Abstract
Acoustic sniper localization algorithms are well established for open field detection; however, these algorithms are less accurate in urban environments due to reverberation and diffraction. Research is being performed to understand the effects of obstructions on shock wave propagation. Barrier attenuation calculations that use Fresnel number to characterize obscurity will be compared to measured attenuation of shock wave frequency components. An artificial building was set up and shock waves from bullets were recorded by microphones with varying degrees of obscurity. The experimental setup allowed for a range of Fresnel numbers between 5 and 11 resulting in attenuation up to 30 dB. Attenuation increased as obscurity and Fresnel number increased up to a threshold. Beyond this point the magnitude of attenuation decreases in both theory and experiment. These data support the relationship between attenuation and microphone obscurity and may provide a means to estimate the amplitude and N‐wave slope of the shock wave prior to obstruction.
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