages 2211-2218Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.3021588
Keywords
Sensor arrays; Microphone arrays; Manifolds; Legged locomotion; Array signal processing; cardioid sensors; Cramé r-Rao bound; direction of arrival; L-shaped array; V-shaped array
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The study compared the direction finding performance of L-shaped and V-shaped arrays of first-order cardioid microphones, finding that the L-shaped array generally outperforms the V-shaped array in more regions, with higher variance ratios favoring the V-shaped array in certain areas.
The L-shaped and V-shaped arrays of first-order cardioid microphones for direction finding are presented in this paper. A comparative study of the direction of arrival estimation performance of the arrays was carried out by analytically deriving, in closed-form, and comparing the Cramer-Rao bounds of an incident signal's direction-of-arrival (DoA) azimuth and polar angles for these arrays. The maximum-likelihood estimator is used to verify the correctness of derived bounds. This investigation reveals that for direction finding, the L-shaped array of cardioid microphones would generally outperform the V-shaped array of cardioid microphones in more sub-regions of the DoA polar-azimuth angle space. However, in regions where the V-shaped array of cardioid microphones outperforms the L-shaped array of cardioid microphone, the variance ratios are usually higher in favor of the V-shaped array.
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