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Robust image restoration for ground-based space surveillance

机译:基于地面空间监测的鲁棒图像恢复

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Myopic deconvolution from wave front sensing (MDWFS) is a powerful tool for high-resolution imaging. It is typically used with monochromatic, short exposure images with integration times less than the coherence time for the atmosphere, and Shack-Hartmann wave-front sensor data where the number of sub-apertures across the pupil is commensurate with the turbulence strength D/r_0 where D is the diameter of the telescope and r_0 is the spatial coherence length of the atmosphere. However, there are important imaging scenarios that do not fit this model. Imaging faint targets usually requires integration times greater than the atmospheric coherence time and large spectral bandwidths. Observing targets during poor seeing conditions results in D/r_0 values that are significantly greater than the number of sub-apertures across the pupil. In these cases, we may expect that a high fidelity estimate of the object will require an algorithm that accurately models the physical effects of broad temporal and spectral bandwidth in the point-spread function. In this paper we demonstrate the performance of a new MDWFS algorithm, called DORA, designed to work with imagery obtained in strong turbulence conditions. This algorithm includes models of the temporal behavior of the atmosphere and finite spectral bandwidth. It includes several stages of processing, including DWFS and joint estimation via multi-frame blind deconvolution (MFBD). Results based on simulated data show that DORA will provide high-fidelity restorations for imagery acquired through strong turbulence conditions, D/r_0>40. Real-world performance of the new code is established with results from data acquired with the AEOS 3.6 m telescope both with and without adaptive optics compensation.
机译:波前感(MDWFS)的近视碎片卷积是高分辨率成像的强大工具。它通常与单色的短曝光图像一起使用,该图像的积分时间小于大气的相干时间,以及瞳孔穿过瞳孔的子孔的数量与湍流强度D / r_0相称的棚屋的空间波前传感器数据。其中D是望远镜的直径,R_0是大气的空间相干长度。但是,存在重要的成像方案,不适合此模型。成像微弱目标通常需要集成时间大于大气相干时间和大的光谱带宽。在差的观察条件下观察目标导致D / R_0值显着大于瞳孔跨越瞳孔的子孔的数量。在这些情况下,我们可能希望对象的高保真估计将需要一种准确地模拟点扩展功能中广泛时间和光谱带宽的物理效果的算法。在本文中,我们展示了一种新的MDWFS算法的性能,称为DORA,旨在使用在强大的湍流条件下获得的图像。该算法包括大气的时间行为的模型和有限频谱带宽。它包括几个处理阶段,包括通过多帧盲折叠(MFBD)的DWFS和联合估计。基于模拟数据的结果表明,DORA将为通过强大的湍流条件,D / R_0> 40获取的图像提供高保真修复。新代码的实际性能是通过使用AEOS 3.6 M望远镜的数据的结果建立,无论是自适应光学补偿。

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