Maximum Constrained Directivity of Oversteered End-Fire Sensor Arrays
AbstractFor linear arrays with fixed steering and an inter-element spacing smaller than one half of the wavelength, end-fire steering of a data-independent beamformer offers better directivity than broadside steering. The introduction of a lower bound on the white noise gain ensures the necessary robustness against random array errors and sensor mismatches. However, the optimum broadside performance can be obtained using a simple processing architecture, whereas the optimum end-fire performance requires a more complicated system (because complex weight coefficients are needed). In this paper, we reconsider the oversteering technique as a possible way to simplify the processing architecture of equally spaced end-fire arrays. We propose a method for computing the amount of oversteering and the related real-valued weight vector that allows the constrained directivity to be maximized for a given inter-element spacing. Moreover, we verify that the maximized oversteering performance is very close to the optimum end-fire performance. We conclude that optimized oversteering is a viable method for designing end-fire arrays that have better constrained directivity than broadside arrays but with a similar implementation complexity. A numerical simulation is used to perform a statistical analysis, which confirms that the maximized oversteering performance is robust against sensor mismatches. View Full-Text
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Trucco, A.; Traverso, F.; Crocco, M. Maximum Constrained Directivity of Oversteered End-Fire Sensor Arrays. Sensors 2015, 15, 13477-13502.
Trucco A, Traverso F, Crocco M. Maximum Constrained Directivity of Oversteered End-Fire Sensor Arrays. Sensors. 2015; 15(6):13477-13502.Chicago/Turabian Style
Trucco, Andrea; Traverso, Federico; Crocco, Marco. 2015. "Maximum Constrained Directivity of Oversteered End-Fire Sensor Arrays." Sensors 15, no. 6: 13477-13502.