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Radar Contrast Patterns of Airport Runways

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Abstract

The radar contrast of a perfectly absorbing gap surrounded by reflecting semi-infinite half-planes has been derived as a special example of a theory giving the radar contrast of any extended target complex. The radar contrast is defined in terms of the power received at the antenna and does not take into account the effects of noise. By comparing the contrast of an absorbing gap with that obtained for two point sources of angular separation equal to the width of the gap, an explanation is given of the unexpectedly good results obtained by side-looking reconnaissance radars in resolving airport runways of angular widths as small as one-fifth that of a half-power beam width.

© 1962 Optical Society of America

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