Imaging through the atmosphere is an important technology area, with applications in fields such as astronomy and remote sensing. For optimal results, many facets of signal collection and recovery must be understood. These facets include understanding relevant atmospheric effects, optimizing the signal collection system, and effectively processing the collected signals to obtain the desired imagery. Many different types of radiation can be used to obtain images through the atmosphere, including microwave, infrared, and optical. This radiation can be supplied by the object or natural sources (passive illumination), or it can be provided by the user (active illumination). This focus issue contains a number of invited papers describing imaging work being accomplished in the Advanced Optics and Imaging Division of the Air Force Research Laboratory, formerly the Optical Sensing Division of the Air Force Phillips Laboratory. These papers assume that optical or infrared radiation is being used, either actively or passively.
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