RADAR ANALYSIS OF THE MOON. PHASE II: SURFACE PROPERTIES.
TEXAS INSTRUMENTS INC DALLAS
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Utilization of radar in determining specific properties of the lunar surface is dependent upon a successful separation of the surface geometry and electromagnetic components of radar return from the lunar surface and b interpretation of the obtained electromagnetic property values in terms of other properties such as density, grain size, mineral content, and chemical composition. Careful evaluation of the relevant diffraction theory for describing radar return from an arbitrary terrain clearly shows a the inherent ambiguity between geometrical and electromagnetic contributions and b the deficiencies of the frequently used Huygens-Kirchoff theorem. A method for factorizing the geometrical and electromagnetic contributions is demonstrated - under the proviso that a separation between surface texture and gross terrain configuration is permissible. In the developed method, fundamental problems are included within, and restricted to, the conventional antenna function - a function amenable to measuring using models. A study was made to determine the extent to which the electromagnetic properties of terrestrial materials having possible lunar surface counterparts are influenced by physical state e.g., crystalline structure, density, grain size and shape, mineral and chemical composition and testing conditions e.g., temperature, pressure and radar f9equency. Author