Array Shading to Maximize Deflection Coefficient for Broadband Signal Detection with Conventional Beamforming

Authors

Kaushallya Adhikari, University of Rhode Island
Blaine M. Harker, Naval Undersea Warfare Center Division Newport
Thomas A. Wettergren, Naval Undersea Warfare Center Division Newport
Lauren A. Freeman, Naval Undersea Warfare Center Division Newport
Simon E. Freeman, Naval Undersea Warfare Center Division Newport

Document Type

Article

Date of Original Version

1-1-2021

Abstract

This paper develops and applies a numerical optimization procedure to compute broadband noise-adaptive weights for delay and sum beamforming that are conditioned to maximize the deflection coefficient at the output of a square law detector for a given set of underwater pressure measurements. The resulting optimal weights mitigate the effects of noise and interferers and maximize signal detection. Comparison of the optimal weights with minimum variance distortionless response weights show that the presented algorithm provides higher attenuation of interferers. We also use the noise-adaptive algorithm to find the optimal sparse array geometry for a given number of sensors and aperture. Comparison of the resulting optimal array with coprime, nested, and semi-coprime arrays shows that the proposed sparse array suppresses interferers more than the other sparse arrays.

Publication Title, e.g., Journal

IEEE Access

Volume

9

Citation/Publisher Attribution

Adhikari, Kaushallya, Blaine M. Harker, Thomas A. Wettergren, Lauren A. Freeman, and Simon E. Freeman. "Array Shading to Maximize Deflection Coefficient for Broadband Signal Detection with Conventional Beamforming." IEEE Access 9, (2021). doi: 10.1109/ACCESS.2021.3083203.