Grid Restoration Algorithm to Improve PO Calculation Accuracy in GRECO

When calculating RCS using the Graphical Electromagnetic Algorithm (GRECO), Firstly we must obtain the coordinate values and normal vectors of each point on the target illumination surface, which is limited to the computer hardware conditions. So when we calculating RCS at high frequencies often accompanied by insufficient pixel accuracy, therefore it can affect the calculation accuracy. The method of turning straight into a curve adopts a curved surface as close as possible to the real situation instead of the facet information represented by pixels, thereby improving the calculation accuracy of the model at high frequency.