A Comparison of Error Estimators for the Method of Moments

Local error estimators are investigated for use with numerical solutions of the electric field integral equation. Three-dimensional test targets include a sphere, disk, NASA almond, and a Lockheed Martin Expedite aircraft model. Visual plots and correlation coefficients are used to assess the accuracy of the estimators. It is shown that the inexpensive discontinuity estimators are usually as accurate as the residual estimators.