Multiple Scattering, Space-Time Interferometry, and Imaging in Random Media

建议开展基础研究活动，发展解析、数值和实验相结合的方法来研究波在随机介质中的传播。光、声和微波在随机介质中传播时会经历随机波动，这些波与散射介质之间的相互作用会影响到广泛的传感问题。随机介质在许多材料系统中都是常见的：雪、雾、大气湍流、植被和生物系统。建议的研究具有基础性和一般性。这项研究的重点是发展适用于随机介质中的广义时空干涉和成像的多重散射理论。提出了四个研究领域：(1)随机介质的超宽带散射；(2)角记忆特征和广义极化特征；(3)增强后向散射，重点阐明了体积和表面散射之间的关系，特别是当粒子尺寸在共振区时。(4)随机介质中目标的成像。在上述专题领域内可能存在协同作用。

Basic research activities are proposed to develop analytical combined with numerical and experimental approaches to the study of wave propagation through random media. Optical, acoustical, and micro- waves propagating through random media experience random fluctuations and these interactions between the waves and the scattering media affect a broad range of sensing problems. Random media are common to many materials systems: snow, fog, atmospheric turbulence, vegetation, and biological systems. The proposed research is fundamental in nature and general in applicability. The proposed research focuses on development of multiple scattering theories as applied to generalized space-time interferometry and imaging in random media. Four topic areas are proposed for investigation: (1) Ultra-wideband scattering by random media (2) Angular memory signature and generalized polarization signature (3) Enhanced backscattering with emphasis on clarifying the relationship between volume and surface scattering especially when particle sizes are in the resonant region. and (4) Imaging of objec ts in random media. Possible synergism exists within the above topic areas.