A modified version of the moment-method is proposed for scattering computations. The approach is based on the assumption that the bodies under test partially differ from known standard models. The numerical computation is developed only for the body parts that exhibit physical and geometrical differences. This can be very useful in several cases, for example, when many partially different scatterers have to be analyzed or when a scatterer may assume different spatial positions whereas a part of the scatterer stays unchanged. The proposed method is described and some considerations are made concerning the offered computational advantages.
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