- Line-of-sight sound propagation in a random moving medium
Vladimir E. Ostashev, D. Keith Wilson · 2015
In this chapter, we consider line-of-sight sound propagation through a random moving medium. This is relevant, for example, to outdoor sound propagation from elevated sources such as helicopters and airplanes to microphones on the ground. It also occurs in propagation from acoustic sources on the ground (e.g., gun and rifle shots, rocket launches, and explosions) to elevated acoustic sensor arrays, such as those suspended below aerostats or installed on helicopters and unattended aerial vehicles (UAVs). If there is only a single, dominant propagation path, the effect of atmospheric refraction on the signal statistics is often relatively small, and such effects can be determined approximately assuming straight line sound propagation. Acoustic tomography of atmospheric turbulence (section 3.7) is based on measurements of the travel times of signals propagating along straight lines between sources and microphones located above the ground.