Abstract
This paper proposes an efficient algorithm for analyzing electrically large targets after partial modification. After solving the original model using the characteristic basis function method (CBFM), the mesh modification algorithm (MMA) is employed to modify the mesh according to requirements. Subsequently, in the CBFM blocks, only the characteristic basis functions (CBFs) associated with the affected blocks need to be regenerated, and the corresponding data in the reduced matrix are updated to rapidly obtain the solution of the new model by using the partial modification algorithm (PMA). Numerical examples validate the accuracy and efficiency of the proposed method, demonstrating its potential for practical engineering applications.