Space-Time Correlation Imaging of Objects in Random Media

许多天然的和人造的媒介在空间和时间上随机变化，被称为“随机媒介”。例如大气湍流、海浪、雨、雾、雪、植被、地形、生物介质和无序介质。通过这些介质传播的光、声波和微波经历随机波动，波与随机介质之间的这些相互作用影响到广泛的实际问题，例如物体的探测、识别和成像、介质的遥感以及通过这种介质的通信。在这个项目中，PI的重点是理论的发展，以处理涉及确定性对象和随机介质的现实问题，而不是理想的均匀随机介质。实际应用包括成像包括环境成像、医学成像和对地下物体的传感。PI强调发展广义时空相关技术、极化相关和随机格林函数来探测和成像随机介质中的目标。要研究的具体课题包括(1)随机介质中成像的广义时空相关技术，(2)超宽带矢量辐射传输，(3)粗糙表面附近的源和物体以及对象-介质相互作用，以及(4)在材料和技术开发中的应用。他们计划继续强调人力资源开发和对毕业生和本科生在所有三个领域的培训：分析、数字和实验。这项工作是针对物理和生物介质中目标的成像和遥感理论的发展及其在医学光学、超声成像、雷达和激光雷达、遥感和逆散射理论中的应用的基础研究。

9908849IshimaruMany natural and man-made media vary randomly in space and time and arecalled "random media." Examples are atmospheric turbulence, ocean waves,rain, fog, snow, vegetation, terrain, biological media, and disorderedmedia. Optical and acoustical waves and microwaves propagating throughthese media experience random fluctuations, and these interactions betweenthe waves and the random media affect a broad range of practical problemssuch as detection, identification and imaging of objects, remote sensing ofmedia, and communications through such media. In this project, The PI'semphasize the development of theories to deal with realistic problems whichinvolve both deterministic objects and random media, rather than idealhomogeneous random media. Practical applications include imaging inclutter environment, medical imaging, and sensing of buried objects. The PI'sstress the development of generalized space-time correlation techniques,polarization correlations, and stochastic Green's functions for the purposeof detection and imaging of objects in random media. Specific topics to beinvestigated include (1) Generalized space-time correlation techniques forimaging in random media, (2) Ultra-wideband vector radiative transfer, (3)Sources and objects near rough surfaces and object-medium interactions and(4) Applications to development of materials and techniques. They plan tocontinue to emphasize human resource development and training of graduateand undergraduate students in all three areas: analytical, numerical andexperimental. This work is directed to the basic research on thedevelopment of theories of imaging and remote sensing of objects ingeophysical and biological media and applications to medical optics,ultrasound imaging, radars and lidars, remote sensing, and inversescattering theories.***