Acoustical Direction Finding with Time-Modulated Arrays
AbstractTime-Modulated Linear Arrays (TMLAs) offer useful efficiency savings over conventional phased arrays when applied in parameter estimation applications. The present paper considers the application of TMLAs to acoustic systems and proposes an algorithm for efficiently deriving the arrival angle of a signal. The proposed technique is applied in the frequency domain, where the signal and harmonic content is captured. Using a weighted average method on harmonic amplitudes and their respective main beam angles, it is possible to determine an estimate for the signal’s direction of arrival. The method is demonstrated and evaluated using results from both numerical and practical implementations and performance data is provided. The use of Micro-Electromechanical Systems (MEMS) sensors allows time-modulation techniques to be applied at ultrasonic frequencies. Theoretical predictions for an array of five isotropic elements with half-wavelength spacing and 1000 data samples suggest an accuracy of
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Clark, B.; Flint, J.A. Acoustical Direction Finding with Time-Modulated Arrays. Sensors 2016, 16, 2107.
Clark B, Flint JA. Acoustical Direction Finding with Time-Modulated Arrays. Sensors. 2016; 16(12):2107.Chicago/Turabian Style
Clark, Ben; Flint, James A. 2016. "Acoustical Direction Finding with Time-Modulated Arrays." Sensors 16, no. 12: 2107.
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