Measurement of impulse noise propagation over natural impedance surfaces

Abstract

The peak sound pressure level decay with distance of the impulse noise from hand grenade simulators has been measured over the following types of surfaces: water, swamp, rocky ground with small bushes, dead grass with sparse snow cover, and dense evergreen forest. The ground impedance is estimated for each surface using the calculation of R. Raspet. H. E. Bass, and J. Ezell [J. Acoust. Soc. Am. 74, 267–1274 (1983)] and predictions of the effect of each type of ground on lower frequency pulses are estimated.