Resolution of Point Scatterers by Hard-Limited Synthetic Aperture Radar.
NAVAL RESEARCH LAB WASHINGTON D C
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Image maps of collections of point targets are investigated for hard-limited synthetic aperture radar application. Some aspects of hard-limiting, such as image suppression and spurious image generation, are derived under specialized weak-scatterer assumptions. Also, the effect of random variations of target phases on synthetic aperture resolution are studied. Such phase deviations are used to model random motions of target locations and, as expected, it is found that they hinder ones ability to resolve the targets. Graphical plots of some point-target arrangements are presented to illustrate effects of hard limiting and random phase variations. Numerical calculations are used to verify the approximate weak-scatterer theory and to study more general cases such as problems involving more than one strong target which are not readily solved by analytical means. A simple averaging procedure is devised which predicts many aspects of the more accurate numerical results, and the procedure may perhaps be employed in future investigations of mapping continuum scattering surfaces rather than point scatterers. Author
- Cartography and Aerial Photography
- Active and Passive Radar Detection and Equipment