Paul S. Idell and David G. Voelz
One of the maxims of high resolution imaging, especially for military surveillance applications, appears to be that the sensors you have on hand never quite deliver the image detail you really need. The reasons for this are manifold, but the factors fundamentally limiting image resolution in optical sensors can usually be attributed to limits in sensor fabrication technology, vagaries of the sensor operating environment, and insufficient signal energy with which to form the image.
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