Final Technical Report for ONR Contract N00014-88-K-0172 15 November 1987-14November 1991 (California University, San Diego, La Jolla. Department of Physics)

摘要

In 1987 and 1988, Dan Wurmser (now at NRL) and I developed a new method forscattering from rough surfaces. There were several new results. The first was a new exact formula for the scattering amplitude which manifestly exhibits reciprocity. However, like all exact formulas it is useful only in conjunction with numerical work. On the other hand, this new formulation of the scattering problem lead to an approximate expression for the scattering amplitude which is no more difficult to apply than the Kirchoff approximation and is much more accurate. In fact, this new approximate expression is valid whenever one can argue that a two scale approach makes sense, i.e. when there is small scale roughness superimposed on top of a smooth large scale structure.