Dr. David R. Bergman Profile

Dr. David R. Bergman

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Proceedings Article | 20 May 2015 Paper

Phased array beamformer performance in variable environments

David Bergman

Proceedings Volume 9464, 94640X (2015) https://doi.org/10.1117/12.2176951

KEYWORDS: Phased arrays, Acoustics, Sensors, Wavefronts, Atmospheric propagation, Radio propagation, Wave propagation, Waveguides, Refractive index, Receivers

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Beamforming techniques are used to locate sources and scattering centers from data acquired by either passive or active phased arrays. The technique has a wide variety of applications from far field source location and tracking to near field imaging. The presence of inhomogeneities in the environment will have an effect on the propagation of the field. This in turn will change the results of a beamformer prediction. Using simulated sources and environments one can systematically study the effect of the atmosphere on the angle of arrival as seen by the array. From these studies attempts at systematic corrections can be tested to evaluate their fidelity in a real system. We present the results of a series of studies on an acoustic field in the presence of sound speed fluctuation and steady wind profiles and demonstrate how various terms in the environment contribute to changes in beamformer processing results.

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