Simulation of detection and beamforming with acoustical ground sensors

D. Keith Wilson; Brian M. Sadler; Tien Pham

doi:10.1117/12.443525

7 August 2002 Simulation of detection and beamforming with acoustical ground sensors

D. Keith Wilson, Brian M. Sadler, Tien Pham

Proceedings Volume 4743, Unattended Ground Sensor Technologies and Applications IV; (2002) https://doi.org/10.1117/12.443525
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

An interactive platform has been developed for simulating the detection and direction-finding performance of battlefield acoustic ground sensors. The simulations use the Acoustic Battlefield Aid (ABFA) as a computational engine to determine the signal propagation and resulting frequency-domain signal characteristics at the receiving sensor array. There are three components to the propagation predictions: the transmission loss (signal attenuation from target to sensor), signal saturation (degree of signal randomization), and signal coherence across the beamforming array. The transmission loss is predicted with a parabolic solution to the wave equation that accounts for sound refraction and ground interactions; signal saturation and coherence are predicted from the theory for line-of-sight wave propagation through turbulence. Based on these calculations, random frequency-domain signal samples are generated. The signal samples are then mixed with noise and fed to the selected detection or beamforming algorithm. After averaging over a number of trials, results are overlaid on a terrain map to show the sensor coverage. Currently available algorithms include the Neyman-Pearson criterion and Bayes risk minimization for detection, and the conventional, MVDR, and MUSIC beamformers. Users can readily add their own algorithms through a 'plug-in' interface. The interface requires only a text file listing the algorithm parameters and defaults, and a Matlab routine or Windows dynamic link library that implements the algorithm.

Citation Download Citation

D. Keith Wilson, Brian M. Sadler, and Tien Pham "Simulation of detection and beamforming with acoustical ground sensors", Proc. SPIE 4743, Unattended Ground Sensor Technologies and Applications IV, (7 August 2002); https://doi.org/10.1117/12.443525

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