Angular Spectral Plane-Wave Expansion of Nonstationary Random Fields in Stochastic Mode-Stirred Reverberation Processes
Abstract
We derive an integral expression for the plane-wave expansion of the time-varying (nonstationary) random field inside a mode-stirred reverberation chamber. It is shown that this expansion is a so-called oscillatory process, whose kernel can be expressed explicitly in closed form. The effect of nonstationarity is a modulation of the spectral field on a time scale that is a function of the cavity relaxation time. It is also shown how the contribution by a nonzero initial value of the field can be incorporated into the expansion. The results are extended to a special class of second-order processes, relevant to the perception of a mode-stirred reverberation field by a device under test with a first-order (relaxation-type) frequency response.
Keywords
Cite
@article{arxiv.1004.2268,
title = {Angular Spectral Plane-Wave Expansion of Nonstationary Random Fields in Stochastic Mode-Stirred Reverberation Processes},
author = {Luk R. Arnaut},
journal= {arXiv preprint arXiv:1004.2268},
year = {2015}
}
Comments
22 pages, 3 figures, accepted for publication in Phys. Rev. E