SARAH is a bistatic (TWIN) satellite synthetic aperture radar (SAR) concept. It will produce global high resolution imagery with ideal characteristics for the sdi mission: all weather, day or night, ground penetrating, accurately registered, and conformal (adjacent map plates fit). It will be more cost effective since it is the only known sar with the attributes needed to fully capitlize on the known advantages of coherent imaging and data management: all weather, day or night, ground penetrating, accurately registered, and conformal (adjacent map plates fit). It will be more cost effective since it is the only known sar with the attributes needed to fully capitalize on the known advantages of coherent imaging and data format. Resolution will be less than a wavelength, and could be as small as 25 centimeters. The imagery can be either 2-d or 3-d. By using a doppler enchanced method to create a zone plate of a hugh area and degrading the range resolution, large power savings can be achieved. Degrading the range resolution permits huge synthetic apertures focusing the visible earth's curved surfce allowing the second dimension from the rotation of the field using a method successfully developed by the air force. Patent rights for sarah are claimed under U.S. Patent application no. 620,911.
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