Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wave propagation and imaging in moving random media   We present a study of sound wave propagation in a time dependent random
medium and an application to imaging. The medium is modeled by small temporal
and spatial random fluctuations in the wave speed and density, and it moves due
to an ambient flow. We develop a transport theory for the energy density of the
waves, in a forward scattering regime, within a cone (beam) of propagation with
small opening angle. We apply the transport theory to the inverse problem of
estimating a stationary wave source from measurements at a remote array of
receivers. The estimation requires knowledge of the mean velocity of the
ambient flow and the second-order statistics of the random medium. If these are
not known, we show how they may be estimated from additional measurements
gathered at the array, using a few known sources. We also show how the
transport theory can be used to estimate the mean velocity of the medium. If
the array has large aperture and the scattering in the random medium is strong,
this estimate does not depend on the knowledge of the statistics of the random
medium.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin